Size Effect of Copper Precipitation Particles on Electrochemical Nanoscopic Galvanic Behavior in Cu-Added Ultra Low Carbon Steel

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Electrochemical polarization measurements were applied to Cu-added ultra low carbon steels aged at 773 K for duration ranging from 9×10 to 5×10<SUP>6</SUP> s to investigate size effect of copper precipitation particles on passivation of the steel. The anodic polarization curve measurements in 0.5 kmol/m<SUP>3</SUP> H<SUB>2</SUB>SO<SUB>4</SUB> solution revealed that the passive current density <I>I</I><SUB>pass</SUB> showed almost no variation until the aging process reached the overaged stage in which the Vickers hardness of the steel began to decrease. Thereafter, the <I>I</I><SUB>pass</SUB> increased monotonously with increasing aging time in the overaged stage. This increase in <I>I</I><SUB>pass</SUB> due to aging was considered to result from the preferential anodic dissolution of grown copper particles. Thus, the corrosion resistance of the Cu-added ultra low carbon steel scarcely deteriorated even if the size of copper particles increased with aging time before the maximum hardness was reached. These results reflected that there was a critical nanometer size of copper particles as a nanoscopic galvanic action beyond which a good protective passive film could not be formed.

収録刊行物

  • Materials transactions

    Materials transactions 43(6), 1348-1351, 2002-06-01

    公益社団法人 日本金属学会

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各種コード

  • NII論文ID(NAID)
    10012324410
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13459678
  • NDL 記事登録ID
    6200538
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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