Real surface area of the aluminium electrode in sodium chloride solution
Abstract
By combining the techniques of electrochemical slow potentiodynamic, AC impedance and atomic force microscopy (AFM), ii: was shown that the differences in the anodic dissolution rates of Al in 0.5 NaCl solutions as measured experimentally in the potential region between the corrosion and pitting potential, are mainly due to differences in surface roughness of the electrodes used. It was shown that mechanical grinding and polishing of the electrode surface with emery paper (400 grit) and alumina polishing powder (diameter 0.25 mu m) can produce surfaces differing by a factor of 6 in the roughness factor Ra. By using AFM estimates of the roughness factors a true electrode capacitance of 4.63 mu C cm(-2) and thickness d(ox) approximate to 2.0 nm for the barrier layer of the surface film was estamited. The outer part of the film is porous, partly as amorphous AI(OH)(3), or crystalline bayerite (Al2O3.3H(2)O).
Keywords:
aluminium / corrosion / real surface area / oxide thicknessSource:
Journal of the Serbian Chemical Society, 1999, 64, 11, 685-693Collections
Institution/Community
VinčaTY - JOUR AU - Dražić, D. M. AU - Popić, Jovan P. AU - Rakočević, Zlatko Lj. PY - 1999 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2294 AB - By combining the techniques of electrochemical slow potentiodynamic, AC impedance and atomic force microscopy (AFM), ii: was shown that the differences in the anodic dissolution rates of Al in 0.5 NaCl solutions as measured experimentally in the potential region between the corrosion and pitting potential, are mainly due to differences in surface roughness of the electrodes used. It was shown that mechanical grinding and polishing of the electrode surface with emery paper (400 grit) and alumina polishing powder (diameter 0.25 mu m) can produce surfaces differing by a factor of 6 in the roughness factor Ra. By using AFM estimates of the roughness factors a true electrode capacitance of 4.63 mu C cm(-2) and thickness d(ox) approximate to 2.0 nm for the barrier layer of the surface film was estamited. The outer part of the film is porous, partly as amorphous AI(OH)(3), or crystalline bayerite (Al2O3.3H(2)O). T2 - Journal of the Serbian Chemical Society T1 - Real surface area of the aluminium electrode in sodium chloride solution VL - 64 IS - 11 SP - 685 EP - 693 UR - https://hdl.handle.net/21.15107/rcub_vinar_2294 ER -
@article{ author = "Dražić, D. M. and Popić, Jovan P. and Rakočević, Zlatko Lj.", year = "1999", abstract = "By combining the techniques of electrochemical slow potentiodynamic, AC impedance and atomic force microscopy (AFM), ii: was shown that the differences in the anodic dissolution rates of Al in 0.5 NaCl solutions as measured experimentally in the potential region between the corrosion and pitting potential, are mainly due to differences in surface roughness of the electrodes used. It was shown that mechanical grinding and polishing of the electrode surface with emery paper (400 grit) and alumina polishing powder (diameter 0.25 mu m) can produce surfaces differing by a factor of 6 in the roughness factor Ra. By using AFM estimates of the roughness factors a true electrode capacitance of 4.63 mu C cm(-2) and thickness d(ox) approximate to 2.0 nm for the barrier layer of the surface film was estamited. The outer part of the film is porous, partly as amorphous AI(OH)(3), or crystalline bayerite (Al2O3.3H(2)O).", journal = "Journal of the Serbian Chemical Society", title = "Real surface area of the aluminium electrode in sodium chloride solution", volume = "64", number = "11", pages = "685-693", url = "https://hdl.handle.net/21.15107/rcub_vinar_2294" }
Dražić, D. M., Popić, J. P.,& Rakočević, Z. Lj.. (1999). Real surface area of the aluminium electrode in sodium chloride solution. in Journal of the Serbian Chemical Society, 64(11), 685-693. https://hdl.handle.net/21.15107/rcub_vinar_2294
Dražić DM, Popić JP, Rakočević ZL. Real surface area of the aluminium electrode in sodium chloride solution. in Journal of the Serbian Chemical Society. 1999;64(11):685-693. https://hdl.handle.net/21.15107/rcub_vinar_2294 .
Dražić, D. M., Popić, Jovan P., Rakočević, Zlatko Lj., "Real surface area of the aluminium electrode in sodium chloride solution" in Journal of the Serbian Chemical Society, 64, no. 11 (1999):685-693, https://hdl.handle.net/21.15107/rcub_vinar_2294 .