Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Solution Treatment on Corrosion Behavior of AZ91-2%Ca Magnesium Casting Alloy

주조용 AZ91-2%Ca 마그네슘 합금의 부식 거동에 미치는 용체화처리의 영향

  • Moon, Jung-Hyun (Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology) ;
  • Jun, Joong-Hwan (Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology)
  • 문정현 (한국생산기술연구원 융합공정신소재그룹) ;
  • 전중환 (한국생산기술연구원 융합공정신소재그룹)
  • Received : 2015.05.26
  • Accepted : 2015.06.11
  • Published : 2015.07.31
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Abstract

The study is intended to investigate the effect of solution treatment on microstructure and corrosion behavior of AZ91(Mg-9%Al-1%Zn-0.3%Mn)-2%Ca casting alloy. In as-cast state, the AZ91-2%Ca alloy consisted of intermetallic ${\beta}(Mg_{17}Al_{12})$, $Al_8Mn_5$ and $Al_2Ca$ phases in ${\alpha}-(Mg)$ matrix. After the solution treatment, Al within the ${\alpha}-(Mg)$ matrix was distributed more homogeneously, along with the slight decrease in the total amount of intermetallic compounds. The corrosion resistance of the AZ91-2%Ca alloy was improved after the solution treatment. The microstructural examinations for the solution-treated samples revealed that the better corrosion resistance may well be related to the incorporation of more oxides and hydroxides such as $Al_2O_3$, $Al(OH)_3$, CaO and $Ca(OH)_2$ into the surface corrosion product without dissolution of the intermetallic phases along the grain boundaries.

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References

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