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Morphology and composition of Ni-Co alloy powders electrodeposited from ammoniacal electrolyte

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Authors
Jovic, V. D.
Jovic, B. M.
Pavlović, Miomir G.
Maksimović, Vesna
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Abstract
In this paper, the morphology and phase structure of Ni-Co powders electrodeposited from ammoniacal electrolyte are investigated as a function of alloy powder composition. Composition of the electrolyte, i.e. the ratio of Ni(2+)/Co(2+) concentration is found to influence both, the phase structure and the morphology of Ni-Co alloy powders. It is shown that the current density practically does not influence the morphology of Ni-Co alloy powders as well as alloy powder composition. At the highest ratio of the Ni(2+)/Co(2+) ions typical spongy particles were obtained. With the decrease of the Ni(2+)/Co(2+) ions ratio agglomerates of the size of about 100 mu m, composed of a large number of fern-like dendrites on their surface were obtained. At the lowest Ni(2+)/Co(2+) concentration ratio, among more dendritic particles, agglomerates typical for pure Co powder deposition were detected. It is also shown that depending on the Ni(2+)/Co(2+) ratio different types of Ni and Co codeposition could... be detected: anomalous and irregular. At the Ni(2+)/Co(2+) ions ratio higher than 1 only beta-Ni phase was detected, while at concentration ratios Ni(2+)/Co(2+) LT 1 h.c.p. alpha-Co phase together with beta-Ni phase was detected in the alloy powder deposit.

Keywords:
Ni-Co powders / fern-like dendrites / different agglomerates / f.c.c. beta-Ni phase / h.c.p. alpha-Co phase
Source:
Journal of Solid State Electrochemistry, 2006, 10, 12, 959-966

DOI: 10.1007/s10008-005-0047-1

ISSN: 1432-8488 (print)

WoS: 000240054500003

Scopus: 2-s2.0-33747871488
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http://vinar.vin.bg.ac.rs/handle/123456789/3074
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