硫酸浴からのZn-Co合金めっきの腐食挙動 Corrosion Behavior of Electroplated Zn-Co Alloys from Sulfate Solutions

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We studied corrosion by Zn-Co alloys electroplated from sulfate solutions onto iron substrate in a salt spray test (SST) by using scanning electron, X-ray diffraction, and X-ray photoelectron spectroscopy (XPS).<br>We found Zn-Co alloy surfaces corroded by SST to be covered by corrosion products (white rust) consisting of Zn(OH)<sub>2</sub>, ZnO, Zn<sub>5</sub>(CO<sub>3</sub>)<sub>2</sub>(OH)<sub>6</sub>, and ZnCl<sub>2</sub>·4Zn(OH)<sub>2</sub> due to the dissolution of Zn. For γ-phase alloys consisting of 10∼20wt%Co, a corrosion product with low electrical conductivity (ZnCl<sub>2</sub>·4Zn(OH)<sub>2</sub>) formed mainly with the corrosion product apparently effective subsequently as a barrier against further corrosion. The good corrosion resistance of γ-phase films can be attributed to conversion to a more noble-metal site due to Co concentrating on the corroded surface as corrosion advanced.

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 47(6), 524-528, 1996-06 

    The Surface Finishing Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002256568
  • 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
    3976396
  • 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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