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Author Sasaki, K. Y. ♦ Talbot, J. B.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ NICKEL ALLOYS ♦ ELECTROPLATING ♦ COBALT ALLOYS ♦ IRON ALLOYS ♦ PLATINUM ♦ ELECTRODEPOSITED COATINGS ♦ BINARY ALLOY SYSTEMS ♦ MATHEMATICAL MODELS ♦ MASS TRANSFER ♦ CHARGE TRANSPORT
Abstract Thin films of NiCo and CoFe have been galvanostatically electroplated onto a platinum rotating disk electrode from simple sulfate baths containing 0.5M of the more noble metal sulfate and 0.1M of the less noble metal sulfate. The experimental results are compared to those of previous studies of NiFe codeposition in order to study the anomalous codeposition behavior of the binary iron-group alloys. Comparison of the electrodeposition results indicates that codeposition of these binary alloys is not totally analogous. It was found that codeposition of NiCo and NiFe show more mass-transfer effects than does CoFe deposition within the range of current densities studied. A model of anomalous codeposition put forth previously for NiFe was applied to the electrodeposition of NiCo and CoFe to determine the extensibility of the model, which assumes metal mono hydroxides, MOH{sup +}, are the important charge-transfer species. This model was unable to characterize fully either NiCo or CoFe electrodeposition. However, with minor changes to the hydrolysis constants used in the model, the model predictions were found to agree with the data for CoFe codeposition and greatly, improve the fit for the NiCo results.
ISSN 00134651
Educational Use Research
Learning Resource Type Article
Publisher Date 1995-03-01
Publisher Place United States
Journal Journal of the Electrochemical Society
Volume Number 142
Issue Number 3


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