Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Effect of Zn Addition on Corrosion Behavior of Mg-8%Al Casting Alloy

Mg-8%Al 주조 합금의 부식 거동에 미치는 Zn 첨가의 영향

  • Hwang, In-Je (Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology) ;
  • 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) ;
  • Kim, Young-Jig (School of Advanced Materials Science & Engineering, Sungkyunkwan University)
  • 황인제 (한국생산기술연구원 융합공정신소재그룹) ;
  • 문정현 (한국생산기술연구원 융합공정신소재그룹) ;
  • 전중환 (한국생산기술연구원 융합공정신소재그룹) ;
  • 김영직 (성균관대학교 공과대학 신소재공학부)
  • Received : 2015.04.07
  • Accepted : 2015.05.27
  • Published : 2015.06.30
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Abstract

Effects of Zn addition on the microstructure and corrosion behavior of Mg-8%Al-(0-1)%Zn casting alloys were investigated. With increasing Zn content, the amount of ${\beta}(Mg_{17}Al_{12})$ phase increased, while ${\alpha}$-(Mg) dendritic cell size became reduced. The corrosion rate decreased continuously with the increase in the Zn content. The evaluation of the microstructural evolution indicates that the improved barrier effect of ${\beta}$ particles formed more continuously along the dendritic cell boundaries and the incorporation of more ZnO into the surface corrosion product, by which the absorption of $Cl^-$ ions is impeded, are responsible for the better corrosion resistance in relation to the Zn addition.

Keywords

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