Corrosion behavior of friction stir welded joints of 7050 aluminum alloy

The 7050 high-strength aluminum alloy is widely used in the manufacture of aircraft load-bearing components, rocket chamber sections, missiles and load-bearing structures of spacecraft. The aircraft always service in harsh environments, such as lightning, rain, radiation, deicing fluid, and so on. So there is high requirement for corrosion performance, especially stress corrosion cracking. However, in the specific service environment, the properties of high-strength aluminum alloy FSW joints including corrosion resistance are imperfect. Based on this, this article focused on the influence of different welding heat input on the corrosion behavior of joints.We selected different loading stresses, via the intergranular corrosion, four point bending stress corrosion text to reveal the corrosion behaviors of the high-strength aluminum alloy.The results indicated that high-strength aluminum alloy stress corrosion resistance is sensitive. Whether to optimize welding parameters or change the heat input, it is difficult to improve stress corrosion resistance by simply controlling the welding process itself.