TY  - CONF
AU  - Cvijović-Alagić, Ivana
AU  - Laketić, Slađana
AU  - Momčilović, M.
AU  - Ciganović, Jovan
AU  - Veljović, Đorđe
AU  - Bajat, Jelena
AU  - Kojić, Vesna
AU  - Rakin, Marko
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11343
AB  - Modern hard tissue replacements, used in orthopedic and dental surgery, are most commonly produced using commercially pure titanium (CP-Ti) and the (α+β) Ti-based alloys since their biomechanical compatibility is superior in comparison to other metallic biomaterials. However, these materials are still unable to meet all implantation requirements primarily due to their somewhat limited resistance to degradation in harsh bio-environment and/or presence of cytotoxic elements in their composition that can cause adverse health effects. Therefore, the potential biomedical application of the β-type Ti alloys, which contain non-toxic elements, is considered since these alloys can exhibit lower elastic modulus and improved biocompatibility compared with other Ti-based materials. The β-type Ti-45Nb (wt%) alloy shows significant potential for application as hard tissue implant material. Nevertheless, an additional improvement of its response in the bio-environment is necessary to maximize its medical applicability. Modification of the alloy’s microstructural and surface characteristics through the careful selection of the appropriate processing parameters can ensure the obtainment of favorable alloy biocompatible properties. High-pressure torsion (HPT), as a processing method for the obtainment of ultra-fine grained (UFG) microstructure with higher compatibility with biological systems, and laser surface scanning, as an easy-to-apply surface modification technique for the obtainment of developed bio-active surface, are singled-out as potential methods for the attainment of more durable orthopedic and dental implants. Having all this in mind, the present research aimed to attain improved corrosive and biocompatible response of the Ti-45Nb alloy in simulated physiological conditions through the alloy grain refinement and the formation of protective surface scales by the alloy combined HPT and laser irradiation processing. For that purpose, the alloy microstructural, electrochemical, and in vitro testing were conducted before and after its additional processing. Attained results indicated that the achieved grain size reduction from 2.76 µm to ~200 nm during HPT processing and the appearance of laser-induced morphologically altered and highly oxidized surface led to the significant improvement of the alloy corrosion resistance and the cellsimplant interaction. Moreover, an additional increase of the laser pulse energy from 5 mJ to 15 mJ during the alloy irradiation in air led to an increase in oxygen content at the alloy surface from 13.64% to 23.89% accompanied by an increase of cell viability from excellent 127.18% to superior 134.42%. Furthermore, as a result of the controlled alloy microstructural and surface morphological and chemical modifications, the formation of a thick, compact and protective bi-modal external scale, composed of mixed Ti- and Nboxides, was enabled in the simulated body conditions. Presence of this surface oxide scale, which consists of inner barrier and outer porous layer, enhanced the alloy’s resistance to corrosion deterioration and simultaneously boosted the cell viability and proliferation. Results of the present study showed that the additional HPT and laser surface processing can be successfully utilized to improve the biometallic’s response to a bio-environment
PB  - Slovak Republic : Institute of Inorganic Chemistry, SAS
C3  - EngCer 2023 : The Advanced Research Workshop: Engineering Ceramics
T1  - Laser-modified Ti-45Nb alloy’s response to bio-environment
SP  - 12
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11343
ER  - 

@conference{
author = "Cvijović-Alagić, Ivana and Laketić, Slađana and Momčilović, M. and Ciganović, Jovan and Veljović, Đorđe and Bajat, Jelena and Kojić, Vesna and Rakin, Marko",
year = "2023",
abstract = "Modern hard tissue replacements, used in orthopedic and dental surgery, are most commonly produced using commercially pure titanium (CP-Ti) and the (α+β) Ti-based alloys since their biomechanical compatibility is superior in comparison to other metallic biomaterials. However, these materials are still unable to meet all implantation requirements primarily due to their somewhat limited resistance to degradation in harsh bio-environment and/or presence of cytotoxic elements in their composition that can cause adverse health effects. Therefore, the potential biomedical application of the β-type Ti alloys, which contain non-toxic elements, is considered since these alloys can exhibit lower elastic modulus and improved biocompatibility compared with other Ti-based materials. The β-type Ti-45Nb (wt%) alloy shows significant potential for application as hard tissue implant material. Nevertheless, an additional improvement of its response in the bio-environment is necessary to maximize its medical applicability. Modification of the alloy’s microstructural and surface characteristics through the careful selection of the appropriate processing parameters can ensure the obtainment of favorable alloy biocompatible properties. High-pressure torsion (HPT), as a processing method for the obtainment of ultra-fine grained (UFG) microstructure with higher compatibility with biological systems, and laser surface scanning, as an easy-to-apply surface modification technique for the obtainment of developed bio-active surface, are singled-out as potential methods for the attainment of more durable orthopedic and dental implants. Having all this in mind, the present research aimed to attain improved corrosive and biocompatible response of the Ti-45Nb alloy in simulated physiological conditions through the alloy grain refinement and the formation of protective surface scales by the alloy combined HPT and laser irradiation processing. For that purpose, the alloy microstructural, electrochemical, and in vitro testing were conducted before and after its additional processing. Attained results indicated that the achieved grain size reduction from 2.76 µm to ~200 nm during HPT processing and the appearance of laser-induced morphologically altered and highly oxidized surface led to the significant improvement of the alloy corrosion resistance and the cellsimplant interaction. Moreover, an additional increase of the laser pulse energy from 5 mJ to 15 mJ during the alloy irradiation in air led to an increase in oxygen content at the alloy surface from 13.64% to 23.89% accompanied by an increase of cell viability from excellent 127.18% to superior 134.42%. Furthermore, as a result of the controlled alloy microstructural and surface morphological and chemical modifications, the formation of a thick, compact and protective bi-modal external scale, composed of mixed Ti- and Nboxides, was enabled in the simulated body conditions. Presence of this surface oxide scale, which consists of inner barrier and outer porous layer, enhanced the alloy’s resistance to corrosion deterioration and simultaneously boosted the cell viability and proliferation. Results of the present study showed that the additional HPT and laser surface processing can be successfully utilized to improve the biometallic’s response to a bio-environment",
publisher = "Slovak Republic : Institute of Inorganic Chemistry, SAS",
journal = "EngCer 2023 : The Advanced Research Workshop: Engineering Ceramics",
title = "Laser-modified Ti-45Nb alloy’s response to bio-environment",
pages = "12",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11343"
}

Cvijović-Alagić, I., Laketić, S., Momčilović, M., Ciganović, J., Veljović, Đ., Bajat, J., Kojić, V.,& Rakin, M.. (2023). Laser-modified Ti-45Nb alloy’s response to bio-environment. in EngCer 2023 : The Advanced Research Workshop: Engineering Ceramics
Slovak Republic : Institute of Inorganic Chemistry, SAS., 12.
https://hdl.handle.net/21.15107/rcub_vinar_11343

Cvijović-Alagić I, Laketić S, Momčilović M, Ciganović J, Veljović Đ, Bajat J, Kojić V, Rakin M. Laser-modified Ti-45Nb alloy’s response to bio-environment. in EngCer 2023 : The Advanced Research Workshop: Engineering Ceramics. 2023;:12.
https://hdl.handle.net/21.15107/rcub_vinar_11343 .

Cvijović-Alagić, Ivana, Laketić, Slađana, Momčilović, M., Ciganović, Jovan, Veljović, Đorđe, Bajat, Jelena, Kojić, Vesna, Rakin, Marko, "Laser-modified Ti-45Nb alloy’s response to bio-environment" in EngCer 2023 : The Advanced Research Workshop: Engineering Ceramics (2023):12,
https://hdl.handle.net/21.15107/rcub_vinar_11343 .

TY  - CONF
AU  - Cvijović-Alagić, Ivana
AU  - Laketić, Slađana
AU  - Veljović, Đorđe
AU  - Kojić, Vesna
AU  - Bajat, Jelena
AU  - Rakin, Marko
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11344
C3  - NANOSTRUC 2023 : International Conference on Structural Nano Composites
T1  - Ultrafine-grained microstructure effect on the biomedical Ti-based alloy performance
SP  - 31
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11344
ER  - 

@conference{
author = "Cvijović-Alagić, Ivana and Laketić, Slađana and Veljović, Đorđe and Kojić, Vesna and Bajat, Jelena and Rakin, Marko",
year = "2023",
journal = "NANOSTRUC 2023 : International Conference on Structural Nano Composites",
title = "Ultrafine-grained microstructure effect on the biomedical Ti-based alloy performance",
pages = "31",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11344"
}

Cvijović-Alagić, I., Laketić, S., Veljović, Đ., Kojić, V., Bajat, J.,& Rakin, M.. (2023). Ultrafine-grained microstructure effect on the biomedical Ti-based alloy performance. in NANOSTRUC 2023 : International Conference on Structural Nano Composites, 31.
https://hdl.handle.net/21.15107/rcub_vinar_11344

Cvijović-Alagić I, Laketić S, Veljović Đ, Kojić V, Bajat J, Rakin M. Ultrafine-grained microstructure effect on the biomedical Ti-based alloy performance. in NANOSTRUC 2023 : International Conference on Structural Nano Composites. 2023;:31.
https://hdl.handle.net/21.15107/rcub_vinar_11344 .

Cvijović-Alagić, Ivana, Laketić, Slađana, Veljović, Đorđe, Kojić, Vesna, Bajat, Jelena, Rakin, Marko, "Ultrafine-grained microstructure effect on the biomedical Ti-based alloy performance" in NANOSTRUC 2023 : International Conference on Structural Nano Composites (2023):31,
https://hdl.handle.net/21.15107/rcub_vinar_11344 .

TY  - CONF
AU  - Cvijović-Alagić, Ivana
AU  - Laketić, Slađana
AU  - Zagorac, Dejan
AU  - Bajat, Jelena
AU  - Veljović, Đorđe
AU  - Kojić, Vesna
AU  - Rakin, Marko
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11342
AB  - The high-pressure torsion (HPT) post-processing treatment influence on the grain refinement, corrosion behavior, and biocompatible properties of the Ti-45Nb (mass%) alloy, as a promising new hard-tissue replacement material, was investigated in the present study. The HPT-induced microstructural alterations were experimentally analyzed by electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), x-ray diffraction (XRD), and Vickers microhardness measurements, while additional theoretical investigations on the ab initio level were conducted to fully investigate the HPT influence on the alloy microstructural properties. Results showed that significant microstructural refinement was achieved through the HPT processing while a change in alloy phase composition was not detected. In both, unrefined and refined, microstructures the β-Ti and Ti4Nb phases were identified and confirmed by the ab initio modeling results. The microstructural alterations effect on the alloy corrosion behavior in simulated physiological conditions was examined through the potentiodynamic polarization measurements. In vitro tests were conducted to determine the grain refinement influence on the investigated alloy and live cells interaction. Attained results indicated that the HPT treatment can be successfully applied to improve the Ti-45Nb alloy bio-corrosive performance through an increase of the alloy hardness, corrosion resistance, and live cells viability during the alloy-cells interaction.
AB  - Tokom prezentovanog istraživanja ispitan je uticaj postupka uvijanja pod visokim pritiskom (UVP) na rafinaciju zrna, koroziono ponašanje i biokompatibilna svojstva Ti-45Nb (mas.%) legure, kao potencijalnog materijala za izradu kostnih implanata. Mikrostrukturne promene, uslovljene primenom UVP postupka, analizirane su elektronskom difrakcijom, transmisionom elektronskom mikroskopijom, difrakcijom x-zraka i određivanjem mikrotvrdoće, dok su teorijska istraživanja na ab initio nivou izvršena u cilju potpunog ispitivanja uticaja UVP metode na mikrostrukturna svojstva legure. Primenom UVP postupka postignuto je značajno usitnjavanje mikrostrukture bez promene faznog sastava legure. U nerafinisanoj i rafinisanoj mikrostrukturi identifikovane su β-Ti i Ti4Nb faze, što su potvrdili i rezultati ab initio modelovanja. Uticaj promene mikrostrukturnih svojstava na korozionu postojanost legure u simuliranim fiziološkim uslovima ispitan je potenciodinamičkom metodom. Uticaj rafinacije zrna na potencijalnu interakciju implantne legure sa živim ćelijama ispitan je primenom in vitro metoda. Potvrđeno je da se UVP obrada može uspešno primeniti za poboljšanje bio-korozionog ponašanja Ti-45Nb legure kroz povećanje tvrdoće i korozione otpornosti legure, kao i vijabilnosti ćelija tokom interakcije legure sa živim ćelijama
PB  - Beograd : Serbian Society of Corrosion and Materials Protection UISKOZAM = Udruženje inženjera Srbije za koroziju i zaštitu materijala UISKOZAM
C3  - XXII YuCorr International Conference : Proceedings
T1  - Microstructural refinement influence on the Ti-45Nb alloy properties in physiological conditions
T1  - Uticaj usitnjavanja mikrostrukture na svojstva Ti-45Nb legure u fiziološkim uslovima
SP  - 138
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11342
ER  - 

@conference{
author = "Cvijović-Alagić, Ivana and Laketić, Slađana and Zagorac, Dejan and Bajat, Jelena and Veljović, Đorđe and Kojić, Vesna and Rakin, Marko",
year = "2021",
abstract = "The high-pressure torsion (HPT) post-processing treatment influence on the grain refinement, corrosion behavior, and biocompatible properties of the Ti-45Nb (mass%) alloy, as a promising new hard-tissue replacement material, was investigated in the present study. The HPT-induced microstructural alterations were experimentally analyzed by electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), x-ray diffraction (XRD), and Vickers microhardness measurements, while additional theoretical investigations on the ab initio level were conducted to fully investigate the HPT influence on the alloy microstructural properties. Results showed that significant microstructural refinement was achieved through the HPT processing while a change in alloy phase composition was not detected. In both, unrefined and refined, microstructures the β-Ti and Ti4Nb phases were identified and confirmed by the ab initio modeling results. The microstructural alterations effect on the alloy corrosion behavior in simulated physiological conditions was examined through the potentiodynamic polarization measurements. In vitro tests were conducted to determine the grain refinement influence on the investigated alloy and live cells interaction. Attained results indicated that the HPT treatment can be successfully applied to improve the Ti-45Nb alloy bio-corrosive performance through an increase of the alloy hardness, corrosion resistance, and live cells viability during the alloy-cells interaction., Tokom prezentovanog istraživanja ispitan je uticaj postupka uvijanja pod visokim pritiskom (UVP) na rafinaciju zrna, koroziono ponašanje i biokompatibilna svojstva Ti-45Nb (mas.%) legure, kao potencijalnog materijala za izradu kostnih implanata. Mikrostrukturne promene, uslovljene primenom UVP postupka, analizirane su elektronskom difrakcijom, transmisionom elektronskom mikroskopijom, difrakcijom x-zraka i određivanjem mikrotvrdoće, dok su teorijska istraživanja na ab initio nivou izvršena u cilju potpunog ispitivanja uticaja UVP metode na mikrostrukturna svojstva legure. Primenom UVP postupka postignuto je značajno usitnjavanje mikrostrukture bez promene faznog sastava legure. U nerafinisanoj i rafinisanoj mikrostrukturi identifikovane su β-Ti i Ti4Nb faze, što su potvrdili i rezultati ab initio modelovanja. Uticaj promene mikrostrukturnih svojstava na korozionu postojanost legure u simuliranim fiziološkim uslovima ispitan je potenciodinamičkom metodom. Uticaj rafinacije zrna na potencijalnu interakciju implantne legure sa živim ćelijama ispitan je primenom in vitro metoda. Potvrđeno je da se UVP obrada može uspešno primeniti za poboljšanje bio-korozionog ponašanja Ti-45Nb legure kroz povećanje tvrdoće i korozione otpornosti legure, kao i vijabilnosti ćelija tokom interakcije legure sa živim ćelijama",
publisher = "Beograd : Serbian Society of Corrosion and Materials Protection UISKOZAM = Udruženje inženjera Srbije za koroziju i zaštitu materijala UISKOZAM",
journal = "XXII YuCorr International Conference : Proceedings",
title = "Microstructural refinement influence on the Ti-45Nb alloy properties in physiological conditions, Uticaj usitnjavanja mikrostrukture na svojstva Ti-45Nb legure u fiziološkim uslovima",
pages = "138",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11342"
}

Cvijović-Alagić, I., Laketić, S., Zagorac, D., Bajat, J., Veljović, Đ., Kojić, V.,& Rakin, M.. (2021). Microstructural refinement influence on the Ti-45Nb alloy properties in physiological conditions. in XXII YuCorr International Conference : Proceedings
Beograd : Serbian Society of Corrosion and Materials Protection UISKOZAM = Udruženje inženjera Srbije za koroziju i zaštitu materijala UISKOZAM., 138.
https://hdl.handle.net/21.15107/rcub_vinar_11342

Cvijović-Alagić I, Laketić S, Zagorac D, Bajat J, Veljović Đ, Kojić V, Rakin M. Microstructural refinement influence on the Ti-45Nb alloy properties in physiological conditions. in XXII YuCorr International Conference : Proceedings. 2021;:138.
https://hdl.handle.net/21.15107/rcub_vinar_11342 .

Cvijović-Alagić, Ivana, Laketić, Slađana, Zagorac, Dejan, Bajat, Jelena, Veljović, Đorđe, Kojić, Vesna, Rakin, Marko, "Microstructural refinement influence on the Ti-45Nb alloy properties in physiological conditions" in XXII YuCorr International Conference : Proceedings (2021):138,
https://hdl.handle.net/21.15107/rcub_vinar_11342 .

TY  - JOUR
AU  - Riđošić, Marija
AU  - Bučko, Mihael
AU  - Salicio-Paz, Asier
AU  - García-Lecina, Eva
AU  - Živković, Ljiljana
AU  - Bajat, Jelena B.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9905
AB  - Novel Zn-Co-CeO2 protective composite coatings were deposited successfully from chloride plating solutions. Two different types of ceria sources were used and compared: commercial ceria powder and home-made ceria sol. Electrodeposition was performed by a direct current in the range of 1–8 A dm−2. Two different agitation modes were used and compared, magnetic stirring and ultrasound-assisted stirring (US). The influence of magnetic stirring on the stability of the related plating baths was evaluated via a dynamic scattering method. The results pointed to better stability of the prepared ceria sol. The morphology of the composite coatings was examined by scanning electron microscopy (SEM), and particle content was determined by energy-dispersive X-ray spectroscopy (EDS). The results showed that the increase in the deposition current density was not beneficial to the coating morphology and particle content. The corrosion behavior of the Zn-Co-CeO2 composite coatings was analyzed and compared by electrochemical impedance spectroscopy and polarization resistance. The ultrasound-assisted electrodeposition at small current densities was favorable for obtaining composite coatings with enhanced corrosion stability. The protection was more effective when US was applied and, additionally, upon utilization of ceria sol as a particle source, which was revealed by higher polarization resistance and greater low-frequency impedance modulus values for sol-derived composite coatings deposited under ultrasound.
T2  - Molecules
T1  - Ceria Particles as Efficient Dopant in the Electrodeposition of Zn-Co-CeO2 Composite Coatings with Enhanced Corrosion Resistance: The Effect of Current Density and Particle Concentration
VL  - 26
IS  - 15
SP  - 4578
DO  - 10.3390/molecules26154578
ER  - 

@article{
author = "Riđošić, Marija and Bučko, Mihael and Salicio-Paz, Asier and García-Lecina, Eva and Živković, Ljiljana and Bajat, Jelena B.",
year = "2021",
abstract = "Novel Zn-Co-CeO2 protective composite coatings were deposited successfully from chloride plating solutions. Two different types of ceria sources were used and compared: commercial ceria powder and home-made ceria sol. Electrodeposition was performed by a direct current in the range of 1–8 A dm−2. Two different agitation modes were used and compared, magnetic stirring and ultrasound-assisted stirring (US). The influence of magnetic stirring on the stability of the related plating baths was evaluated via a dynamic scattering method. The results pointed to better stability of the prepared ceria sol. The morphology of the composite coatings was examined by scanning electron microscopy (SEM), and particle content was determined by energy-dispersive X-ray spectroscopy (EDS). The results showed that the increase in the deposition current density was not beneficial to the coating morphology and particle content. The corrosion behavior of the Zn-Co-CeO2 composite coatings was analyzed and compared by electrochemical impedance spectroscopy and polarization resistance. The ultrasound-assisted electrodeposition at small current densities was favorable for obtaining composite coatings with enhanced corrosion stability. The protection was more effective when US was applied and, additionally, upon utilization of ceria sol as a particle source, which was revealed by higher polarization resistance and greater low-frequency impedance modulus values for sol-derived composite coatings deposited under ultrasound.",
journal = "Molecules",
title = "Ceria Particles as Efficient Dopant in the Electrodeposition of Zn-Co-CeO2 Composite Coatings with Enhanced Corrosion Resistance: The Effect of Current Density and Particle Concentration",
volume = "26",
number = "15",
pages = "4578",
doi = "10.3390/molecules26154578"
}

Riđošić, M., Bučko, M., Salicio-Paz, A., García-Lecina, E., Živković, L.,& Bajat, J. B.. (2021). Ceria Particles as Efficient Dopant in the Electrodeposition of Zn-Co-CeO2 Composite Coatings with Enhanced Corrosion Resistance: The Effect of Current Density and Particle Concentration. in Molecules, 26(15), 4578.
https://doi.org/10.3390/molecules26154578

Riđošić M, Bučko M, Salicio-Paz A, García-Lecina E, Živković L, Bajat JB. Ceria Particles as Efficient Dopant in the Electrodeposition of Zn-Co-CeO2 Composite Coatings with Enhanced Corrosion Resistance: The Effect of Current Density and Particle Concentration. in Molecules. 2021;26(15):4578.
doi:10.3390/molecules26154578 .

Riđošić, Marija, Bučko, Mihael, Salicio-Paz, Asier, García-Lecina, Eva, Živković, Ljiljana, Bajat, Jelena B., "Ceria Particles as Efficient Dopant in the Electrodeposition of Zn-Co-CeO2 Composite Coatings with Enhanced Corrosion Resistance: The Effect of Current Density and Particle Concentration" in Molecules, 26, no. 15 (2021):4578,
https://doi.org/10.3390/molecules26154578 . .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Laketić, Slađana
AU  - Bajat, Jelena B.
AU  - Hohenwarter, Anton
AU  - Rakin, Marko
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9903
AB  - In this study, the influence of microstructural refinement induced by the high-pressure torsion (HPT) on the corrosion resistance of the Ti-45Nb (mass%) alloy was investigated. The alloy characteristics before and after the HPT deformation were analyzed by electron backscatter diffraction (EBSD), scanning transmission electron microscopy (STEM), x-ray diffraction (XRD), and Vickers microhardness measurements, while the alloy corrosion behavior in simulated physiological conditions was examined by potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS) analysis. Detailed microstructural analyses revealed that the HPT deformation led to significant grain refinement of the Ti-45Nb alloy exhibiting an ultra-fine grained (UFG) microstructure along with a substantial increase of hardness. Results also indicated that the grain refinement did not affect the alloy phase composition since β-Ti and Ti4Nb phases were present in the microstructure before and after the HPT deformation. Even though the Ti-45Nb alloy in both, coarse-grained (CG) and UFG, conditions shows high corrosion resistance in Ringer's solution at 37 °C, it was observed that the HPT treatment additionally improved the alloy corrosion properties. Namely, more rapid formation of the passivating layer with better barrier properties on the UFG alloy surface was recorded and resulted in better corrosion resistance of the alloy after HPT deformation. An increase of the grain contact area in the refined microstructure caused an increase of the diffusive transfer along the grain boundaries, accelerated the formation of a less defective protective barrier surface layer, and promoted the alloy surface passivation in the simulated physiological conditions.
T2  - Surface and Coatings Technology
T1  - Grain refinement effect on the Ti-45Nb alloy electrochemical behavior in simulated physiological solution
VL  - 423
SP  - 127609
DO  - 10.1016/j.surfcoat.2021.127609
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Laketić, Slađana and Bajat, Jelena B. and Hohenwarter, Anton and Rakin, Marko",
year = "2021",
abstract = "In this study, the influence of microstructural refinement induced by the high-pressure torsion (HPT) on the corrosion resistance of the Ti-45Nb (mass%) alloy was investigated. The alloy characteristics before and after the HPT deformation were analyzed by electron backscatter diffraction (EBSD), scanning transmission electron microscopy (STEM), x-ray diffraction (XRD), and Vickers microhardness measurements, while the alloy corrosion behavior in simulated physiological conditions was examined by potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS) analysis. Detailed microstructural analyses revealed that the HPT deformation led to significant grain refinement of the Ti-45Nb alloy exhibiting an ultra-fine grained (UFG) microstructure along with a substantial increase of hardness. Results also indicated that the grain refinement did not affect the alloy phase composition since β-Ti and Ti4Nb phases were present in the microstructure before and after the HPT deformation. Even though the Ti-45Nb alloy in both, coarse-grained (CG) and UFG, conditions shows high corrosion resistance in Ringer's solution at 37 °C, it was observed that the HPT treatment additionally improved the alloy corrosion properties. Namely, more rapid formation of the passivating layer with better barrier properties on the UFG alloy surface was recorded and resulted in better corrosion resistance of the alloy after HPT deformation. An increase of the grain contact area in the refined microstructure caused an increase of the diffusive transfer along the grain boundaries, accelerated the formation of a less defective protective barrier surface layer, and promoted the alloy surface passivation in the simulated physiological conditions.",
journal = "Surface and Coatings Technology",
title = "Grain refinement effect on the Ti-45Nb alloy electrochemical behavior in simulated physiological solution",
volume = "423",
pages = "127609",
doi = "10.1016/j.surfcoat.2021.127609"
}

Cvijović-Alagić, I., Laketić, S., Bajat, J. B., Hohenwarter, A.,& Rakin, M.. (2021). Grain refinement effect on the Ti-45Nb alloy electrochemical behavior in simulated physiological solution. in Surface and Coatings Technology, 423, 127609.
https://doi.org/10.1016/j.surfcoat.2021.127609

Cvijović-Alagić I, Laketić S, Bajat JB, Hohenwarter A, Rakin M. Grain refinement effect on the Ti-45Nb alloy electrochemical behavior in simulated physiological solution. in Surface and Coatings Technology. 2021;423:127609.
doi:10.1016/j.surfcoat.2021.127609 .

Cvijović-Alagić, Ivana, Laketić, Slađana, Bajat, Jelena B., Hohenwarter, Anton, Rakin, Marko, "Grain refinement effect on the Ti-45Nb alloy electrochemical behavior in simulated physiological solution" in Surface and Coatings Technology, 423 (2021):127609,
https://doi.org/10.1016/j.surfcoat.2021.127609 . .

TY  - JOUR
AU  - Riđošić, Marija
AU  - Nikolić, Nebojša D.
AU  - Salicio-Paz, Asier
AU  - García-Lecina, Eva
AU  - Živković, Ljiljana
AU  - Bajat, Jelena B.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9657
AB  - Electrodeposition and characterization of novel ceria-doped Zn-Co composite coatings was the main goal of this research. Electrodeposited composite coatings were compared to pure Zn-Co coatings obtained under the same conditions. The effect of two ceria sources, powder and home-made sol, on the morphology and corrosion resistance of the composite coatings was determined. During the electrodeposition process the plating solution was successfully agitated in an ultrasound bath. The source of the particles was found to influence the stability and dispersity of plating solutions. The application of ceria sol resulted in an increase of the ceria content in the resulting coating and favored the refinement from cauliflower-like morphology (Zn-Co) to uniform and compact coral-like structure (Zn-Co-CeO2 sol). The corrosion resistance of the composite coatings was enhanced compared to bare Zn-Co as evidenced by electrochemical impedance spectroscopy and scanning Kelvin probe results. Zn-Co doped with ceria particles originating from ceria sol exhibited superior corrosion resistance compared to Zn-Co-CeO2 (powder) coatings. The self-healing rate of artificial defect was calculated based on measured Volta potential difference for which Zn-Co-CeO2 (sol) coatings exhibited a self-healing rate of 73.28% in a chloride-rich environment.
T2  - Metals
T1  - Zn-Co-CeO2 vs. Zn-Co Coatings: Effect of CeO2 Sol in the Enhancement of the Corrosion Performance of Electrodeposited Composite Coatings
VL  - 11
IS  - 5
SP  - 704
DO  - 10.3390/met11050704
ER  - 

@article{
author = "Riđošić, Marija and Nikolić, Nebojša D. and Salicio-Paz, Asier and García-Lecina, Eva and Živković, Ljiljana and Bajat, Jelena B.",
year = "2021",
abstract = "Electrodeposition and characterization of novel ceria-doped Zn-Co composite coatings was the main goal of this research. Electrodeposited composite coatings were compared to pure Zn-Co coatings obtained under the same conditions. The effect of two ceria sources, powder and home-made sol, on the morphology and corrosion resistance of the composite coatings was determined. During the electrodeposition process the plating solution was successfully agitated in an ultrasound bath. The source of the particles was found to influence the stability and dispersity of plating solutions. The application of ceria sol resulted in an increase of the ceria content in the resulting coating and favored the refinement from cauliflower-like morphology (Zn-Co) to uniform and compact coral-like structure (Zn-Co-CeO2 sol). The corrosion resistance of the composite coatings was enhanced compared to bare Zn-Co as evidenced by electrochemical impedance spectroscopy and scanning Kelvin probe results. Zn-Co doped with ceria particles originating from ceria sol exhibited superior corrosion resistance compared to Zn-Co-CeO2 (powder) coatings. The self-healing rate of artificial defect was calculated based on measured Volta potential difference for which Zn-Co-CeO2 (sol) coatings exhibited a self-healing rate of 73.28% in a chloride-rich environment.",
journal = "Metals",
title = "Zn-Co-CeO2 vs. Zn-Co Coatings: Effect of CeO2 Sol in the Enhancement of the Corrosion Performance of Electrodeposited Composite Coatings",
volume = "11",
number = "5",
pages = "704",
doi = "10.3390/met11050704"
}

Riđošić, M., Nikolić, N. D., Salicio-Paz, A., García-Lecina, E., Živković, L.,& Bajat, J. B.. (2021). Zn-Co-CeO2 vs. Zn-Co Coatings: Effect of CeO2 Sol in the Enhancement of the Corrosion Performance of Electrodeposited Composite Coatings. in Metals, 11(5), 704.
https://doi.org/10.3390/met11050704

Riđošić M, Nikolić ND, Salicio-Paz A, García-Lecina E, Živković L, Bajat JB. Zn-Co-CeO2 vs. Zn-Co Coatings: Effect of CeO2 Sol in the Enhancement of the Corrosion Performance of Electrodeposited Composite Coatings. in Metals. 2021;11(5):704.
doi:10.3390/met11050704 .

Riđošić, Marija, Nikolić, Nebojša D., Salicio-Paz, Asier, García-Lecina, Eva, Živković, Ljiljana, Bajat, Jelena B., "Zn-Co-CeO2 vs. Zn-Co Coatings: Effect of CeO2 Sol in the Enhancement of the Corrosion Performance of Electrodeposited Composite Coatings" in Metals, 11, no. 5 (2021):704,
https://doi.org/10.3390/met11050704 . .

TY  - JOUR
AU  - Tomić, Miloš
AU  - Dunjić, Branko
AU  - Nikolić, Marija S.
AU  - Trifković, Kata
AU  - Stanković, Nadežda
AU  - Pavlović, Vladimir B.
AU  - Bajat, Jelena B.
AU  - Đonlagić, Jasna A.
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0300944018312487
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8076
AB  - In the present study the commercial multifunctional fatty acid polyamidoamine (PAA) was for the first time simultaneously applied as a curing agent and clay modifier for epoxy/clay nanocomposites (NC) based on diglycidyl ether of bisphenol A. The montmorillonite (Cloisite®Na + ) was modified with different quantities of partially and fully protonated polyamidoamine. The NCs with 0.5 wt% novel organoclay were prepared by solution intercalation method. The major aims of this paper are investigations of the effects of the composition of PAA modified clays on structure, mechanical, barrier properties and corrosion stability on steel substrates of NCs were studied. The thermogravimetric, flame photometry and X-ray diffraction analyses confirmed the efficient modification of clay surface with polyamidoamine, predominantly located within layers. The NCs exhibited an intercalated/exfoliated morphology and the presence of free amino groups and increased content of modifier facilitated dispersion of clay particles within the polymer matrix, as shown by electron microscopy techniques (SEM, TEM). Under an optimized loading of PAA (molar quantity of total amino groups per clay cation exchange capacity of 1.75), the layers in stacks were separated by 5.0 nm and high number of individual layers was present in NC. Clay modified by PAA with free amino groups showed increased storage modulus in the rubbery state, glass transition temperature of NCs, while dumping factor was decreased. The tensile test confirmed that introduction of flexible modifier on the epoxy/clay interface lead to increase in the ultimate tensile strenght and elongation at break by 31% and toughness up to 83%. The electrochemical impedance spectroscopy and permeability tests proved the pronounced barrier effect of clay particles against corrosive species and water vapor when high dispersion degree of clay in NC was achieved. © 2019 Elsevier B.V.
T2  - Progress in Organic Coatings
T1  - Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites
VL  - 131
SP  - 311
EP  - 321
DO  - 10.1016/j.porgcoat.2019.02.037
ER  - 

@article{
author = "Tomić, Miloš and Dunjić, Branko and Nikolić, Marija S. and Trifković, Kata and Stanković, Nadežda and Pavlović, Vladimir B. and Bajat, Jelena B. and Đonlagić, Jasna A.",
year = "2019",
abstract = "In the present study the commercial multifunctional fatty acid polyamidoamine (PAA) was for the first time simultaneously applied as a curing agent and clay modifier for epoxy/clay nanocomposites (NC) based on diglycidyl ether of bisphenol A. The montmorillonite (Cloisite®Na + ) was modified with different quantities of partially and fully protonated polyamidoamine. The NCs with 0.5 wt% novel organoclay were prepared by solution intercalation method. The major aims of this paper are investigations of the effects of the composition of PAA modified clays on structure, mechanical, barrier properties and corrosion stability on steel substrates of NCs were studied. The thermogravimetric, flame photometry and X-ray diffraction analyses confirmed the efficient modification of clay surface with polyamidoamine, predominantly located within layers. The NCs exhibited an intercalated/exfoliated morphology and the presence of free amino groups and increased content of modifier facilitated dispersion of clay particles within the polymer matrix, as shown by electron microscopy techniques (SEM, TEM). Under an optimized loading of PAA (molar quantity of total amino groups per clay cation exchange capacity of 1.75), the layers in stacks were separated by 5.0 nm and high number of individual layers was present in NC. Clay modified by PAA with free amino groups showed increased storage modulus in the rubbery state, glass transition temperature of NCs, while dumping factor was decreased. The tensile test confirmed that introduction of flexible modifier on the epoxy/clay interface lead to increase in the ultimate tensile strenght and elongation at break by 31% and toughness up to 83%. The electrochemical impedance spectroscopy and permeability tests proved the pronounced barrier effect of clay particles against corrosive species and water vapor when high dispersion degree of clay in NC was achieved. © 2019 Elsevier B.V.",
journal = "Progress in Organic Coatings",
title = "Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites",
volume = "131",
pages = "311-321",
doi = "10.1016/j.porgcoat.2019.02.037"
}

Tomić, M., Dunjić, B., Nikolić, M. S., Trifković, K., Stanković, N., Pavlović, V. B., Bajat, J. B.,& Đonlagić, J. A.. (2019). Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites. in Progress in Organic Coatings, 131, 311-321.
https://doi.org/10.1016/j.porgcoat.2019.02.037

Tomić M, Dunjić B, Nikolić MS, Trifković K, Stanković N, Pavlović VB, Bajat JB, Đonlagić JA. Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites. in Progress in Organic Coatings. 2019;131:311-321.
doi:10.1016/j.porgcoat.2019.02.037 .

Tomić, Miloš, Dunjić, Branko, Nikolić, Marija S., Trifković, Kata, Stanković, Nadežda, Pavlović, Vladimir B., Bajat, Jelena B., Đonlagić, Jasna A., "Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites" in Progress in Organic Coatings, 131 (2019):311-321,
https://doi.org/10.1016/j.porgcoat.2019.02.037 . .

TY  - JOUR
AU  - Živković, Ljiljana
AU  - Jegdić, Bore V.
AU  - Andrić, Velibor
AU  - Rhee, Kyong Yop
AU  - Bajat, Jelena B.
AU  - Mišković-Stanković, Vesna
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8422
AB  - In this work an attempt was made to produce epoxy coating doped with ceria (CeO2) and/or zirconia (ZrO2) nanoparticles, in single step electrophoretric deposition process. Deposition was carried out on AA6060 cataforetically from epoxy resin suspension containing synthesized stable aqueous colloidal dispersions (sols) of CeO2 and ZrO2. The influence of ceria and zirconia nanoparticles on the physicochemical characteristics of epoxy coatings was evaluated by energy dispersive X-ray fluorescence spectroscopy, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, Fourier-transform infrared spectroscopy, thermogravimetric analysis and adhesion measurements, while their corrosion stability during immersion in 0.5 M NaCl solution was monitored by electrochemical impedance spectroscopy. All ceria and/or zirconia containing coatings showed better corrosion stability and adhesion than pure epoxy coating, while between doped epoxy coatings one with CeO2/ZrO2 exhhibited the greatest values of charge-transfer resistance due to synergetic effect of both types of added nanoparticles. © 2019 Elsevier B.V.
T2  - Progress in Organic Coatings
T1  - The effect of ceria and zirconia nanoparticles on the corrosion behaviour of cataphoretic epoxy coatings on AA6060 alloy
VL  - 136
SP  - 105219
DO  - 10.1016/j.porgcoat.2019.105219
ER  - 

@article{
author = "Živković, Ljiljana and Jegdić, Bore V. and Andrić, Velibor and Rhee, Kyong Yop and Bajat, Jelena B. and Mišković-Stanković, Vesna",
year = "2019",
abstract = "In this work an attempt was made to produce epoxy coating doped with ceria (CeO2) and/or zirconia (ZrO2) nanoparticles, in single step electrophoretric deposition process. Deposition was carried out on AA6060 cataforetically from epoxy resin suspension containing synthesized stable aqueous colloidal dispersions (sols) of CeO2 and ZrO2. The influence of ceria and zirconia nanoparticles on the physicochemical characteristics of epoxy coatings was evaluated by energy dispersive X-ray fluorescence spectroscopy, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, Fourier-transform infrared spectroscopy, thermogravimetric analysis and adhesion measurements, while their corrosion stability during immersion in 0.5 M NaCl solution was monitored by electrochemical impedance spectroscopy. All ceria and/or zirconia containing coatings showed better corrosion stability and adhesion than pure epoxy coating, while between doped epoxy coatings one with CeO2/ZrO2 exhhibited the greatest values of charge-transfer resistance due to synergetic effect of both types of added nanoparticles. © 2019 Elsevier B.V.",
journal = "Progress in Organic Coatings",
title = "The effect of ceria and zirconia nanoparticles on the corrosion behaviour of cataphoretic epoxy coatings on AA6060 alloy",
volume = "136",
pages = "105219",
doi = "10.1016/j.porgcoat.2019.105219"
}

Živković, L., Jegdić, B. V., Andrić, V., Rhee, K. Y., Bajat, J. B.,& Mišković-Stanković, V.. (2019). The effect of ceria and zirconia nanoparticles on the corrosion behaviour of cataphoretic epoxy coatings on AA6060 alloy. in Progress in Organic Coatings, 136, 105219.
https://doi.org/10.1016/j.porgcoat.2019.105219

Živković L, Jegdić BV, Andrić V, Rhee KY, Bajat JB, Mišković-Stanković V. The effect of ceria and zirconia nanoparticles on the corrosion behaviour of cataphoretic epoxy coatings on AA6060 alloy. in Progress in Organic Coatings. 2019;136:105219.
doi:10.1016/j.porgcoat.2019.105219 .

Živković, Ljiljana, Jegdić, Bore V., Andrić, Velibor, Rhee, Kyong Yop, Bajat, Jelena B., Mišković-Stanković, Vesna, "The effect of ceria and zirconia nanoparticles on the corrosion behaviour of cataphoretic epoxy coatings on AA6060 alloy" in Progress in Organic Coatings, 136 (2019):105219,
https://doi.org/10.1016/j.porgcoat.2019.105219 . .

TY  - JOUR
AU  - Barjaktarević, Dragana R.
AU  - Đokić, Veljko R.
AU  - Bajat, Jelena B.
AU  - Dimić, Ivana D.
AU  - Cvijović-Alagić, Ivana
AU  - Rakin, Marko P.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8411
AB  - On the surface of the ultrafine-grained Ti–13Nb–13Zr alloy and the coarse-grained Ti–13Nb–13Zr alloy nanotubular oxide layers were formed by electrochemical anodization in the 1 M H3PO4 + NaF electrolyte in order to evaluate the electrochemical behaviour in the artificial saliva. SEM images showed that homogeneous nanotubular oxide layers could be formed by anodic oxidation of titanium alloys in an electrolyte with fluoride ions. These two titanium alloys, like other materials developed to replace the bone tissue in the human body, have to be highly corrosion resistant, which is one of the most common requirement in terms of the biocompatibility, damage and fracture prevention. The alloys were analysed by means of the electrochemical impedance spectroscopy and potentiodynamic polarization. The analyzed alloys had good corrosion stability, while nanotubular oxide layer improved their corrosion resistance. © 2019 Elsevier Ltd
T2  - Theoretical and Applied Fracture Mechanics
T1  - The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti–13Nb–13Zr alloy in artificial saliva
VL  - 103
SP  - 102307
DO  - 10.1016/j.tafmec.2019.102307
ER  - 

@article{
author = "Barjaktarević, Dragana R. and Đokić, Veljko R. and Bajat, Jelena B. and Dimić, Ivana D. and Cvijović-Alagić, Ivana and Rakin, Marko P.",
year = "2019",
abstract = "On the surface of the ultrafine-grained Ti–13Nb–13Zr alloy and the coarse-grained Ti–13Nb–13Zr alloy nanotubular oxide layers were formed by electrochemical anodization in the 1 M H3PO4 + NaF electrolyte in order to evaluate the electrochemical behaviour in the artificial saliva. SEM images showed that homogeneous nanotubular oxide layers could be formed by anodic oxidation of titanium alloys in an electrolyte with fluoride ions. These two titanium alloys, like other materials developed to replace the bone tissue in the human body, have to be highly corrosion resistant, which is one of the most common requirement in terms of the biocompatibility, damage and fracture prevention. The alloys were analysed by means of the electrochemical impedance spectroscopy and potentiodynamic polarization. The analyzed alloys had good corrosion stability, while nanotubular oxide layer improved their corrosion resistance. © 2019 Elsevier Ltd",
journal = "Theoretical and Applied Fracture Mechanics",
title = "The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti–13Nb–13Zr alloy in artificial saliva",
volume = "103",
pages = "102307",
doi = "10.1016/j.tafmec.2019.102307"
}

Barjaktarević, D. R., Đokić, V. R., Bajat, J. B., Dimić, I. D., Cvijović-Alagić, I.,& Rakin, M. P.. (2019). The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti–13Nb–13Zr alloy in artificial saliva. in Theoretical and Applied Fracture Mechanics, 103, 102307.
https://doi.org/10.1016/j.tafmec.2019.102307

Barjaktarević DR, Đokić VR, Bajat JB, Dimić ID, Cvijović-Alagić I, Rakin MP. The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti–13Nb–13Zr alloy in artificial saliva. in Theoretical and Applied Fracture Mechanics. 2019;103:102307.
doi:10.1016/j.tafmec.2019.102307 .

Barjaktarević, Dragana R., Đokić, Veljko R., Bajat, Jelena B., Dimić, Ivana D., Cvijović-Alagić, Ivana, Rakin, Marko P., "The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti–13Nb–13Zr alloy in artificial saliva" in Theoretical and Applied Fracture Mechanics, 103 (2019):102307,
https://doi.org/10.1016/j.tafmec.2019.102307 . .

TY  - JOUR
AU  - Tomić, Miloš
AU  - Dunjić, Branko
AU  - Nikolić, Marija S.
AU  - Maletaškić, Jelena
AU  - Pavlović, Vladimir B.
AU  - Bajat, Jelena B.
AU  - Đonlagić, Jasna A.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1951
AB  - The major aims of this paper are the investigation of the effects of the mixing procedure and the montmorillonite (Mt) surface modification on the structure (optical microscopy, XRD, TEM, SEM), rheological, mechanical properties (DMA, tensile test) and corrosion stability (electrochemical impedance spectroscopy) of clay mineral/epoxy nanocomposite (CPN). Two series of CPN samples were prepared based on diglycidyl ether of bisphenol A (DGEBA) and polyamidoamine curing agent with three organophilic Mt and sodium-montmorillonite (1 wt%). Mt were mixed with DGEBA solution in the powder (direct mixing) and in the form of dispersions, preswollen in a commercial coating thinner (solution intercalation). The commercial Mt (Cloisite 30B) modified by quaternary alkylammonium ions bearing hydroxyl groups and especially Mt functionalized by primary (HDA(+)-Mt) alkylammonium ions, at loadings close to cation exchange capacity (CRC), were significantly swollen by thinner and further uniformly dispersed into CPN. Meanwhile, low gel volumes in thinner were found for more hydrophobic Mt (Cloisite 15A). The compatibility of Mt with solvents was well described by solubility and Flory-Huggins interaction parameters. In contrast to the direct incorporation of Mt powders in CPN, swelling enhanced intercalation of epoxy matrix into Mt, and for HDA(+)-Mt based CPN interlayer spacing reached 4.4 nm. The usage of HDA(+)-Mt organoclay and solution intercalation procedure provided the highest enhancement in rheological parameters (G, G, of Mt/epoxy dispersions and glassy storage modulus, Youngs modulus and barrier properties of cured CPN.
T2  - Applied Clay Science
T1  - Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods
VL  - 154
SP  - 52
EP  - 63
DO  - 10.1016/j.clay.2017.12.047
ER  - 

@article{
author = "Tomić, Miloš and Dunjić, Branko and Nikolić, Marija S. and Maletaškić, Jelena and Pavlović, Vladimir B. and Bajat, Jelena B. and Đonlagić, Jasna A.",
year = "2018",
abstract = "The major aims of this paper are the investigation of the effects of the mixing procedure and the montmorillonite (Mt) surface modification on the structure (optical microscopy, XRD, TEM, SEM), rheological, mechanical properties (DMA, tensile test) and corrosion stability (electrochemical impedance spectroscopy) of clay mineral/epoxy nanocomposite (CPN). Two series of CPN samples were prepared based on diglycidyl ether of bisphenol A (DGEBA) and polyamidoamine curing agent with three organophilic Mt and sodium-montmorillonite (1 wt%). Mt were mixed with DGEBA solution in the powder (direct mixing) and in the form of dispersions, preswollen in a commercial coating thinner (solution intercalation). The commercial Mt (Cloisite 30B) modified by quaternary alkylammonium ions bearing hydroxyl groups and especially Mt functionalized by primary (HDA(+)-Mt) alkylammonium ions, at loadings close to cation exchange capacity (CRC), were significantly swollen by thinner and further uniformly dispersed into CPN. Meanwhile, low gel volumes in thinner were found for more hydrophobic Mt (Cloisite 15A). The compatibility of Mt with solvents was well described by solubility and Flory-Huggins interaction parameters. In contrast to the direct incorporation of Mt powders in CPN, swelling enhanced intercalation of epoxy matrix into Mt, and for HDA(+)-Mt based CPN interlayer spacing reached 4.4 nm. The usage of HDA(+)-Mt organoclay and solution intercalation procedure provided the highest enhancement in rheological parameters (G, G, of Mt/epoxy dispersions and glassy storage modulus, Youngs modulus and barrier properties of cured CPN.",
journal = "Applied Clay Science",
title = "Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods",
volume = "154",
pages = "52-63",
doi = "10.1016/j.clay.2017.12.047"
}

Tomić, M., Dunjić, B., Nikolić, M. S., Maletaškić, J., Pavlović, V. B., Bajat, J. B.,& Đonlagić, J. A.. (2018). Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods. in Applied Clay Science, 154, 52-63.
https://doi.org/10.1016/j.clay.2017.12.047

Tomić M, Dunjić B, Nikolić MS, Maletaškić J, Pavlović VB, Bajat JB, Đonlagić JA. Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods. in Applied Clay Science. 2018;154:52-63.
doi:10.1016/j.clay.2017.12.047 .

Tomić, Miloš, Dunjić, Branko, Nikolić, Marija S., Maletaškić, Jelena, Pavlović, Vladimir B., Bajat, Jelena B., Đonlagić, Jasna A., "Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods" in Applied Clay Science, 154 (2018):52-63,
https://doi.org/10.1016/j.clay.2017.12.047 . .

TY  - JOUR
AU  - Barjaktarević, Dragana
AU  - Bajat, Jelena
AU  - Cvijović-Alagić, Ivana
AU  - Dimić, Ivana
AU  - Hohenwarter, Anton
AU  - Đokić, Veljko
AU  - Rakin, Marko
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11334
AB  - In order to optimize and enhance the implant material properties, metallic materials may be modified by severe plastic deformation (SPD) procedures. One of the most attracting SPD methods is high-pressure torsion (HPT), which is method where deformation is obtained mainly by simple shear. In the present study ultrafine-grained titanium (UFG cpTi) and ultrafine-grained Ti-13Nb-13Zr (UFG TNZ) alloy were obtained by high pressure torsion (HPT) under a pressure of 4.1 GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. In order to analyse microstructure of materials before and after HPT process, scanning electron microscope (SEM) was used. The aim of this study was to determine the corrosion resistance of titanium and its alloy after HPT process. Electrochemical measurements were performed in artificial saliva with a pH value of 5.5 at 37 degrees C, in order to simulate the oral environment. The materials were analysed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. All examined materials showed good corrosion resistance, but results indicate that HPT process can improves corrosion resistance.
T2  - Procedia Structural Integrity
T1  - The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion
VL  - 13
SP  - 1834
EP  - 1839
DO  - 10.1016/j.prostr.2018.12.332
ER  - 

@article{
author = "Barjaktarević, Dragana and Bajat, Jelena and Cvijović-Alagić, Ivana and Dimić, Ivana and Hohenwarter, Anton and Đokić, Veljko and Rakin, Marko",
year = "2018",
abstract = "In order to optimize and enhance the implant material properties, metallic materials may be modified by severe plastic deformation (SPD) procedures. One of the most attracting SPD methods is high-pressure torsion (HPT), which is method where deformation is obtained mainly by simple shear. In the present study ultrafine-grained titanium (UFG cpTi) and ultrafine-grained Ti-13Nb-13Zr (UFG TNZ) alloy were obtained by high pressure torsion (HPT) under a pressure of 4.1 GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. In order to analyse microstructure of materials before and after HPT process, scanning electron microscope (SEM) was used. The aim of this study was to determine the corrosion resistance of titanium and its alloy after HPT process. Electrochemical measurements were performed in artificial saliva with a pH value of 5.5 at 37 degrees C, in order to simulate the oral environment. The materials were analysed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. All examined materials showed good corrosion resistance, but results indicate that HPT process can improves corrosion resistance.",
journal = "Procedia Structural Integrity",
title = "The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion",
volume = "13",
pages = "1834-1839",
doi = "10.1016/j.prostr.2018.12.332"
}

Barjaktarević, D., Bajat, J., Cvijović-Alagić, I., Dimić, I., Hohenwarter, A., Đokić, V.,& Rakin, M.. (2018). The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Procedia Structural Integrity, 13, 1834-1839.
https://doi.org/10.1016/j.prostr.2018.12.332

Barjaktarević D, Bajat J, Cvijović-Alagić I, Dimić I, Hohenwarter A, Đokić V, Rakin M. The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Procedia Structural Integrity. 2018;13:1834-1839.
doi:10.1016/j.prostr.2018.12.332 .

Barjaktarević, Dragana, Bajat, Jelena, Cvijović-Alagić, Ivana, Dimić, Ivana, Hohenwarter, Anton, Đokić, Veljko, Rakin, Marko, "The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion" in Procedia Structural Integrity, 13 (2018):1834-1839,
https://doi.org/10.1016/j.prostr.2018.12.332 . .

TY  - CONF
AU  - Barjaktarević, Dragana R.
AU  - Bajat, Jelena B.
AU  - Cvijović-Alagić, Ivana
AU  - Dimić, Ivana
AU  - Hohenwarter, Anton
AU  - Đokić, Veljko R.
AU  - Rakin, Marko P.
PY  - 2018
UR  - https://linkinghub.elsevier.com/retrieve/pii/S2452321618305730
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8164
AB  - In order to optimize and enhance the implant material properties, metallic materials may be modified by severe plastic deformation (SPD) procedures. One of the most attracting SPD methods is high-pressure torsion (HPT), which is method where deformation is obtained mainly by simple shear. In the present study ultrafine-grained titanium (UFG cpTi) and ultrafine-grained Ti-13Nb-13Zr (UFG TNZ) alloy were obtained by high pressure torsion (HPT) under a pressure of 4.1 GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. In order to analyse microstructure of materials before and after HPT process, scanning electron microscope (SEM) was used. The aim of this study was to determine the corrosion resistance of titanium and its alloy after HPT process. Electrochemical measurements were performed in artificial saliva with a pH value of 5.5 at 37°C, in order to simulate the oral environment. The materials were analysed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. All examined materials showed good corrosion resistance, but results indicate that HPT process can improves corrosion resistance. © 2018 The Authors.
C3  - Procedia Structural Integrity
T1  - The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion
VL  - 13
SP  - 1834
EP  - 1839
DO  - 10.1016/j.prostr.2018.12.332
ER  - 

@conference{
author = "Barjaktarević, Dragana R. and Bajat, Jelena B. and Cvijović-Alagić, Ivana and Dimić, Ivana and Hohenwarter, Anton and Đokić, Veljko R. and Rakin, Marko P.",
year = "2018",
abstract = "In order to optimize and enhance the implant material properties, metallic materials may be modified by severe plastic deformation (SPD) procedures. One of the most attracting SPD methods is high-pressure torsion (HPT), which is method where deformation is obtained mainly by simple shear. In the present study ultrafine-grained titanium (UFG cpTi) and ultrafine-grained Ti-13Nb-13Zr (UFG TNZ) alloy were obtained by high pressure torsion (HPT) under a pressure of 4.1 GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. In order to analyse microstructure of materials before and after HPT process, scanning electron microscope (SEM) was used. The aim of this study was to determine the corrosion resistance of titanium and its alloy after HPT process. Electrochemical measurements were performed in artificial saliva with a pH value of 5.5 at 37°C, in order to simulate the oral environment. The materials were analysed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. All examined materials showed good corrosion resistance, but results indicate that HPT process can improves corrosion resistance. © 2018 The Authors.",
journal = "Procedia Structural Integrity",
title = "The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion",
volume = "13",
pages = "1834-1839",
doi = "10.1016/j.prostr.2018.12.332"
}

Barjaktarević, D. R., Bajat, J. B., Cvijović-Alagić, I., Dimić, I., Hohenwarter, A., Đokić, V. R.,& Rakin, M. P.. (2018). The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Procedia Structural Integrity, 13, 1834-1839.
https://doi.org/10.1016/j.prostr.2018.12.332

Barjaktarević DR, Bajat JB, Cvijović-Alagić I, Dimić I, Hohenwarter A, Đokić VR, Rakin MP. The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Procedia Structural Integrity. 2018;13:1834-1839.
doi:10.1016/j.prostr.2018.12.332 .

Barjaktarević, Dragana R., Bajat, Jelena B., Cvijović-Alagić, Ivana, Dimić, Ivana, Hohenwarter, Anton, Đokić, Veljko R., Rakin, Marko P., "The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion" in Procedia Structural Integrity, 13 (2018):1834-1839,
https://doi.org/10.1016/j.prostr.2018.12.332 . .

TY  - JOUR
AU  - Jegdić, Bore V.
AU  - Živković, Ljiljana
AU  - Popić, Jovan P.
AU  - Rogan, Jelena R.
AU  - Bajat, Jelena B.
AU  - Mišković-Stanković, Vesna B.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1294
AB  - In this study, corrosion protection efficiency of undoped epoxy and epoxy coating doped with cerium on aluminum alloy AA6060 is evaluated over prolonged exposure to 3wt% NaCl solution by electrochemical impedance spectroscopy (EIS). Different amounts of Ce(NO3)(3) are added into the epoxy suspension used for the cataphoretic deposition. Suspension stability is characterized by zeta potential and particle size values. Water content and thermal stability of the coatings were determined by thermogravimetric analysis. Insufficient corrosion stability, very close to that of undoped epoxy, is revealed for the coating with 1mM Ce. Higher cerium doping contributes to a significant increase in corrosion stability (2-3 orders of magnitude greater charge-transfer resistance). Epoxy coating doped with 5mM Ce displays a pronounced self-healing ability and the best corrosion protection and adhesion, owing to evenly distributed cerium precipitates on the aluminum surface. In the case of 10mM Ce-doped coating, the formation of Ce clusters and higher porosity causes a certain lowering of the protective ability. EIS measurements on epoxy coating with artificial defect confirm these findings.
T2  - Materials and Corrosion (Werkstoffe und Korrosion)
T1  - Corrosion stability of cerium-doped cataphoretic epoxy coatings on AA6060 alloy
VL  - 67
IS  - 11
SP  - 1173
EP  - 1184
DO  - 10.1002/maco.201608827
ER  - 

@article{
author = "Jegdić, Bore V. and Živković, Ljiljana and Popić, Jovan P. and Rogan, Jelena R. and Bajat, Jelena B. and Mišković-Stanković, Vesna B.",
year = "2016",
abstract = "In this study, corrosion protection efficiency of undoped epoxy and epoxy coating doped with cerium on aluminum alloy AA6060 is evaluated over prolonged exposure to 3wt% NaCl solution by electrochemical impedance spectroscopy (EIS). Different amounts of Ce(NO3)(3) are added into the epoxy suspension used for the cataphoretic deposition. Suspension stability is characterized by zeta potential and particle size values. Water content and thermal stability of the coatings were determined by thermogravimetric analysis. Insufficient corrosion stability, very close to that of undoped epoxy, is revealed for the coating with 1mM Ce. Higher cerium doping contributes to a significant increase in corrosion stability (2-3 orders of magnitude greater charge-transfer resistance). Epoxy coating doped with 5mM Ce displays a pronounced self-healing ability and the best corrosion protection and adhesion, owing to evenly distributed cerium precipitates on the aluminum surface. In the case of 10mM Ce-doped coating, the formation of Ce clusters and higher porosity causes a certain lowering of the protective ability. EIS measurements on epoxy coating with artificial defect confirm these findings.",
journal = "Materials and Corrosion (Werkstoffe und Korrosion)",
title = "Corrosion stability of cerium-doped cataphoretic epoxy coatings on AA6060 alloy",
volume = "67",
number = "11",
pages = "1173-1184",
doi = "10.1002/maco.201608827"
}

Jegdić, B. V., Živković, L., Popić, J. P., Rogan, J. R., Bajat, J. B.,& Mišković-Stanković, V. B.. (2016). Corrosion stability of cerium-doped cataphoretic epoxy coatings on AA6060 alloy. in Materials and Corrosion (Werkstoffe und Korrosion), 67(11), 1173-1184.
https://doi.org/10.1002/maco.201608827

Jegdić BV, Živković L, Popić JP, Rogan JR, Bajat JB, Mišković-Stanković VB. Corrosion stability of cerium-doped cataphoretic epoxy coatings on AA6060 alloy. in Materials and Corrosion (Werkstoffe und Korrosion). 2016;67(11):1173-1184.
doi:10.1002/maco.201608827 .

Jegdić, Bore V., Živković, Ljiljana, Popić, Jovan P., Rogan, Jelena R., Bajat, Jelena B., Mišković-Stanković, Vesna B., "Corrosion stability of cerium-doped cataphoretic epoxy coatings on AA6060 alloy" in Materials and Corrosion (Werkstoffe und Korrosion), 67, no. 11 (2016):1173-1184,
https://doi.org/10.1002/maco.201608827 . .

TY  - JOUR
AU  - Gulicovski, Jelena J.
AU  - Bajat, Jelena B.
AU  - Jokić, Bojan M.
AU  - Panić, Vladimir
AU  - Mišković-Stanković, Vesna B.
AU  - Milonjić, Slobodan K.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/894
AB  - Ceria coating is formed on Al from the ceria sol prepared exclusively by forced hydrolysis of Ce(NO3)(4), in order to test their ability to protect Al from corrosion. The characterization of sol-gel-processed ceria coating and coating/Al assembly brings new issues on Al corrosion and protection caused by unique properties of the sol-gel coating. The corrosion behaviour of bare Al and Al/CeO2 is investigated by the electrochemical impedance spectroscopy (EIS) during the exposure to NaCl aqueous solution. The morphology and composition of the samples are examined by scanning electron microscopy and energy dispersive spectroscopy. EIS data showed greater corrosion resistance of CeO2-coated aluminium in comparison to bare Al at long exposure times. CeO2 coating does not hinder completely the corrosion processes on Al. The Al beneath CeO2 coating is subjected to intrinsic formation of a uniform protective coating/Al interphase, cross-linked by AlO(OH) fibre-like structures. They appear created by corrosive medium from the coating reversely gelled by NaCl solution. As the fibre network is created during exposure, Al becomes better protected than by spontaneous formation of porous passive layer of Al(OH)(3) on bare aluminium. Sol-gel ceria coatings thus improve corrosion resistance of aluminium during prolonged exposure to corrosive medium.
PB  - Springer
T2  - Journal of Solid State Electrochemistry
T1  - Protective ability and impedance response of sol-gel reversely transformed ceria conversion coating on aluminium
VL  - 20
IS  - 1
SP  - 293
EP  - 303
DO  - 10.1007/s10008-015-3040-3
ER  - 

@article{
author = "Gulicovski, Jelena J. and Bajat, Jelena B. and Jokić, Bojan M. and Panić, Vladimir and Mišković-Stanković, Vesna B. and Milonjić, Slobodan K.",
year = "2016",
abstract = "Ceria coating is formed on Al from the ceria sol prepared exclusively by forced hydrolysis of Ce(NO3)(4), in order to test their ability to protect Al from corrosion. The characterization of sol-gel-processed ceria coating and coating/Al assembly brings new issues on Al corrosion and protection caused by unique properties of the sol-gel coating. The corrosion behaviour of bare Al and Al/CeO2 is investigated by the electrochemical impedance spectroscopy (EIS) during the exposure to NaCl aqueous solution. The morphology and composition of the samples are examined by scanning electron microscopy and energy dispersive spectroscopy. EIS data showed greater corrosion resistance of CeO2-coated aluminium in comparison to bare Al at long exposure times. CeO2 coating does not hinder completely the corrosion processes on Al. The Al beneath CeO2 coating is subjected to intrinsic formation of a uniform protective coating/Al interphase, cross-linked by AlO(OH) fibre-like structures. They appear created by corrosive medium from the coating reversely gelled by NaCl solution. As the fibre network is created during exposure, Al becomes better protected than by spontaneous formation of porous passive layer of Al(OH)(3) on bare aluminium. Sol-gel ceria coatings thus improve corrosion resistance of aluminium during prolonged exposure to corrosive medium.",
publisher = "Springer",
journal = "Journal of Solid State Electrochemistry",
title = "Protective ability and impedance response of sol-gel reversely transformed ceria conversion coating on aluminium",
volume = "20",
number = "1",
pages = "293-303",
doi = "10.1007/s10008-015-3040-3"
}

Gulicovski, J. J., Bajat, J. B., Jokić, B. M., Panić, V., Mišković-Stanković, V. B.,& Milonjić, S. K.. (2016). Protective ability and impedance response of sol-gel reversely transformed ceria conversion coating on aluminium. in Journal of Solid State Electrochemistry
Springer., 20(1), 293-303.
https://doi.org/10.1007/s10008-015-3040-3

Gulicovski JJ, Bajat JB, Jokić BM, Panić V, Mišković-Stanković VB, Milonjić SK. Protective ability and impedance response of sol-gel reversely transformed ceria conversion coating on aluminium. in Journal of Solid State Electrochemistry. 2016;20(1):293-303.
doi:10.1007/s10008-015-3040-3 .

Gulicovski, Jelena J., Bajat, Jelena B., Jokić, Bojan M., Panić, Vladimir, Mišković-Stanković, Vesna B., Milonjić, Slobodan K., "Protective ability and impedance response of sol-gel reversely transformed ceria conversion coating on aluminium" in Journal of Solid State Electrochemistry, 20, no. 1 (2016):293-303,
https://doi.org/10.1007/s10008-015-3040-3 . .

TY  - JOUR
AU  - Bobić, Biljana M.
AU  - Bajat, Jelena B.
AU  - Bobić, Ilija
AU  - Jegdić, Bore V.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1174
AB  - The influence of corrosion on the surface appearance and microstructure of particulate ZA27/SiCp composites was examined after 30 d immersion in a sodium chloride solution with the access of atmospheric oxygen. The composites with different contents of SiC micro-particles were synthesized via compo casting. Microstructural studies by means of optical microscopy (OM) and scanning electron microscopy (SEM) showed that corrosion occurred in the composite matrices, preferentially in regions of the. phase, rich in zinc. The corrosion processes did not affect the silicon carbide particles incorporated in the matrix alloy. According to the results of electrochemical polarization measurements, an increase in the content of SiC particles in the composite matrice has led to the lower corrosion resistance in the composites.
T2  - Transactions of Nonferrous Metals Society of China
T1  - Corrosion influence on surface appearance and microstructure of compo cast ZA27/SiCp composites in sodium chloride solution
VL  - 26
IS  - 6
SP  - 1512
EP  - 1521
DO  - 10.1016/S1003-6326(16)64257-7
ER  - 

@article{
author = "Bobić, Biljana M. and Bajat, Jelena B. and Bobić, Ilija and Jegdić, Bore V.",
year = "2016",
abstract = "The influence of corrosion on the surface appearance and microstructure of particulate ZA27/SiCp composites was examined after 30 d immersion in a sodium chloride solution with the access of atmospheric oxygen. The composites with different contents of SiC micro-particles were synthesized via compo casting. Microstructural studies by means of optical microscopy (OM) and scanning electron microscopy (SEM) showed that corrosion occurred in the composite matrices, preferentially in regions of the. phase, rich in zinc. The corrosion processes did not affect the silicon carbide particles incorporated in the matrix alloy. According to the results of electrochemical polarization measurements, an increase in the content of SiC particles in the composite matrice has led to the lower corrosion resistance in the composites.",
journal = "Transactions of Nonferrous Metals Society of China",
title = "Corrosion influence on surface appearance and microstructure of compo cast ZA27/SiCp composites in sodium chloride solution",
volume = "26",
number = "6",
pages = "1512-1521",
doi = "10.1016/S1003-6326(16)64257-7"
}

Bobić, B. M., Bajat, J. B., Bobić, I.,& Jegdić, B. V.. (2016). Corrosion influence on surface appearance and microstructure of compo cast ZA27/SiCp composites in sodium chloride solution. in Transactions of Nonferrous Metals Society of China, 26(6), 1512-1521.
https://doi.org/10.1016/S1003-6326(16)64257-7

Bobić BM, Bajat JB, Bobić I, Jegdić BV. Corrosion influence on surface appearance and microstructure of compo cast ZA27/SiCp composites in sodium chloride solution. in Transactions of Nonferrous Metals Society of China. 2016;26(6):1512-1521.
doi:10.1016/S1003-6326(16)64257-7 .

Bobić, Biljana M., Bajat, Jelena B., Bobić, Ilija, Jegdić, Bore V., "Corrosion influence on surface appearance and microstructure of compo cast ZA27/SiCp composites in sodium chloride solution" in Transactions of Nonferrous Metals Society of China, 26, no. 6 (2016):1512-1521,
https://doi.org/10.1016/S1003-6326(16)64257-7 . .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Cvijović, Zorica M.
AU  - Bajat, Jelena B.
AU  - Rakin, Marko P.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1280
AB  - The electrochemical behaviour of the Ti-6Al-4V ELI alloy with different microstructures was investigated in Ringers solution at 25 degrees C. It was found that the properties of both inner barrier and outer porous layers of the passive film were dependent on the microstructural morphology and distribution of the alloying elements resulting in various amounts of their oxides incorporated in the TiO2 matrix. A more resistant and capacitive barrier layer formed on the alloy with fully lamellar, martensitic and globular microstructures in different thickness assured its high corrosion protection. The improved corrosion resistance of the alloy with equiaxed microstructure was provided by the existence of the larger amounts of the Al2O3 and V2O5 oxides, contributing to higher resistance of the outer porous layer. The Al2O3 amount is smaller than that of the V2O5 oxide due to its higher dissolution, especially in the case of the alloy with fully lamellar microstructure, resulting in the formation of a more porous outer layer.
T2  - Materials and Corrosion (Werkstoffe und Korrosion)
T1  - Electrochemical behaviour of Ti-6Al-4V alloy with different microstructures in a simulated bio-environment
VL  - 67
IS  - 10
SP  - 1075
EP  - 1087
DO  - 10.1002/maco.201508796
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Cvijović, Zorica M. and Bajat, Jelena B. and Rakin, Marko P.",
year = "2016",
abstract = "The electrochemical behaviour of the Ti-6Al-4V ELI alloy with different microstructures was investigated in Ringers solution at 25 degrees C. It was found that the properties of both inner barrier and outer porous layers of the passive film were dependent on the microstructural morphology and distribution of the alloying elements resulting in various amounts of their oxides incorporated in the TiO2 matrix. A more resistant and capacitive barrier layer formed on the alloy with fully lamellar, martensitic and globular microstructures in different thickness assured its high corrosion protection. The improved corrosion resistance of the alloy with equiaxed microstructure was provided by the existence of the larger amounts of the Al2O3 and V2O5 oxides, contributing to higher resistance of the outer porous layer. The Al2O3 amount is smaller than that of the V2O5 oxide due to its higher dissolution, especially in the case of the alloy with fully lamellar microstructure, resulting in the formation of a more porous outer layer.",
journal = "Materials and Corrosion (Werkstoffe und Korrosion)",
title = "Electrochemical behaviour of Ti-6Al-4V alloy with different microstructures in a simulated bio-environment",
volume = "67",
number = "10",
pages = "1075-1087",
doi = "10.1002/maco.201508796"
}

Cvijović-Alagić, I., Cvijović, Z. M., Bajat, J. B.,& Rakin, M. P.. (2016). Electrochemical behaviour of Ti-6Al-4V alloy with different microstructures in a simulated bio-environment. in Materials and Corrosion (Werkstoffe und Korrosion), 67(10), 1075-1087.
https://doi.org/10.1002/maco.201508796

Cvijović-Alagić I, Cvijović ZM, Bajat JB, Rakin MP. Electrochemical behaviour of Ti-6Al-4V alloy with different microstructures in a simulated bio-environment. in Materials and Corrosion (Werkstoffe und Korrosion). 2016;67(10):1075-1087.
doi:10.1002/maco.201508796 .

Cvijović-Alagić, Ivana, Cvijović, Zorica M., Bajat, Jelena B., Rakin, Marko P., "Electrochemical behaviour of Ti-6Al-4V alloy with different microstructures in a simulated bio-environment" in Materials and Corrosion (Werkstoffe und Korrosion), 67, no. 10 (2016):1075-1087,
https://doi.org/10.1002/maco.201508796 . .

TY  - JOUR
AU  - Živković, Ljiljana
AU  - Bajat, Jelena B.
AU  - Popić, Jovan P.
AU  - Jegdić, Bore V.
AU  - Stevanović, Sanja
AU  - Mišković-Stanković, Vesna B.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/384
AB  - Ce-based conversion coatings (CeCCs) are a promising alternative to toxic chromate coatings on the metal substrates. In this work the CeCCs were electrodeposited on aluminium alloy AA6060 from aqueous solution of Ce(NO3)(3) at different potentials (-0.95 V, -1.2 V and -1.4V). Effect of deposition potential and post-treatment in the phosphate solution on morphology and protective properties of CeCCs with top cataphoretic epoxy coating was studied. To assess the differences between the protective systems, originating from the different CeCCs pre-treatments, electrochemical impedance spectroscopy (EIS), polarization measurements, AFM and SEM/EDS analysis were used. The EIS study was undertaken to follow the evolution of corrosion behaviour of epoxy coating/CeCCs protective systems over prolonged time of exposure to the chloride environment (3 wt.% NaCl). Results suggest significantly improved corrosion stability of epoxy coating on AA6060 with as-deposited CeCCs sub-layers with respect to the same epoxy coatings with phosphate post-treated CeCCs. The far best protective properties, i.e., the greatest value of pore resistance and the lowest value of corrosion current density were provided by the epoxy coating/CeCC protective system with CeCC deposited at -1.2V and without post-treatment. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Progress in Organic Coatings
T1  - Protective properties of cataphoretic epoxy coating on aluminium alloy AA6060 modified with electrodeposited Ce-based coatings: Effect of post-treatment
VL  - 79
SP  - 43
EP  - 52
DO  - 10.1016/j.porgcoat.2014.10.014
ER  - 

@article{
author = "Živković, Ljiljana and Bajat, Jelena B. and Popić, Jovan P. and Jegdić, Bore V. and Stevanović, Sanja and Mišković-Stanković, Vesna B.",
year = "2015",
abstract = "Ce-based conversion coatings (CeCCs) are a promising alternative to toxic chromate coatings on the metal substrates. In this work the CeCCs were electrodeposited on aluminium alloy AA6060 from aqueous solution of Ce(NO3)(3) at different potentials (-0.95 V, -1.2 V and -1.4V). Effect of deposition potential and post-treatment in the phosphate solution on morphology and protective properties of CeCCs with top cataphoretic epoxy coating was studied. To assess the differences between the protective systems, originating from the different CeCCs pre-treatments, electrochemical impedance spectroscopy (EIS), polarization measurements, AFM and SEM/EDS analysis were used. The EIS study was undertaken to follow the evolution of corrosion behaviour of epoxy coating/CeCCs protective systems over prolonged time of exposure to the chloride environment (3 wt.% NaCl). Results suggest significantly improved corrosion stability of epoxy coating on AA6060 with as-deposited CeCCs sub-layers with respect to the same epoxy coatings with phosphate post-treated CeCCs. The far best protective properties, i.e., the greatest value of pore resistance and the lowest value of corrosion current density were provided by the epoxy coating/CeCC protective system with CeCC deposited at -1.2V and without post-treatment. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Progress in Organic Coatings",
title = "Protective properties of cataphoretic epoxy coating on aluminium alloy AA6060 modified with electrodeposited Ce-based coatings: Effect of post-treatment",
volume = "79",
pages = "43-52",
doi = "10.1016/j.porgcoat.2014.10.014"
}

Živković, L., Bajat, J. B., Popić, J. P., Jegdić, B. V., Stevanović, S.,& Mišković-Stanković, V. B.. (2015). Protective properties of cataphoretic epoxy coating on aluminium alloy AA6060 modified with electrodeposited Ce-based coatings: Effect of post-treatment. in Progress in Organic Coatings, 79, 43-52.
https://doi.org/10.1016/j.porgcoat.2014.10.014

Živković L, Bajat JB, Popić JP, Jegdić BV, Stevanović S, Mišković-Stanković VB. Protective properties of cataphoretic epoxy coating on aluminium alloy AA6060 modified with electrodeposited Ce-based coatings: Effect of post-treatment. in Progress in Organic Coatings. 2015;79:43-52.
doi:10.1016/j.porgcoat.2014.10.014 .

Živković, Ljiljana, Bajat, Jelena B., Popić, Jovan P., Jegdić, Bore V., Stevanović, Sanja, Mišković-Stanković, Vesna B., "Protective properties of cataphoretic epoxy coating on aluminium alloy AA6060 modified with electrodeposited Ce-based coatings: Effect of post-treatment" in Progress in Organic Coatings, 79 (2015):43-52,
https://doi.org/10.1016/j.porgcoat.2014.10.014 . .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Cvijović, Zorica M.
AU  - Bajat, Jelena B.
AU  - Rakin, Marko P.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5977
AB  - The electrochemical behaviour of the Ti-13Nb-13Zr and Ti-6Al-4V ELI alloys with martensitic microstructures was investigated by polarization and electrochemical impedance spectroscopy (EIS) in Ringers solution. The impedance spectra were interpreted by a two time-constants equivalent circuit. Both investigated alloys showed high corrosion resistance, but the thin and uniform passive film on the Ti-6Al-4V ELI alloy surface was more protective. The inner barrier and outer porous layer were highly resistant and capacitive. However, thicker and more porous passive film on the Ti-13Nb-13Zr alloy surface may be beneficial for osteointegration. The suitable thermomechanical processing improved the corrosion resistance of Ti-13Nb-13Zr alloy. (c) 2014 Elsevier Ltd. All rights reserved.
T2  - Corrosion Science
T1  - Composition and processing effects on the electrochemical characteristics of biomedical titanium alloys
VL  - 83
SP  - 245
EP  - 254
DO  - 10.1016/j.corsci.2014.02.017
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Cvijović, Zorica M. and Bajat, Jelena B. and Rakin, Marko P.",
year = "2014",
abstract = "The electrochemical behaviour of the Ti-13Nb-13Zr and Ti-6Al-4V ELI alloys with martensitic microstructures was investigated by polarization and electrochemical impedance spectroscopy (EIS) in Ringers solution. The impedance spectra were interpreted by a two time-constants equivalent circuit. Both investigated alloys showed high corrosion resistance, but the thin and uniform passive film on the Ti-6Al-4V ELI alloy surface was more protective. The inner barrier and outer porous layer were highly resistant and capacitive. However, thicker and more porous passive film on the Ti-13Nb-13Zr alloy surface may be beneficial for osteointegration. The suitable thermomechanical processing improved the corrosion resistance of Ti-13Nb-13Zr alloy. (c) 2014 Elsevier Ltd. All rights reserved.",
journal = "Corrosion Science",
title = "Composition and processing effects on the electrochemical characteristics of biomedical titanium alloys",
volume = "83",
pages = "245-254",
doi = "10.1016/j.corsci.2014.02.017"
}

Cvijović-Alagić, I., Cvijović, Z. M., Bajat, J. B.,& Rakin, M. P.. (2014). Composition and processing effects on the electrochemical characteristics of biomedical titanium alloys. in Corrosion Science, 83, 245-254.
https://doi.org/10.1016/j.corsci.2014.02.017

Cvijović-Alagić I, Cvijović ZM, Bajat JB, Rakin MP. Composition and processing effects on the electrochemical characteristics of biomedical titanium alloys. in Corrosion Science. 2014;83:245-254.
doi:10.1016/j.corsci.2014.02.017 .

Cvijović-Alagić, Ivana, Cvijović, Zorica M., Bajat, Jelena B., Rakin, Marko P., "Composition and processing effects on the electrochemical characteristics of biomedical titanium alloys" in Corrosion Science, 83 (2014):245-254,
https://doi.org/10.1016/j.corsci.2014.02.017 . .

TY  - JOUR
AU  - Živković, Ljiljana
AU  - Popić, Jovan P.
AU  - Jegdić, Bore V.
AU  - Dohcevic-Mitrovic, Z.
AU  - Bajat, Jelena B.
AU  - Miskovic-Stankovic, V. B.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5902
AB  - Among potential replacements for chromates, cerium-based conversion coatings (CeCCs) have been identified as leading candidates, showing a good promise as environmentally compliant corrosion inhibitors on Al alloys. In this work, CeCCs were synthesized on M6060 by electrolytic deposition (ELD), a well-suited method for the fabrication of films with controllable properties, at low processing temperature and cost. The CeCCs were deposited at room temperature from Ce(NO3)(3) solution, applying different cathodic potentials (-1.1, -1.4 and -1.6 V vs. SCE) for different deposition times between 5 and 20 min. Structural, morphological and compositional properties of the films were characterized by X-ray diffraction, Raman spectroscopy and scanning electron microscopy coupled with energy dispersive spectroscopy. Ceria films were nanostructured, exhibiting a cubic fluorite structure. From corrosion perspective, the quality of CeCCs was evaluated in 0.5 M NaCI solution via electrochemical impedance spectroscopy and linear sweep voltammetry. As shown, the coating corrosion quality is the interplay between deposition potential and deposition time. The highest potential led to highly cracked films of poor adherence, even at the shortest deposition time, which disqualified them from any corrosion protection application. The lowest potential (-1.1 V) produced crack-free coatings, but longer times ( GT = 10 min) were needed to provide the protective layer formation. The best corrosion protection offered CeCCs prepared at -1.4 V. The highest R-p (582 k Omega cm(2)) and the smallest CPE (12.6 . 10(-6) s(n) Omega(-1) cm) were obtained at 20 min deposition time. However, from economical point of view, 10 min deposition is a promising choice. These CeCCs also improved pitting corrosion resistance owing to homogeneous microstructure and sufficient thickness. (C) 2013 Elsevier B.V. All rights reserved.
T2  - Surface and Coatings Technology
T1  - Corrosion study of ceria coatings on AA6060 aluminum alloy obtained by cathodic electrodeposition: Effect of deposition potential
VL  - 240
SP  - 327
EP  - 335
DO  - 10.1016/j.surfcoat.2013.12.048
ER  - 

@article{
author = "Živković, Ljiljana and Popić, Jovan P. and Jegdić, Bore V. and Dohcevic-Mitrovic, Z. and Bajat, Jelena B. and Miskovic-Stankovic, V. B.",
year = "2014",
abstract = "Among potential replacements for chromates, cerium-based conversion coatings (CeCCs) have been identified as leading candidates, showing a good promise as environmentally compliant corrosion inhibitors on Al alloys. In this work, CeCCs were synthesized on M6060 by electrolytic deposition (ELD), a well-suited method for the fabrication of films with controllable properties, at low processing temperature and cost. The CeCCs were deposited at room temperature from Ce(NO3)(3) solution, applying different cathodic potentials (-1.1, -1.4 and -1.6 V vs. SCE) for different deposition times between 5 and 20 min. Structural, morphological and compositional properties of the films were characterized by X-ray diffraction, Raman spectroscopy and scanning electron microscopy coupled with energy dispersive spectroscopy. Ceria films were nanostructured, exhibiting a cubic fluorite structure. From corrosion perspective, the quality of CeCCs was evaluated in 0.5 M NaCI solution via electrochemical impedance spectroscopy and linear sweep voltammetry. As shown, the coating corrosion quality is the interplay between deposition potential and deposition time. The highest potential led to highly cracked films of poor adherence, even at the shortest deposition time, which disqualified them from any corrosion protection application. The lowest potential (-1.1 V) produced crack-free coatings, but longer times ( GT = 10 min) were needed to provide the protective layer formation. The best corrosion protection offered CeCCs prepared at -1.4 V. The highest R-p (582 k Omega cm(2)) and the smallest CPE (12.6 . 10(-6) s(n) Omega(-1) cm) were obtained at 20 min deposition time. However, from economical point of view, 10 min deposition is a promising choice. These CeCCs also improved pitting corrosion resistance owing to homogeneous microstructure and sufficient thickness. (C) 2013 Elsevier B.V. All rights reserved.",
journal = "Surface and Coatings Technology",
title = "Corrosion study of ceria coatings on AA6060 aluminum alloy obtained by cathodic electrodeposition: Effect of deposition potential",
volume = "240",
pages = "327-335",
doi = "10.1016/j.surfcoat.2013.12.048"
}

Živković, L., Popić, J. P., Jegdić, B. V., Dohcevic-Mitrovic, Z., Bajat, J. B.,& Miskovic-Stankovic, V. B.. (2014). Corrosion study of ceria coatings on AA6060 aluminum alloy obtained by cathodic electrodeposition: Effect of deposition potential. in Surface and Coatings Technology, 240, 327-335.
https://doi.org/10.1016/j.surfcoat.2013.12.048

Živković L, Popić JP, Jegdić BV, Dohcevic-Mitrovic Z, Bajat JB, Miskovic-Stankovic VB. Corrosion study of ceria coatings on AA6060 aluminum alloy obtained by cathodic electrodeposition: Effect of deposition potential. in Surface and Coatings Technology. 2014;240:327-335.
doi:10.1016/j.surfcoat.2013.12.048 .

Živković, Ljiljana, Popić, Jovan P., Jegdić, Bore V., Dohcevic-Mitrovic, Z., Bajat, Jelena B., Miskovic-Stankovic, V. B., "Corrosion study of ceria coatings on AA6060 aluminum alloy obtained by cathodic electrodeposition: Effect of deposition potential" in Surface and Coatings Technology, 240 (2014):327-335,
https://doi.org/10.1016/j.surfcoat.2013.12.048 . .

TY  - JOUR
AU  - Popić, Jovan P.
AU  - Jegdić, Bore V.
AU  - Bajat, Jelena B.
AU  - Mitrić, Miodrag
AU  - Mišković-Stanković, Vesna B.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5296
AB  - In this study, the effect of deposition time and concentration of NaNO2 in the phosphate bath on the surface morphology of iron-phosphate coatings on low carbon steel was investigated using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The composition of iron-phosphate coatings was determined using energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD), while surface coverage was evaluated by the voltammetric anodic dissolution (VAD) technique in the borate solution. The addition of NaNO2 to the phosphate bath significantly increased the surface coverage since better packed crystals of smaller size, which favour the phosphate nucleation, were obtained. It was also shown that prolonged deposition time increased the surface coverage, coating roughness and crystal size in the lateral direction, altering also the crystal shape from large platelets non-uniformly distributed on the steel surface during the initial time to better-packed laminated and needle-like structures during prolonged exposure.
T2  - Journal of the Serbian Chemical Society
T1  - Determination of surface coverage of iron-phosphate coatings on steel using the voltammetric anodic dissolution technique
VL  - 78
IS  - 1
SP  - 101
EP  - 114
DO  - 10.2298/JSC120706096P
ER  - 

@article{
author = "Popić, Jovan P. and Jegdić, Bore V. and Bajat, Jelena B. and Mitrić, Miodrag and Mišković-Stanković, Vesna B.",
year = "2013",
abstract = "In this study, the effect of deposition time and concentration of NaNO2 in the phosphate bath on the surface morphology of iron-phosphate coatings on low carbon steel was investigated using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The composition of iron-phosphate coatings was determined using energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD), while surface coverage was evaluated by the voltammetric anodic dissolution (VAD) technique in the borate solution. The addition of NaNO2 to the phosphate bath significantly increased the surface coverage since better packed crystals of smaller size, which favour the phosphate nucleation, were obtained. It was also shown that prolonged deposition time increased the surface coverage, coating roughness and crystal size in the lateral direction, altering also the crystal shape from large platelets non-uniformly distributed on the steel surface during the initial time to better-packed laminated and needle-like structures during prolonged exposure.",
journal = "Journal of the Serbian Chemical Society",
title = "Determination of surface coverage of iron-phosphate coatings on steel using the voltammetric anodic dissolution technique",
volume = "78",
number = "1",
pages = "101-114",
doi = "10.2298/JSC120706096P"
}

Popić, J. P., Jegdić, B. V., Bajat, J. B., Mitrić, M.,& Mišković-Stanković, V. B.. (2013). Determination of surface coverage of iron-phosphate coatings on steel using the voltammetric anodic dissolution technique. in Journal of the Serbian Chemical Society, 78(1), 101-114.
https://doi.org/10.2298/JSC120706096P

Popić JP, Jegdić BV, Bajat JB, Mitrić M, Mišković-Stanković VB. Determination of surface coverage of iron-phosphate coatings on steel using the voltammetric anodic dissolution technique. in Journal of the Serbian Chemical Society. 2013;78(1):101-114.
doi:10.2298/JSC120706096P .

Popić, Jovan P., Jegdić, Bore V., Bajat, Jelena B., Mitrić, Miodrag, Mišković-Stanković, Vesna B., "Determination of surface coverage of iron-phosphate coatings on steel using the voltammetric anodic dissolution technique" in Journal of the Serbian Chemical Society, 78, no. 1 (2013):101-114,
https://doi.org/10.2298/JSC120706096P . .

TY  - JOUR
AU  - Jegdić, Bore V.
AU  - Živković, Ljiljana
AU  - Popić, Jovan P.
AU  - Bajat, Jelena B.
AU  - Mišković-Stanković, Vesna B.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5616
AB  - Dip-immersion is a simple and cost-effective method for the preparation of Ce-based conversion coatings (CeCCs), a promising alternative to toxic chromate coatings, on metal substrates. In this work, CeCCs were prepared on Al-alloy AA6060 from an aqueous solution of cerium chloride at room temperature. The effect of immersion time and post-treatment in phosphate solution on the microstructure and corrosion properties of the coatings was studied. The longer the immersion time was, the thicker but more non-homogeneous and cracked were the CeCCs. The post-treatment contributed to a sealing of the cracks, as proven by an increase in the corrosion resistance compared with the as-deposited coatings. The CeCCs prepared at longer deposition times and post-treated showed much better corrosion protection than those prepared at shorter deposition, times. A detailed electrochemical impedance spectroscopy (EIS) study was undertaken to follow the evolution of the corrosion behaviour of the CeCCs with time of exposure to an aggressive chloride environment (3.5 % NaCl). For the sake of comparison, the EIS properties of bare AA6060 were also investigated. Linear voltammetry was performed to complete the study. The results confirmed the formation of protective CeCCs on the surface of AA6060. However, even CeCCs prepared at longer deposition times and post-treated provided short term protection in the aggressive environment, due to the small thickness of the coating.
T2  - Journal of the Serbian Chemical Society
T1  - Electrochemical methods for corrosion testing of Ce-based coatings prepared on AA6060 alloy by the dip immersion method
VL  - 78
IS  - 7
SP  - 997
EP  - 1011
DO  - 10.2298/JSC121212009J
ER  - 

@article{
author = "Jegdić, Bore V. and Živković, Ljiljana and Popić, Jovan P. and Bajat, Jelena B. and Mišković-Stanković, Vesna B.",
year = "2013",
abstract = "Dip-immersion is a simple and cost-effective method for the preparation of Ce-based conversion coatings (CeCCs), a promising alternative to toxic chromate coatings, on metal substrates. In this work, CeCCs were prepared on Al-alloy AA6060 from an aqueous solution of cerium chloride at room temperature. The effect of immersion time and post-treatment in phosphate solution on the microstructure and corrosion properties of the coatings was studied. The longer the immersion time was, the thicker but more non-homogeneous and cracked were the CeCCs. The post-treatment contributed to a sealing of the cracks, as proven by an increase in the corrosion resistance compared with the as-deposited coatings. The CeCCs prepared at longer deposition times and post-treated showed much better corrosion protection than those prepared at shorter deposition, times. A detailed electrochemical impedance spectroscopy (EIS) study was undertaken to follow the evolution of the corrosion behaviour of the CeCCs with time of exposure to an aggressive chloride environment (3.5 % NaCl). For the sake of comparison, the EIS properties of bare AA6060 were also investigated. Linear voltammetry was performed to complete the study. The results confirmed the formation of protective CeCCs on the surface of AA6060. However, even CeCCs prepared at longer deposition times and post-treated provided short term protection in the aggressive environment, due to the small thickness of the coating.",
journal = "Journal of the Serbian Chemical Society",
title = "Electrochemical methods for corrosion testing of Ce-based coatings prepared on AA6060 alloy by the dip immersion method",
volume = "78",
number = "7",
pages = "997-1011",
doi = "10.2298/JSC121212009J"
}

Jegdić, B. V., Živković, L., Popić, J. P., Bajat, J. B.,& Mišković-Stanković, V. B.. (2013). Electrochemical methods for corrosion testing of Ce-based coatings prepared on AA6060 alloy by the dip immersion method. in Journal of the Serbian Chemical Society, 78(7), 997-1011.
https://doi.org/10.2298/JSC121212009J

Jegdić BV, Živković L, Popić JP, Bajat JB, Mišković-Stanković VB. Electrochemical methods for corrosion testing of Ce-based coatings prepared on AA6060 alloy by the dip immersion method. in Journal of the Serbian Chemical Society. 2013;78(7):997-1011.
doi:10.2298/JSC121212009J .

Jegdić, Bore V., Živković, Ljiljana, Popić, Jovan P., Bajat, Jelena B., Mišković-Stanković, Vesna B., "Electrochemical methods for corrosion testing of Ce-based coatings prepared on AA6060 alloy by the dip immersion method" in Journal of the Serbian Chemical Society, 78, no. 7 (2013):997-1011,
https://doi.org/10.2298/JSC121212009J . .

TY  - JOUR
AU  - Živković, Ljiljana
AU  - Jegdić, Bore V.
AU  - Popić, Jovan P.
AU  - Bajat, Jelena B.
AU  - Mišković-Stanković, Vesna B.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5641
AB  - Cerium-based conversion coatings (CeCCs) are one of the most prospective alternatives to the widely used chromate conversion coatings (CCCs) due to their anticorrosion efficiency, environmentally friendly nature and low cost. In this work, the CeCCs on AA6060 were prepared by immersion into aqueous cerium salt solutions at room temperature, and subsequently post-treated in heated phosphate solution. The effect of counter ion (nitrate and chloride) on the coating properties was studied testing CeCCs as sole or conversion layers for the top polyester coating. Since the 60 mu m thick polyester coating was applied, an artificial defect of 0.8 mm hole was introduced to faster assess the differences between pretreatments. The system with CCC pretreatment was used as reference. Corrosion properties were investigated in 0.5 M NaCl solution by electrochemical impedance spectroscopy while the adhesion strength was measured by NMPR (N-methyl-2-pyrrolidone) and pull-off tests. As shown, the post-treated chloride-based CeCC offered better protection than crack-free thin nitrate-based CeCC, when used as sole coatings. On the other hand, it was brought to evidence that in combination with top powder polyester coating, the CeCC deposited from nitrate solution exhibited better protection compared to protective system pretreated with chloride-based one. Excellent polyester coating adhesion was found independently on aluminium surface pretreatment. (C) 2013 Elsevier B.V. All rights reserved.
T2  - Progress in Organic Coatings
T1  - The influence of Ce-based coatings as pretreatments on corrosion stability of top powder polyester coating on AA6060
VL  - 76
IS  - 10
SP  - 1387
EP  - 1395
DO  - 10.1016/j.porgcoat.2013.04.017
ER  - 

@article{
author = "Živković, Ljiljana and Jegdić, Bore V. and Popić, Jovan P. and Bajat, Jelena B. and Mišković-Stanković, Vesna B.",
year = "2013",
abstract = "Cerium-based conversion coatings (CeCCs) are one of the most prospective alternatives to the widely used chromate conversion coatings (CCCs) due to their anticorrosion efficiency, environmentally friendly nature and low cost. In this work, the CeCCs on AA6060 were prepared by immersion into aqueous cerium salt solutions at room temperature, and subsequently post-treated in heated phosphate solution. The effect of counter ion (nitrate and chloride) on the coating properties was studied testing CeCCs as sole or conversion layers for the top polyester coating. Since the 60 mu m thick polyester coating was applied, an artificial defect of 0.8 mm hole was introduced to faster assess the differences between pretreatments. The system with CCC pretreatment was used as reference. Corrosion properties were investigated in 0.5 M NaCl solution by electrochemical impedance spectroscopy while the adhesion strength was measured by NMPR (N-methyl-2-pyrrolidone) and pull-off tests. As shown, the post-treated chloride-based CeCC offered better protection than crack-free thin nitrate-based CeCC, when used as sole coatings. On the other hand, it was brought to evidence that in combination with top powder polyester coating, the CeCC deposited from nitrate solution exhibited better protection compared to protective system pretreated with chloride-based one. Excellent polyester coating adhesion was found independently on aluminium surface pretreatment. (C) 2013 Elsevier B.V. All rights reserved.",
journal = "Progress in Organic Coatings",
title = "The influence of Ce-based coatings as pretreatments on corrosion stability of top powder polyester coating on AA6060",
volume = "76",
number = "10",
pages = "1387-1395",
doi = "10.1016/j.porgcoat.2013.04.017"
}

Živković, L., Jegdić, B. V., Popić, J. P., Bajat, J. B.,& Mišković-Stanković, V. B.. (2013). The influence of Ce-based coatings as pretreatments on corrosion stability of top powder polyester coating on AA6060. in Progress in Organic Coatings, 76(10), 1387-1395.
https://doi.org/10.1016/j.porgcoat.2013.04.017

Živković L, Jegdić BV, Popić JP, Bajat JB, Mišković-Stanković VB. The influence of Ce-based coatings as pretreatments on corrosion stability of top powder polyester coating on AA6060. in Progress in Organic Coatings. 2013;76(10):1387-1395.
doi:10.1016/j.porgcoat.2013.04.017 .

Živković, Ljiljana, Jegdić, Bore V., Popić, Jovan P., Bajat, Jelena B., Mišković-Stanković, Vesna B., "The influence of Ce-based coatings as pretreatments on corrosion stability of top powder polyester coating on AA6060" in Progress in Organic Coatings, 76, no. 10 (2013):1387-1395,
https://doi.org/10.1016/j.porgcoat.2013.04.017 . .

TY  - JOUR
AU  - Bucko, M.
AU  - Rogan, Jelena R.
AU  - Jokić, Bojan M.
AU  - Mitrić, Miodrag
AU  - Lacnjevac, U.
AU  - Bajat, Jelena B.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5548
AB  - The Zn-Mn alloy electrodeposition on a steel electrode in chloride electrolyte was investigated with the aim of obtaining deposits with as high as possible Mn percent. It was found that the deposition current density and concentration of Mn2+ ion in the chloride electrolyte significantly affect the Mn content in the alloy coating as well as the coating surface morphology. There was a transition from dendritic and spongy to smooth, bright, and amorphous structure of Zn-Mn deposits, when some critical deposition current density was reached, probably due to the metal oxyhydroxide inclusion in the coatings. Several plating additives were tested in order to decrease the hydroxide content and to improve surface appearance of the deposits. The 4-hydroxy-benzaldehyde was found to decrease oxygen and increase Mn percent in the coatings, and to significantly improve their surface morphology.
T2  - Journal of Solid State Electrochemistry
T1  - Electrodeposition of Zn-Mn alloys at high current densities from chloride electrolyte
VL  - 17
IS  - 5
SP  - 1409
EP  - 1419
DO  - 10.1007/s10008-013-2004-8
ER  - 

@article{
author = "Bucko, M. and Rogan, Jelena R. and Jokić, Bojan M. and Mitrić, Miodrag and Lacnjevac, U. and Bajat, Jelena B.",
year = "2013",
abstract = "The Zn-Mn alloy electrodeposition on a steel electrode in chloride electrolyte was investigated with the aim of obtaining deposits with as high as possible Mn percent. It was found that the deposition current density and concentration of Mn2+ ion in the chloride electrolyte significantly affect the Mn content in the alloy coating as well as the coating surface morphology. There was a transition from dendritic and spongy to smooth, bright, and amorphous structure of Zn-Mn deposits, when some critical deposition current density was reached, probably due to the metal oxyhydroxide inclusion in the coatings. Several plating additives were tested in order to decrease the hydroxide content and to improve surface appearance of the deposits. The 4-hydroxy-benzaldehyde was found to decrease oxygen and increase Mn percent in the coatings, and to significantly improve their surface morphology.",
journal = "Journal of Solid State Electrochemistry",
title = "Electrodeposition of Zn-Mn alloys at high current densities from chloride electrolyte",
volume = "17",
number = "5",
pages = "1409-1419",
doi = "10.1007/s10008-013-2004-8"
}

Bucko, M., Rogan, J. R., Jokić, B. M., Mitrić, M., Lacnjevac, U.,& Bajat, J. B.. (2013). Electrodeposition of Zn-Mn alloys at high current densities from chloride electrolyte. in Journal of Solid State Electrochemistry, 17(5), 1409-1419.
https://doi.org/10.1007/s10008-013-2004-8

Bucko M, Rogan JR, Jokić BM, Mitrić M, Lacnjevac U, Bajat JB. Electrodeposition of Zn-Mn alloys at high current densities from chloride electrolyte. in Journal of Solid State Electrochemistry. 2013;17(5):1409-1419.
doi:10.1007/s10008-013-2004-8 .

Bucko, M., Rogan, Jelena R., Jokić, Bojan M., Mitrić, Miodrag, Lacnjevac, U., Bajat, Jelena B., "Electrodeposition of Zn-Mn alloys at high current densities from chloride electrolyte" in Journal of Solid State Electrochemistry, 17, no. 5 (2013):1409-1419,
https://doi.org/10.1007/s10008-013-2004-8 . .

TY  - JOUR
AU  - Bobić, Biljana M.
AU  - Bajat, Jelena B.
AU  - Aćimović-Pavlović, Zagorka
AU  - Bobić, Ilija
AU  - Jegdić, Bore V.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5663
AB  - The influence of corrosion on the microstructure of thixoformed and heat-treated ZA27 alloys was investigated. The microstructure of ZA27 alloy was affected by heat treatment. The process of electrochemical corrosion occurs in both ZA27 alloys through the area of eta phase. According to the results of immersion test and electrochemical measurements, the corrosion rate of the thixoformed ZA27 alloy is at least 50% lower than that of the thixoformed and thermally processed alloy. This indicates the unfavourable influence of applied heat treatment (T4 regime) on the corrosion resistance of the thixoformed ZA27 alloy.
T2  - Transactions of Nonferrous Metals Society of China
T1  - Corrosion behaviour of thixoformed and heat-treated ZA27 alloys in NaCl solution
VL  - 23
IS  - 4
SP  - 931
EP  - 941
DO  - 10.1016/S1003-6326(13)62550-9
ER  - 

@article{
author = "Bobić, Biljana M. and Bajat, Jelena B. and Aćimović-Pavlović, Zagorka and Bobić, Ilija and Jegdić, Bore V.",
year = "2013",
abstract = "The influence of corrosion on the microstructure of thixoformed and heat-treated ZA27 alloys was investigated. The microstructure of ZA27 alloy was affected by heat treatment. The process of electrochemical corrosion occurs in both ZA27 alloys through the area of eta phase. According to the results of immersion test and electrochemical measurements, the corrosion rate of the thixoformed ZA27 alloy is at least 50% lower than that of the thixoformed and thermally processed alloy. This indicates the unfavourable influence of applied heat treatment (T4 regime) on the corrosion resistance of the thixoformed ZA27 alloy.",
journal = "Transactions of Nonferrous Metals Society of China",
title = "Corrosion behaviour of thixoformed and heat-treated ZA27 alloys in NaCl solution",
volume = "23",
number = "4",
pages = "931-941",
doi = "10.1016/S1003-6326(13)62550-9"
}

Bobić, B. M., Bajat, J. B., Aćimović-Pavlović, Z., Bobić, I.,& Jegdić, B. V.. (2013). Corrosion behaviour of thixoformed and heat-treated ZA27 alloys in NaCl solution. in Transactions of Nonferrous Metals Society of China, 23(4), 931-941.
https://doi.org/10.1016/S1003-6326(13)62550-9

Bobić BM, Bajat JB, Aćimović-Pavlović Z, Bobić I, Jegdić BV. Corrosion behaviour of thixoformed and heat-treated ZA27 alloys in NaCl solution. in Transactions of Nonferrous Metals Society of China. 2013;23(4):931-941.
doi:10.1016/S1003-6326(13)62550-9 .

Bobić, Biljana M., Bajat, Jelena B., Aćimović-Pavlović, Zagorka, Bobić, Ilija, Jegdić, Bore V., "Corrosion behaviour of thixoformed and heat-treated ZA27 alloys in NaCl solution" in Transactions of Nonferrous Metals Society of China, 23, no. 4 (2013):931-941,
https://doi.org/10.1016/S1003-6326(13)62550-9 . .

TY  - CONF
AU  - Gulicovski, Jelena J.
AU  - Bajat, Jelena B.
AU  - Mišković-Stanković, Vesna B.
AU  - Jokić, Bojan M.
AU  - Panić, Vladimir
AU  - Milonjić, Slobodan K.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7011
AB  - CeO2 coatings were formed on the aluminum after Al surface preparation, by dripping the ceria sol, previously prepared by forced hydrolysis of Ce(NO3)(4). The anticorrosive properties of ceria coatings were investigated by the electrochemical impedance spectroscopy (EIS) during the exposure to 0.03% NaCl. The morphology of the coatings was examined by the scanning electron microscopy (SEM). EIS data indicated considerably larger corrosion resistance of CeO2-coated aluminum than for bare Al. The corrosion processes on Al below CeO2 coating are subjected to more pronounced diffusion limitations in comparison to the processes below passive aluminum oxide film, as the consequence of the formation of highly compact protective coating. The results show that the deposition of ceria coatings is an effective way to improve corrosion resistance for aluminum.
T1  - Cerium Oxide as Conversion Coating for the Corrosion Protection of Aluminum
SP  - 429
EP  - 432
UR  - https://hdl.handle.net/21.15107/rcub_vinar_7011
ER  - 

@conference{
author = "Gulicovski, Jelena J. and Bajat, Jelena B. and Mišković-Stanković, Vesna B. and Jokić, Bojan M. and Panić, Vladimir and Milonjić, Slobodan K.",
year = "2012",
abstract = "CeO2 coatings were formed on the aluminum after Al surface preparation, by dripping the ceria sol, previously prepared by forced hydrolysis of Ce(NO3)(4). The anticorrosive properties of ceria coatings were investigated by the electrochemical impedance spectroscopy (EIS) during the exposure to 0.03% NaCl. The morphology of the coatings was examined by the scanning electron microscopy (SEM). EIS data indicated considerably larger corrosion resistance of CeO2-coated aluminum than for bare Al. The corrosion processes on Al below CeO2 coating are subjected to more pronounced diffusion limitations in comparison to the processes below passive aluminum oxide film, as the consequence of the formation of highly compact protective coating. The results show that the deposition of ceria coatings is an effective way to improve corrosion resistance for aluminum.",
title = "Cerium Oxide as Conversion Coating for the Corrosion Protection of Aluminum",
pages = "429-432",
url = "https://hdl.handle.net/21.15107/rcub_vinar_7011"
}

Gulicovski, J. J., Bajat, J. B., Mišković-Stanković, V. B., Jokić, B. M., Panić, V.,& Milonjić, S. K.. (2012). Cerium Oxide as Conversion Coating for the Corrosion Protection of Aluminum. , 429-432.
https://hdl.handle.net/21.15107/rcub_vinar_7011

Gulicovski JJ, Bajat JB, Mišković-Stanković VB, Jokić BM, Panić V, Milonjić SK. Cerium Oxide as Conversion Coating for the Corrosion Protection of Aluminum. 2012;:429-432.
https://hdl.handle.net/21.15107/rcub_vinar_7011 .

Gulicovski, Jelena J., Bajat, Jelena B., Mišković-Stanković, Vesna B., Jokić, Bojan M., Panić, Vladimir, Milonjić, Slobodan K., "Cerium Oxide as Conversion Coating for the Corrosion Protection of Aluminum" (2012):429-432,
https://hdl.handle.net/21.15107/rcub_vinar_7011 .