HUANG Youwang, SUN Xiaoling, YANG Wenjin, CHEN Hui
To study the feasibility of magnesium alloys used in aerospace vehicles and its corrosion resistance, the polarization data of HTM1 (Aerospace No.1 magnesium alloy) and TC4 (titanium alloy) were firstly measured through electrochemical tests, as well as the impedance data of HTM1 specialized electrophoretic paint. Subsequently, the simulation technology with polarization data, impedance data, aging data and service environment as boundary conditions was utilized to simulate and analyze the corrosion status of different typical ultra strong and heat-resistant magnesium alloy structural components in different service environments (service environment 1 with a salt mist concentration of 0.2 mg/L, and service environment 2 with a salt mist concentration of 2 mg/L) after 5.0, 10.0 and 17.5 a of service, respectively. Results showed that during the service process in service environment 1 and service environment 2, with the extension of service life, the protective performance of the electrophoretic paint decreased, leading to a gradual enhancement of the protective effect of HTM1 on TC4. However, due to the influence of the surface protective layer of HTM1, the protective effect was limited, leading to a certain degree of corrosion of TC4. Meanwhile, the contact area of the titanium magnesium couple in the two structural components was different, resulting in different degrees of protection for TC4. The larger the contact area between the two, the higher the degree of protection for TC4.
