摘要
评价了2219-CS铝合金FSW和TIG焊接头的力学性能,并采用晶间腐蚀、剥落腐蚀及电化学腐蚀方法对2219-CS铝合金FSW和TIG焊接头进行了整体及分区域腐蚀行为表征,借助光学显微镜和扫描电子显微镜分析了表面腐蚀形貌.结果表明,搅拌摩擦焊接头焊核区的细晶结构和弥散再分布的沉淀相大幅度提高了其耐腐蚀性能,热影响区中沉淀相回溶及粗化较TIG焊接头热影响区较弱,耐腐蚀性能有一定提高,搅拌摩擦焊接头的高电化学均质性宏观表现为其整体腐蚀速率的显著降低.
Mechanical performances of friction stir welding(FSW)and tungsten inert gas(TIG)welded 2219-CS aluminum alloy joints were evaluated.The macro and micro zone corrosion behaviors were characterized by intergranular corrosion,exfoliation corrosion,and electrochemical corrosion.The morphologies of corroded surfaces were analyzed with the help of optical microscopy and scanning electron microscopy.The results showed that the fine-grain microstructures and homogeneous redispersed precipitates in the weld nugget zone of friction stir welded joints greatly improved their corrosion resistance.The anti-corrosion performances of the heat affected zone of friction stir welded joints were also better than those of the fusion welded joints,which were attributed to the less redissolving and coarsening of the precipitates.The higher electrochemical homogeneity of the friction stir welded joints contributed to the significantly reduction in corrosion rate.
作者
王非凡
谢聿铭
吴会强
马飞
黄永宪
WANG Feifan;XIE Yuming;WU Huiqiang;MA Fei;HUANG Yongxian(Beijing Institute of Astronautical Systems Engineering,Beijing,100076,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,150001,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2022年第6期43-49,I0005,共8页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(U21B6004)。
关键词
铝合金
搅拌摩擦焊
熔化焊
微观组织
腐蚀
aluminum alloys
friction stir welding
fusion welding
microstructure
corrosion
