1.中国船舶重工集团有限公司第七一〇研究所;2.中国海洋大学 材料科学与工程学院
1.710 Research Institute, China Shipbuilding Industry Corporation;2.School of Materials Science and Engineering, Ocean University of China
深海开发具有极高的经济战略意义,而深海高压、高盐度的极端环境中极易引起金属设备的应力腐蚀问题。本项目以揭示两种铝合金材料设备在深海环境中的力学载荷与腐蚀之间的关系以及具体的腐蚀机理为目标,使用实验测试配合有限元计算的方法对设备模型中不同材质的各个部位分别进行了固体力学及电化学腐蚀耦合的数值模拟仿真分析。计算结果表明在0.5 km深度海域中,7049铝合金材质设备表面最大腐蚀速率仅为0.013 mm/yr,这一数值略低于6A02铝合金材质设备表面0.016 mm/yr的最大腐蚀速率,证明7049铝合金材料更适应深海服役环境。
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.
