Kinetics of the Codischarge of Nickel and Chromium Ions from Oxalate-Sulfate Solutions into an Alloy

The kinetics of individual and concurrent discharge of nickel and chromium ions from oxalate-sulfate solutions is studied. At a high cathodic potential (-1.2 V), the process of nickel deposition is sharply decelerated due to the surface passivation of the cathode with nickel oxides and the adsorptio...

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Bibliographic Details
Published in:Protection of metals 2000-11, Vol.36 (6), p.515-519
Main Authors: Edigaryan, A A, Lubnin, E N, Polukarov, Yu M
Format: Article
Language:English
Subjects:
Chromium
Chromium nickel alloys
Deceleration
Deposition
Discharge
Nickel
Nickel oxides
Surface chemistry
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Summary:The kinetics of individual and concurrent discharge of nickel and chromium ions from oxalate-sulfate solutions is studied. At a high cathodic potential (-1.2 V), the process of nickel deposition is sharply decelerated due to the surface passivation of the cathode with nickel oxides and the adsorption of organic products. During the coreduction of the ions with the formation of an alloy, the discharge rate of nickel ions is sharply decreased and the deposition of chromium is accelerated, compared to the electrodeposition of individual metals. The phenomenon observed is accounted for by a sharp decrease in the rate constant of the electrochemical reaction of nickel discharge on the surface of an alloy.[PUBLICATION ABSTRACT]
ISSN:2070-2051
0033-1732
2070-206X
1608-327X
DOI:10.1023/A:1026664724656