Mechanism of anomalous type electrodeposition of Fe-Ni alloys from sulfate solutions

Hiroaki Nakano, Masayuki Matsuno, Satoshi Oue, Masaaki Yano, Shigeo Kobayashi, Hisaaki Fukushima

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    19 Citations (Scopus)

    Abstract

    The electrodeposition of Fe-Ni alloys was performed galvanostatically in the sulfate solutions of pH 1-3 at 40°C and the alloy deposition behavior was compared with that of Zn-iron-group metal alloys to investigate their codeposition mechanism. The deposition behavior of Fe-Ni alloy showed a typical feature of the anomalous codeposition, in which electrochemically less noble Fe deposits preferentially under most plating conditions. The anomalous codeposition behavior in Fe-Ni alloy deposition was evidently dependent on the pH buffer capacity of the solutions. This can be explained in terms of the preferential adsorption of FeOH on the deposition sites of more noble Ni due to the extremely smaller dissociation constant of FeOH + than NiOH + in the multistep reduction process of hydrated iron-group metal ions.

    Original languageEnglish
    Pages (from-to)548-554
    Number of pages7
    JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
    Volume69
    Issue number7
    DOIs
    Publication statusPublished - Jul 1 2005

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys
    • Materials Chemistry

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