1. National Innovation Center of High Speed Train, Qingdao 370214, China
2. AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
3. Aviation Materials National Innovation (Qingdao) High Speed Railway Materials Research Institute Co., Ltd,Qingdao 370214, China
4. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
et al.
This paper focuses on the stress corrosion behavior and influencing factors of aluminum alloy in marine environment, and discusses the stress corrosion mechanism of aluminum alloy in marine environment. The stress corrosion cracking (SCC) of aluminum alloy in marine environment is mainly controlled by hydrogen induced cracking and anodic dissolution process.The SCC process of aluminum alloy can be divided into four stages: aluminum alloy surface passivation film rupture and pitting stage, crack initiation stage, passivation film regeneration and dissolution dynamic equilibrium stage and crack propagation stage. The microstructure of aluminum alloy can be controlled by the alloy composition and heat treatment process, and the second phase particles in aluminum alloy play an important role in the SCC process of aluminum alloy. The SCC behavior of aluminum alloy is also affected by the temperature, pH value, ion type and concentration of marine environment. This paper summarizes the failure mechanism of stress corrosion of aluminum alloy in ocean atmosphere and seawater environment by analyzing the existence form and function of common alloying elements in aluminum alloy matrix, the influence of heat treatment process on stress corrosion behavior of aluminum alloy, and the characteristics of marine environment. It provides the basis for explaining and analyzing the mechanism of stress corrosion of aluminum alloy in marine environment.