Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Corrosion Behavior of Solution-Treated Mg-8%Al-X%Zn Casting Alloys

용체화처리된 주조용 Mg-8%Al-X%Zn 합금의 부식 거동

  • Jun, Joong-Hwan (Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology) ;
  • Hwang, In-Je (Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology)
  • 전중환 (한국생산기술연구원 융합공정신소재그룹) ;
  • 황인제 (한국생산기술연구원 융합공정신소재그룹)
  • Received : 2015.04.10
  • Accepted : 2015.04.28
  • Published : 2015.05.31
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Abstract

The aim of this study is to investigate the effect of solution treatment on the corrosion behavior of Mg-8%Al-(0-1)%Zn casting alloys in 1M NaCl aqueous solution. After the solution treatment, all alloys showed single ${\alpha}$-(Mg) phase microstructure by dissolution of ${\beta}(Mg_{17}Al_{12})$ phase into the ${\alpha}$-(Mg) matrix. The $H_2$ evolution volume decreased with an increase in Zn content, which indicates that the addition of Zn plays a beneficial role in decreasing corrosion rate of the Mg-Al-Zn alloy in solution-treated state. The microstructural evaluations on the corrosion products and corroded surfaces after the immersion test in 1 M NaCl solution revealed that the incorporation of more $Al_2O_3$ and ZnO into the corrosion product, by which the penetration of $Cl^-$ ions is impeded, are thought to be responsible for the better corrosion resistance in relation with the Zn addition.

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References

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