Effect of Solution Treatment at Different Temperatures on Corrosion Properties of ZK40A Magnesium Alloy
[Purposes]The poor corrosion resistance of magnesium alloy limits its practical application.Heat treatment can improve the corrosion resistance of magnesium alloy,but there are few studies on the corrosion resistance of ZK40 A magnesium alloy after heat treatment,which needs to be further strength-ened.[Methods]The corrosion properties of ZK40A magnesium alloy after solution treatment at different temperatures were studied by hydrogen evolution,weight loss and electrochemical tests.The microstruc-ture,corrosion products and corrosion morphology of the alloy were observed by OM and SEM,and the phase analysis was carried out by XRD.[Findings]After solution treatment,the inhomogeneity of the as-cast ZK40 A alloy was improved,and the recrystallization and twin structure appeared in the solid solu-tion range of 400-450℃.With the increase of solution temperature,the content of the second phase in-creases first and then decreases gradually and distributes along the grain boundary.After solution treat-ment at 450℃,the microstructure of the alloy is uniform and the corrosion resistance is the best.[Con-clusions]The solid solution treatment can effectively improve the corrosion resistance of as-cast ZK40 A,and the heat treatment temperature should be controlled at 400～450℃.
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