The Mechanism of the Cobalt Anodic Ionization in Chloride Solution

The mechanism of the cobalt anodic ionization in 2.5 M CoCl^sub 2^ solution (pH 3.5 ± 0.2, t = 15-60°C) is studied with the use of rotating disk electrode and rotating ring-disk electrode methods. The experimental data showed that the ionization proceeds by stages, of which the first is an intermedi...

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Bibliographic Details
Published in:Protection of metals 2005-07, Vol.41 (4), p.349-353
Main Authors: Manilevich, F D, Kozin, L F, Bogdanova, A K, Danil'tsev, B I
Format: Article
Language:English
Subjects:
Oxidation
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Summary:The mechanism of the cobalt anodic ionization in 2.5 M CoCl^sub 2^ solution (pH 3.5 ± 0.2, t = 15-60°C) is studied with the use of rotating disk electrode and rotating ring-disk electrode methods. The experimental data showed that the ionization proceeds by stages, of which the first is an intermediate CoA^sub ads^ species formation (A is Cl^sup -^ or OH^sup -^), in which the cobalt oxidation state is 1+. Further CoA^sub ads^ transformation involves rapid parallel reactions of the Co^sup +^ ions electrochemical oxidation or disproportionation. An oxidation current wave was revealed at the platinum ring electrode for the species formed during the cobalt anodic ionization at the disk electrode. Judging by the wave potential, these species can be either finely dispersed elemental cobalt or the intermediate Co^sup +^ ions.[PUBLICATION ABSTRACT]
ISSN:0033-1732
2070-2051
1608-327X
2070-206X
DOI:10.1007/s11124-005-0049-5