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Inhibition effect of zinc on the cathodic deposition of cobalt—II. Potentiodynamic and intensiodynamic curves in chloride solutions

✍ Scribed by J. Mindowicz; C. Capel-boute; C. Decroly

Publisher
Elsevier Science
Year
1965
Tongue
English
Weight
360 KB
Volume
10
Category
Article
ISSN
0013-4686

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✦ Synopsis

Polarization curves obtained with the potentiodynamic and intensiodynamic methods (linear variation with time of cathodic potential or current imposed by a potentiostat) have been established in buffered chloride solutions of cobalt with a gold cathode, adding different proportions of more electronegative cations and keeping the anion concentration constant.

Among all the more electronegative cations added (Ca*+-, BaZ+, SW+, Mgz+, Zne+) only Zn2+ produced a particular change in the shape of the curves, similar to that obtained in anodic passivation.

This specific effect of cathodic inhibition, blocking the discharge reaction of cobalt, has been studied in function of the Zn2+/Co2+ and in a more acid solution.

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