Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Corrosion Behavior of Rapidly Solidified Mg-Zn-Y Alloys in NaCl Solution

  • Izumi, Shogo (Graduate School of Science and Technology, Kumamoto University) ;
  • Yamasaki, Michiaki (Department of Materials Science and Engineering, Kumamoto University) ;
  • Sekigawa, Takahiro (Nagoya Aerospace Systems, Mitsubishi Heavy Industries, Ltd.) ;
  • Kawamura, Yoshihito (Department of Materials Science and Engineering, Kumamoto University)
  • Published : 2006.09.24
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Abstract

Compositional dependence of corrosion behavior of rapidly solidified Mg-rich Mg-Zn-Y alloys in NaCl aqueous solution has been investigated. Mg-Zn-Y ternary alloys containing small amounts of Zn exhibited low corrosion rate, although the $Mg_{98}Y_2$ (at. %) binary alloy showed severe corrosion with violet evolution of hydrogen. The alloy with highest corrosion-resistance was $Mg_{97.25}Zn_{0.75_Y_2$, its corrosion rate was about 1 mm year-1 in 0.17 M (1.0 wt. %) NaCl solution. $Mg_{97.25}Zn_{0.75}Y_2$ alloy exhibited passive region in anodic polarization curves when immersed in NaCl solution. Rapidly solidification and small amount of Zn addition may bring about an increase in electrochemical homogeneity of Mg-Zn-Y alloys, resulting in enhancement of corrosion resistance.

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