Corrosion Resistance of Friction Stir Welded Al–Cu–Li Alloy AA2099-T8
来源期刊：Acta Metallurgica Sinica2020年第1期
论文作者：Yan-Long Ma Hui-Bin Xu Zhao-Yuan Liang Lei Liu
文章页码：127 - 134
摘 要：In order to study the eff ect of friction stir welding（FSW） on corrosion resistance of Al–Cu–Li alloy AA2099-T8, the microstructure and microhardness of FSW joints were characterized, and then, the corrosion behavior of the FSW joints was investigated by the immersion and potentiodynamic polarization tests in a 3.5% NaCl solution at room temperature. It is indicated that the alloy was softened by FSW, with the lowest hardness appearing at the boundary between the nugget zone and the thermo-mechanically aff ected zone. When exposed to the NaCl solution, the FSW joint was characterized by shallow pits and was free of severe localized corrosion, probably due to dissolution of T 1（A 2 CuLi） phase in the FSW joint. It is suggested that further work should be carried out to evaluate the galvanic coupling eff ect between the FSW joint and the base metal, as well as the stress corrosion cracking resistance of the FSW joint.
Yan-Long Ma1,2，Hui-Bin Xu1,2，Zhao-Yuan Liang1，Lei Liu1
1. College of Materials Science and Engineering,Chongqing University of Technology2. Chongqing Municipal Engineering Research Center of Institutions of Higher Education for Special Welding Materials and Technology,Chongqing University of Technology
摘 要：In order to study the eff ect of friction stir welding（FSW） on corrosion resistance of Al–Cu–Li alloy AA2099-T8, the microstructure and microhardness of FSW joints were characterized, and then, the corrosion behavior of the FSW joints was investigated by the immersion and potentiodynamic polarization tests in a 3.5% NaCl solution at room temperature. It is indicated that the alloy was softened by FSW, with the lowest hardness appearing at the boundary between the nugget zone and the thermo-mechanically aff ected zone. When exposed to the NaCl solution, the FSW joint was characterized by shallow pits and was free of severe localized corrosion, probably due to dissolution of T 1（A 2 CuLi） phase in the FSW joint. It is suggested that further work should be carried out to evaluate the galvanic coupling eff ect between the FSW joint and the base metal, as well as the stress corrosion cracking resistance of the FSW joint.
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