ダイカスト用亜鉛合金の大気腐食特性に及ぼす合金元素の影響 Effect of Alloying Elements on Atmospheric Corrosion Behavior of Zinc Die-Casting Alloys

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  The effect of alloying elements on the atmospheric corrosion behavior of zinc die-casting alloys was investigated using the cyclic wet and dry test which simulated a diurnal change in specimen temperature and relative humidity in an actual outdoor environment. The deposition amount of chloride ions on the specimen surface was adjusted to 1.0×10<sup>-3</sup> and 1.0 g•m<sup>-2</sup> by forming of a uniform layer of diluted synthetic seawater. The addition of aluminum and mischmetal (MM) improved the corrosion resistance of zinc die-casting alloys, while that of Cu degraded the corrosion resistance. Polarization measurements indicated that Cu addition promotes the reduction reaction of dissolved oxygen. Corrosion products formed on Cu-containing specimens also promoted the cathodic reaction. On the contrary, the corrosion products on Al-containing and MM-containing alloys had the ability to suppress the anodic reaction. The value of average corrosion depth and the composition of corrosion products in the accelerated corrosion test were compared to those obtained by atmospheric exposure tests. It was concluded that the cyclic wet and dry test, in which diluted synthetic seawater is used as a test solution, is appropriate for an accelerated atmospheric corrosion test for zinc alloys.<br>

収録刊行物

  • 日本金屬學會誌 = Journal of the Japan Institute of Metals  

    日本金屬學會誌 = Journal of the Japan Institute of Metals 72(5), 337-346, 2008-05-01 

    The Japan Institute of Metals

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各種コード

  • NII論文ID(NAID)
    10021150280
  • NII書誌ID(NCID)
    AN00062446
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00214876
  • NDL 記事登録ID
    9514293
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-314
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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