Aging Behavior of Sensitizer of Catalyzation Pretreatment for Electroless Plating

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  • OKAMOTO Naoki
    Graduate School of Engineering, Himeji Institute of Technology Graduate School of Engineering, Tokyo Metropolitan University
  • YAE Shinji
    Graduate School of Engineering, Himeji Institute of Technology (From 1 April 2004) Graduate School of Engineering, University of Hyogo
  • YAMAGISHI Kenji
    Graduate School of Engineering, Himeji Institute of Technology Technical Support Center for Machinery and Metals Industries, Hyogo Prefectural Institute of Industrial Research
  • MITSUMATA Nobuaki
    Graduate School of Engineering, Himeji Institute of Technology
  • FUKUMURO Naoki
    Graduate School of Engineering, Himeji Institute of Technology (From 1 April 2004) Graduate School of Engineering, University of Hyogo
  • WATANABE Tohru
    Graduate School of Engineering, Tokyo Metropolitan University
  • MATSUDA Hitoshi
    Graduate School of Engineering, Himeji Institute of Technology (From 1 April 2004) Graduate School of Engineering, University of Hyogo

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Other Title
  • 無電解めっきの活性化前処理に用いられるセンシタイジング液の経時変化
  • ムデンカイメッキ ノ カッセイカ マエ ショリ ニ モチイラレル センシタイジングエキ ノ ケイジ ヘンカ

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Abstract

SnCl2 aqueous solution including HCl is used as a sensitizer of two-step catalyzation (sensitization-activation) pretreatment for electroless metal plating onto non-conducting substrates. The sensitizer is inactivated by aging. In this study, the relationships among the Sn2+ concentration of sensitizer, amount of adsorbates formed on the substrates, induction period of electroless Ni-P deposition and aging time have been investigated quantitatively. As the aging proceeded, the Sn2+ concentration decreased, while the amount of adsorbates, including Sn species formed by sensitization, increased. With the decrease of Sn2+ concentration, the amount of Pd adsorbates formed during activation decreased, and the induction period was extended. An independent investigation using mixture solutions of SnCl2 and SnCl4 gave similar results for aging. These results show that the aging of sensitizer induces the decrease of divalent Sn species and the rise of tetravalent Sn species, which is inactive for the formation of Pd adsorbates. Thus, the aging decreases the Pd adsorbates and extends the induction period.<br>

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