酸素処理水中におけるクロムめっきの腐食機構 Corrosion Mechanism of Chromium Plating in Oxygenated Water

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Our study of chromium plating corrosion in oxgenated water involved three types of chromium plating on SUS 403 (13% chromium-steel): (1) conventional, (2) double-layer chromium-over-nickel plating, and (3) plating sealing with chromium oxide. Specimens were immersed in water (318K) with a 6 to 7ppm concentration of dissolved oxygen for a maximum of 180 days, during which weight changes were measured. After the test, chromium plating surface and cross section were observed. We found that conventional chromium plating corroded at microcracks, but double-layer chromium over-nickel plating and sealing chromium plating did not corrode. We therefore concluded that chromium plating corroded as follows Fe leached from the base metal due to electric potential created by the difference in concentration of dissolved oxygen inside microcracks and surface. Fe ion hydrolysis then produced acid inside microcracks. Chromium plating passivity was compromised by this acid, leaching chromium plating at microcracks.

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 48(9), 919-923, 1997-09-01 

    The Surface Finishing Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002259862
  • 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
    4304536
  • 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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