Electrodeposition behavior of Zn-Co alloy from alkaline zincate solution containing triethanolamine

Hiroaki Nakano, Shitoku Shibata, Shingo Arakawa, Satoshi Oue, Shigeo Kobayashi

    研究成果: Contribution to journalArticle査読

    抄録

    Synopsis: Electrodeposition behavior of Zn-Co alloys was investigated at current densities of 2-500 A·m-2 and a charge of 5 × 104 C·m-2 in an unagitated zincate solution containing triethanolamine, which forms a stable complex with Co2+ ions at 308 K. At low current densities below 5 A·m-2, the Zn-Co alloy exhibited normal codeposition, wherein electrochemically more noble Co deposited preferentially, while at high current densities above 6 A·m-2, it exhibited anomalous codeposition, wherein less noble Zn deposited preferentially. The current efficiency for Zn-Co alloy deposition was low to be about 20% in the region of nomal codeposition at low current densities, while it was 95% in the region of anomalous codeposition at high current densities. In the region of anomalous codeposition at high current densities, the partial polarization curves for Co deposition and H2 evolution were significantly shifted to less noble direction by coexisting of Zn 2+ ions, showing the formation of an inhibitor for deposition, which results from Zn2+ ions in the cathode layer. In contrast, in the region of normal codeposition at low current densities below 5 A·m -2, the underpotential deposition of Zn apparently occurred with Co. Because Zn-Co alloys are composed of the stable intermetallic compounds of CoZn13 and Co5Zn21, the activity coefficient of Zn in the deposit appears to decrease remarkably.

    本文言語英語
    ページ(範囲)346-351
    ページ数6
    ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    99
    5
    DOI
    出版ステータス出版済み - 2013

    All Science Journal Classification (ASJC) codes

    • 凝縮系物理学
    • 物理化学および理論化学
    • 金属および合金
    • 材料化学

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