Tin-Silver Alloy Electrodeposition from a Concentrated Calcium Chloride Aqueous Solution and Selective Recovery of Metal Components from The Electrodeposition Bath

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  • KITADA Atsushi
    Department of Chemical System Engineering, The University of Tokyo
  • KATORI Haruki
    Department of Materials Science and Engineering, Kyoto University
  • ISHIKAWA Kai
    Department of Materials Science and Engineering, Kyoto University
  • FUKAMI Kazuhiro
    Department of Materials Science and Engineering, Kyoto University
  • MURASE Kuniaki
    Department of Materials Science and Engineering, Kyoto University

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Other Title
  • 濃厚塩化カルシウム水溶液からのスズ−銀合金電析および電析浴からの金属成分の選択的回収

Abstract

<p>A concentrated calcium chloride（CaCl2）-based electrodeposition bath was investigated for use in low-toxicity tin-silver（Sn-Ag）alloy plating processes and for facile recovery of metal components from used plating bath（s）. Flat electrodeposition was achieved using a Sn-Ag alloy electrodeposition bath: 5 mM AgCl＋195 mM SnCl2＋12 mM HCl in CaCl2･10H2O. Moreover, a simple pH adjustment and subsequent filtration removed 99% of the silver as precipitate, leaving tin in the solution. Results show that concentrated CaCl2 aqueous solutions might be used as a Sn-Ag alloy plating bath, thereby facilitating the selective recovery of metal components.</p>

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