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Mg-Ca 합금의 전기화학적 특성에 미치는 Ca 첨가량 및 열처리의 영향
이상희 ( S. H. Lee ),정동석 ( Dong Seok Chung ),박병옥 ( B. O. Park ),김용길 ( Y. G. Kim ),정하국 ( Ha Guk Jeong ),김혜성 ( Hye Sung Kim ) 한국열처리공학회 2004 熱處理工學會誌 Vol.17 No.3
N/A 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 Mg₂Ca at grain boundary. To assess the effect of heat treatment on the as-cast Mg-alloy, the specimens were heat treated at 200℃ for 2 hours under CO2 gas atmosphere. Although corrosion properties of Mg-Ca alloys are somewhat deteriorated by heat treatment at 200℃ Mg-0.22wt%Ca alloy with uniformly distributed nano-sized Mg,Ca phase in a-Mg matrix show still better corrosion properties than pure Mg specimen.