不同温度固溶处理对ZK40A镁合金耐腐蚀性能的影响
Effect of Solution Treatment at Different Temperatures on Corrosion Properties of ZK40A Magnesium Alloy
薛丰1
作者信息
- 1. 盐城农业科技职业学院,江苏 盐城 224001
- 折叠
摘要
[目的]镁合金耐腐蚀性差导致其在实际应用中受到限制.热处理能够改善镁合金的耐腐蚀性能,但目前对ZK40A镁合金热处理耐腐蚀性能研究较少,有待进一步加强.[方法]通过对ZK40A镁合金进行不同温度的固溶处理,分别采用析氢、失重、电化学试验等对不同温度固溶处理后的镁合金腐蚀性能进行研究.利用OM与SEM对合金组织、腐蚀产物和腐蚀形貌进行观察,并使用XRD对其进行物相分析.[结果]ZK40A在固溶处理后改善了铸态合金组织的不均匀性,在400～450℃的固溶范围内出现了再结晶和孪晶组织.随着固溶温度的升高,第二相含量先升高再逐渐减少且沿着晶界少量分布,在450℃固溶后,合金组织均匀,耐蚀性最好.[结论]固溶处理能够有效改善铸态ZK40A的耐蚀性能,热处理温度控制在400～450℃较为适宜.
Abstract
[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℃.
关键词
ZK40A/固溶温度/显微组织/耐腐蚀性能Key words
ZK40A/solution temperature/microstructure/corrosion resistance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据