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논문 기본 정보

자료유형
학술저널
저자정보
Il Ryoung Sohn (POSCO) Tae Chul Kim (POSCO) Sung Ju Kim (POSCO) Myung Soo Kim (POSCO) Jong Sang Kim (POSTECH) Woo Jin Lim (LG electronics) Seong Mo Bae (LG electronics) Su Hee Shin (LG electronics) Doo Jin Paik (POSCO)
저널정보
한국부식방식학회 Corrosion Science and Technology CORROSION SCIENCE AND TECHNOLOGY Vol.23 No.4
발행연도
2024.8
수록면
283 - 288 (6page)
DOI
10.14773/cst.2024.23.4.283

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초록· 키워드

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Hot-dip Zn-Mg-Al coatings have a complex microstructure consisting of Zn, Al, and MgZn 2 phases. Its crystal structure depends on alloy content and cooling rates. Microstructure and corrosion resistance of these coatings might be affected by heat treatment. To investigate effect of heat treatment on microstructure and corrosion resistance of Zn-Mg-Al coatings, Zn-1.5%Mg-1.5%Al coated steel was heated up to 550 oC at a heating rate of 80 oC/s and cooled down to room temperature. At above 500 oC, the ternary phase of Zn-MgZn 2 -Al was melted down. Only Zn and MgZn 2 phases remained in the coating. Heat- and non-heat-treated specimens showed similar corrosion resistance in Salt Spray Test (SST).When a Zn-3.0%Mg-2.5%Al coated steel was subjected to heat treatment at 100 oC or 300 oC for 200 h and compared with GA and GI coated steels, the microstructure of coatings was not significantly changed at 100 oC. However, at 300oC, most Al in the coating reacted with Fe in the substrate, forming a Fe-Al compound layer in the lower part of the coating. MgZn2 was preferentially formed in the upper part of the coating. As a result of SST, Zn-Mg-Al coated steels showed excellent corrosion resistance, better than GA and GI.

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