Abstract:Deep-sea development holds significant economic and strategic value. However, the extreme conditions of high pressure and high salinity in deep-sea environments often lead to stress corrosion issues in metal equipment. This project aims to elucidate the relationship between mechanical loads and corrosion in two types of aluminum alloy materials used in deep-sea equipment, as well as the specific mechanisms of corrosion. By combining experimental testing with finite element analysis (FEA), we conducted numerical simulation analyses of solid mechanics and electrochemical corrosion coupling for various parts of the equipment model made from different materials. The calculation results indicate that, at a depth of 0.5 km, the maximum corrosion rate on the surface of equipment made from 7049 aluminum alloy is only 0.0163 mm/yr, which is slightly lower than the maximum corrosion rate of 0.0182 mm/yr observed on the surface of equipment made from 6A02 aluminum alloy. This demonstrates that 7049 aluminum alloy is more suitable for service in deep-sea environments.
