SO_4^<2->イオンを含んだ溶液中でのアルミニウム合金の孔食成長挙動 Pitting corrosion growth characteristics of aluminum alloys in the solution containing SO_4^<2-> ion

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著者

    • 黒田 周 KURODA Shuu
    • 三菱アルミニウム(株)技術開発センター Technical development center, Mitsubishi Aluminum Co., Ltd.
    • 当摩 建 TOHMA Ken
    • 三菱アルミニウム(株)技術開発センター Technical development center, Mitsubishi Aluminum Co., Ltd.

抄録

To investigate the pitting corrosion growth rate of aluminum alloys in the solution containing SO<sub>4</sub><sup>2-</sup> ion, the immersion corrosion test and electrochemical measurements were carried out on aluminum and Al–0.4%Cu alloy clad with the liner containing Zn. In the solution containing SO<sub>4</sub><sup>2-</sup> ion the pitting corrosion could grow deeply even in the alloy having gradient of Zn concentration. While Cl<sup>-</sup> and SO<sub>4</sub><sup>2-</sup> ions concentrated into the pit, SO<sub>4</sub><sup>2-</sup> ion had little effect on electrochemical characteristics in acidified higher chloride solution. The pitting potential of aluminum became much less noble with as a little addition of Zn as 0.2%, but that of Al–Cu alloy scarcely varied in acidified higher chloride solution. As the SO<sub>4</sub><sup>2-</sup> ion had the controlling effect of pitting corrosion density, which introduced higher chloride ion concentration in a pit. Therefore, for the control of pitting corrosion growth rate the potential slope had to be sharper in the solution containing SO<sub>4</sub><sup>2-</sup> ion. Enough Zn content at surface was required to obtain better pitting corrosion resistance, especially in Al–Cu alloy.

収録刊行物

  • 軽金属  

    軽金属 48(6), 288-293, 1998-06-30 

    The Japan Institute of Light Metals

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各種コード

  • NII論文ID(NAID)
    10002664857
  • NII書誌ID(NCID)
    AN00069773
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    04515994
  • NDL 記事登録ID
    4512224
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-284
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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