深冷-固溶-时效强化真空压铸铝合金的腐蚀行为  

Corrosion behavior of a vacuum die-cast aluminum alloy strengthened by cryogenic-solution-aging treatment

作　　者：李志强 刘光磊[1] 丁冉[1] 许福海 陶诚 刘海霞[1] 程晓农[1] Li Zhiqiang;Liu Guanglei;Ding Ran;Xu Fuhai;Tao Cheng;Liu Haixia;Cheng Xiaonong(School of Materials Science and Engineering,Jiangsu University,Zhenjiang Jiangsu 212013,China;Jiangsu Minglida Technology Co.,Ltd.,Nantong Jiangsu 226602,China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]江苏铭利达科技有限公司,江苏南通226602

出　　处：《金属热处理》2025年第1期126-133,共8页Heat Treatment of Metals

基　　金：国家自然科学基金青年项目(51801076);江苏省高等学校自然科学研究面上项目(18KJB430009);江苏省博士后科研资助计划项目(1601055C);江苏大学高级人才科研启动计划(14JDG126)。

摘　　要：研究了深冷-固溶-时效处理对真空压铸铝合金微观组织、力学性能的影响及其在3.5%NaCl溶液中浸泡不同时间后的腐蚀行为。结果表明,深冷-固溶-时效处理能够有效提升真空压铸铝合金的力学性能,其抗拉强度强度由铸态的184.8 MPa提升到249.5 MPa,硬度由90.3 HV0.1提高到124.6 HV0.1,伸长率由6.3%提升到7.7%。热处理促使铝合金的α-Al相、Si相和Al_(5)FeSi相变得细小且分布均匀,在浸泡腐蚀时有利于形成更为致密、更为均匀的钝化层,间接阻碍了氯离子向铝合金内部组织的侵入。与铸态合金相比,深冷-固溶-时效后合金的腐蚀进展缓慢,耐蚀性得到显著提升。Effect of cryogenic-solution-aging treatment on microstructure and mechanical properties of a vacuum die-cast aluminium alloy and its corrosion behavior after immersion in 3.5%NaCl solution for different time were studied.The results show that the cryogenic-solution-aging treatment can effectively improve the mechanical properties of the vacuum die-cast alloy,and the tensile strength is increased from 184.8 MPa to 249.5 MPa,the hardness is increased from 90.3 HV0.1 to 124.6 HV0.1,and the elongation is increased from 6.3% to 7.7%.The cryogenic-solution-aging treatment promotes the α-Al phase,Si phase and Al_(5FeSi) phase in the aluminum alloy to become fine and distribute evenly,which is conducive to the formation of a denser and more uniform passivation layer during immersion,indirectly hindering the invasion of chloride ions into the internal structure of the aluminum alloy.Compared with the as-cast aluminum alloy,the corrosion progress of cryogenic-solution-aging treated alloy is slow,and the corrosion resistance is significantly improved.

关 键 词：真空压铸铝合金 深冷-固溶-时效处理 耐腐蚀性 浸泡时间 

分 类 号：TG146.2[一般工业技术—材料科学与工程]