重希土類元素を含む耐熱マグネシウム合金の耐食性 Corrosion resistance of heat resistant magnesium alloys containing heavy rare earth elements

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Mg–10 mass%Gd–3 mass%Nd–Zr alloy and Mg–10 mass%Dy–3 mass%Nd–Zr alloy have high strength at elevated temperatures and their application to automotive engine parts is expected. In this paper, the corrosion propeties of these alloys in salt solution are discussed. The corrosion properties are evaluated by immersion test in salt solution and electrochemical impedance spectroscopy (EIS). The corroded surface is also characterized by SEM and XPS analysis. From the results of immersion test, it is found that corrosion resistance of as-cast, solution-treated and peak-aged specimens of these alloys are comparable with that AZ91D which has a good corrosion resistance. From the results of EIS, it is clear that stable protective film on the surface of over-aged specimen is formed in salt solution. The surface of the protective film consists of fine needle like compounds. It is suggested that the compounds are MgO, Mg(OH)<sub>2</sub> and 3MgCO<sub>3</sub>·Mg(OH)<sub>2</sub>·3H<sub>2</sub>O stabilized by Gd or Dy from the results of XPS. The compounds play the important role as stable protection film on the surface of over-aged specimens of the examined Mg–RE alloys, and results in higher corrosion resistance of the specimens than that of an AZ91D magnesium alloy.

収録刊行物

  • 軽金属

    軽金属 46(1), 39-44, 1996-01-30

    一般社団法人 軽金属学会

参考文献:  18件中 1-18件 を表示

被引用文献:  2件中 1-2件 を表示

各種コード

  • NII論文ID(NAID)
    10003793377
  • 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
    3918063
  • 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  CJP引用  NDL  J-STAGE 
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