Electrodeposition of Sn-Cu alloys and its connecting reliability for automotive connectors

Hiroaki Nakano, Satoshi Oue, Daisuke Yoshihara, Hisaaki Fukushima, Yoshifumi Saka, Shigeru Sawada, Yasuhiro Hattori

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)


    Electrodeposition behavior of Sn-Cu alloys was investigated potentiostatically at 0.3 to - 0.7 V vs. NHE and 298 K in sulfate bath containing additives of cresol sulfonic acid, benzal acetone and nonionic alkyl polyethylene glycol ether surfactant, and the contact resistance of Sn-Cu alloys deposited on Cu connector was evaluated. Cu behaved as more noble metal than Sn, showing the typical feature of regular type codeposition. In solution containing additives, the difference of deposition potential between Cu and Sn became small because Cu deposition was suppressed by the additives. The Sn-Cu alloys deposited from solution containing additives showed smooth surface. The deposited Sn-Cu alloys were composed of Cu, Sn, Cu6Sn5 and Cu3Sn phases in accordance with the equilibrium phase diagram of binary Cu-Sn system. The contact resistance of deposited Sn-Cu alloys increased by heating at 433 K, showing no improvement of connecting reliability by plating the stable metallic compound of Cu6Sn5. The connecting reliability of connector after abrasion was better in deposited films of Sn-Cu alloys than in reflow Sn plating.

    Original languageEnglish
    Pages (from-to)61-68
    Number of pages8
    JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
    Issue number1
    Publication statusPublished - Jan 2011

    All Science Journal Classification (ASJC) codes

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


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