クエン酸アンモニウム-ヨウ化カリウム浴からのSn-Ag合金めっきにおけるアノードの挙動 Anode Behaviors in Sn-Ag Alloy Plating from Ammonium Citrate-potassium Iodide Baths

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Anodic current density-potential curves of Sn, Ag, Pt, and graphite were measured to obtain informations on the selection of anode materials in ammonium citrate-potassium iodide baths for Sn-Ag alloy plating. The Sn anode was dissolved at small overpotentials in ammonium citrate solutions containing iodide and showed a very smooth electrode surface. However, a displacement deposition of rough Ag was observed when solutions contained Ag<sup>+</sup>. The Ag anode also dissolved at small overpotentials. Nevertheless, AgI was precipitated at the anode and therefore the limiting current densities were smaller than 10mA/cm<sup>2</sup>. The main electrode reaction at the Pt and graphite anode was oxidation of iodide to form I<sub>3</sub><sup>-</sup>. This reaction also occurred at the Sn and Ag anode at high overpotentials. Sn<sup>2+</sup> species was chemically oxidized by I<sub>3</sub><sup>-</sup> formed at the anode, accumulating Sn<sup>4+</sup> species in baths. To prevent both Ag displacement deposition and anodic oxidation of iodide, the electrode potential of the anode in Sn-Ag alloy plating baths must be maintained between -0.2V and 0.4V vs. NHE.

収録刊行物

  • 表面技術 = The Journal of the Surface Finishing Society of Japan  

    表面技術 = The Journal of the Surface Finishing Society of Japan 49(12), 1316-1321, 1998-12-01 

    The Surface Finishing Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002111297
  • NII書誌ID(NCID)
    AN1005202X
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09151869
  • NDL 記事登録ID
    4624040
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-291
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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