Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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The Influence of Heat Treatment and Ca contents on the Electrochemical Characteristics of Mg-Ca Alloys

Mg-Ca 합금의 전기화학적 특성에 미치는 Ca 첨가량 및 열처리의 영향

  • Lee, S.H. (Dept. of Materials, Daegu Polytechnic College) ;
  • Chung, Dong-Seok (Dept. of Materials, Ulsan Polytechnic College) ;
  • Park, B.O. (Dept. of Inorganic Materials Engineering, Kyungpook National University) ;
  • Kim, Y.G. (Gyeongnam Regional Office, Small and Medium Business Administration) ;
  • Jeong, Ha-Guk (Industrial Technology Center Micro Machining Technology Team, Korea Institute of Industrial Technology) ;
  • Kim, Hye-Sung (Dept. of Materials Engineering, Miryang National University)
  • 이상희 (대구기능대학 재료과) ;
  • 정동석 (울산기능대학 재료과) ;
  • 박병옥 (경북대학교 무기재료공학과) ;
  • 김용길 (경남 중소기업청) ;
  • 정하국 (생산기술연구원 마이크로 성형팀) ;
  • 김혜성 (밀양대학교 신소재공학부)
  • Received : 2004.03.22
  • Accepted : 2004.04.21
  • Published : 2004.05.30
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Abstract

In this study, the influence of heat treatment and Ca contents on the electrochemical behavior was investigated. Mg-Ca alloys, i.e., Mg-0.22wt%Ca, Mg-0.56wt%Ca, Mg-1.31wt%Ca are prepared by ingot metallurgy. As-cast Mg-Ca alloys exhibited better electrochemical properties than pure Mg. Especially, Mg-0.22wt%Ca alloy improves its anode efficiency up to 62% and lowers the OCP up to -1.72VSCE. Microstructure and XRD patterns of Mg-Ca alloys show that additive Ca element is mainly solid-solutioned. While, the others show the microstructure and XRD pattern with large $Mg_2Ca$ at grain boundary. To assess the effect of heat treatment on the as-cast Mg-alloy, the specimens were heat treated at $200^{\circ}C$ for 2 hours under $CO_2$ gas atmosphere. Although corrosion properties of Mg-Ca alloys are somewhat deteriorated by heat treatment at $200^{\circ}C$ Mg-0.22wt%Ca alloy with uniformly distributed nano-sized $Mg_2Ca$ phase in ${\alpha}$-Mg matrix show still better corrosion properties than pure Mg specimen.

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References

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