クロメート皮膜中におけるシリカ粒子の防食作用 An Anticorrosion Mechanism of Silica Particles in Chromate Coatings

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著者

    • 須田 新 SUDA Arata
    • 日本パーカライジング(株) 総合技術研究所 Nihon Parkerizing Co., Ltd. Cent. Res. Labs.

抄録

The adsorption-desorption behavior of Cr (<b>VI</b>) ions on the surfaces of fine silica particles was examined by atomic absorption spectrometry and by electric conductivity measurement of solutions so as to analyze an anticorrosion function of silica particles in dry-in-place chromate coatings.<br>Among chromium species, Cr (<b>VI</b>) ion shows high rate of adsorption due to coordination bonds formed with the Si atoms of silica particles. In an aqueous solution of less than pH5.5, Cr (<b>VI</b>) ions are adsorbed on the surfaces of silica particles. At pH8.5-11, desorption of already-adsorbed Cr (<b>VI</b>) ions occurs through a reaction that is mainly S<sub>N</sub>1D ligand substitution of OH<sup>-</sup> and Cr (<b>VI</b>) ions.<br>An anticorrosion mechanism of silica particles in dry-in-place chromate coatings was surmised to be as follows. In acidic regions, where metal is corroded, Cr (<b>VI</b>) ions in the chromate coating are adsorbed and fixed on the silica particles. In basic regions, Cr (<b>VI</b>) ions that were previously adsorbed are desorbed through the substitution reaction. These desorbed Cr (<b>VI</b>) ions contribute to the corrosion resistance of metal substrates as an inhibitor.

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(2), 183-188, 1996-02 

    The Surface Finishing Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002255779
  • 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
    3926768
  • 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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