Zinc-cobalt alloy electrodeposition from chloride baths

Electrodeposition of Zn-Co alloys on iron substrate from chloride baths under galvanostatic and potentiostatic conditions were carried out. Current density, temperature and cobalt percentage in the bath were found to strongly influence the composition of the deposits and their morphology. Changes in...

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Bibliographic Details
Published in:Journal of applied electrochemistry 1997-09, Vol.27 (9), p.1088-1094
Main Authors: FRATESI, R, ROVENTI, G, GIULIANI, G, TOMACHUK, C. R
Format: Article
Language:English
Subjects:
Applied sciences
Chemistry
Electrochemistry
Electrodeposition
Exact sciences and technology
General and physical chemistry
Metallic coatings
Metals. Metallurgy
Production techniques
Study of interfaces
Surface treatment
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Summary:Electrodeposition of Zn-Co alloys on iron substrate from chloride baths under galvanostatic and potentiostatic conditions were carried out. Current density, temperature and cobalt percentage in the bath were found to strongly influence the composition of the deposits and their morphology. Changes in potentials, current efficiency and partial current densities were studied. The results show that the shift in potential and in the cobalt percentage of the deposits, for a particular current density during galvanostatic electrodeposition, does not always correspond to the transition from normal to anomalous codeposition. This shift is attributed to zinc ion discharge, which passes from underpotential to thermodynamic conditions. In the range of potentials for the underpotential deposition of zinc, the electrodeposition of zinc-cobalt alloys is discussed, emphasizing the influence of the electrode potential on the composition and microstructure of the deposits.
ISSN:0021-891X
1572-8838
DOI:10.1023/A:1018494828198