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1M NaCl 용액에서 Mg(0∼6)%Zn 주조 합금의 부식 거동
황인제 ( In-je Hwang ),김영직 ( Young-jig Kim ),전중환 ( Joong-hwan Jun ) 한국주조공학회 2016 한국주조공학회지 Vol.36 No.4
The effects of the Zn content on the microstructure and corrosion behavior in 1M NaCl solution were investigated in Mg-(0~6)%Zn casting alloys. The MgZn phase was scarcely observed in the Mg-1%Zn alloy, while the Mg-(2~6)%Zn alloy consisted of メ-(Mg) and MgZn phases. With an increase in the Zn content, the amount of the MgZn phase was gradually increased. Immer-sion and electrochemical corrosion tests indicated that the Mg-1%Zn alloy had the lowest corrosion rate among the alloys, and a further increase in the Zn content resulted in the deterioration of the corrosion resistance. Microstructural examinations of the cor-roded surfaces and EIS analyses of surface corrosion films revealed that the best corrosion resistance at 1%Zn was associated with the absence of MgZn phase particles in the microstructure and the contribution of Zn element to the formation of a protective film on the surface. A micro-galvanic effect by the MgZn particles led to the increased rate of corrosion at a higher Zn content.
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Mg-8%Al 주조 합금의 부식 거동에 미치는 Zn 첨가의 영향
황인제 ( In Je Hwang ),문정현 ( Jung Hyun Moon ),전중환 ( Joong Hwan Jun ),김영직 ( Young Jig Kim ) 한국주조공학회 2015 한국주조공학회지 Vol.35 No.3
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 β(Mg17Al12) phase increased, while α-(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 β 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.
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용체화처리된 Mg-4%Zn 합금의 부식 저항성에 미치는 미량 Ca 첨가의 영향
전중환,황인제,Jun, Joong-Hwan,Hwang, In-Je 한국열처리공학회 2016 熱處理工學會誌 Vol.29 No.4
Influence of trace amount of Ca addition on the corrosion resistance was comparatively investigated in solutionized Mg-4%Zn and Mg-4%Zn-0.1%Ca alloys. In as-cast state, the alloys were characterized by primary ${\alpha}-(Mg)$ dendrite with MgZn intermetallic compound particles. After solution-treatment, both alloys consisted of single ${\alpha}-(Mg)$ phase by dissolution of the compound particles into the matrix. It was found from the immersion and electrochemical corrosion tests that the Mg-4%Zn alloy had better corrosion resistance than the Mg-4%Zn-0.1%Ca alloy. Morphological and compositional analyses on the surface corrosion products indicate that the incorporation of Ca oxide with low PBR value into the surface corrosion products would be responsible for the decreased corrosion resistance of the Ca-containing alloy.
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용체화처리된 주조용 Mg-8%Al-X%Zn 합금의 부식 거동
전중환 ( Joong Hwan Jun ),황인제 ( In Je Hwang ) 한국열처리공학회 2015 熱處理工學會誌 Vol.28 No.3
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 α-(Mg) phase microstructure by dissolution of β(Mg17Al12) phase into the α-(Mg) matrix. The H2 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 Al2O3 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. (Received ApriI 10, 2015; Revised April 20, 2015; Accepted April 28, 2015)
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용체화처리된 Mg-4%Zn 합금의 부식 저항성에 미치는 미량 Ca 첨가의 영향
전중환 ( Joong-hwan Jun ),황인제 ( In-je Hwang ) 한국열처리공학회 2016 熱處理工學會誌 Vol.26 No.2
Influence of trace amount of Ca addition on the corrosion resistance was comparatively investigated in solutionized Mg-4%Zn and Mg-4%Zn-0.1%Ca alloys. In as-cast state, the alloys were characterized by primary α-(Mg) dendrite with MgZn intermetallic compound particles. After solution-treatment, both alloys consisted of single α-(Mg) phase by dissolution of the compound particles into the matrix. It was found from the immersion and electrochemical corrosion tests that the Mg-4%Zn alloy had better corrosion resistance than the Mg-4%Zn- 0.1%Ca alloy. Morphological and compositional analyses on the surface corrosion products indicate that the incorporation of Ca oxide with low PBR value into the surface corrosion products would be responsible for the decreased corrosion resistance of the Ca-containing alloy. (Received May 6, 2016; Revised May 13, 2016; Accepted May 19, 2016)
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