针对镁合金汽车轮毂在实际应用中出现的电偶腐蚀这一难题，建立了轮毂、螺栓连接电偶腐蚀的物理模型和数学模型，推导出电偶腐蚀分析的控制方程式，利用有限元方法结合移动网格技术，模拟研究了镁合金轮毂-钢质螺栓连接在NaCI溶液中的电偶腐蚀行为，得到了连接螺栓沉孔深度和沉孔半径对轮毂腐蚀深度的影响规律；并通过轮毂-螺栓连接偶对金属的全浸试验，验证了镁合金轮毂-钢质螺栓连接电偶腐蚀模拟分析方法的正确性。结果表明：随着沉孔深度增加，平均腐蚀深度先增加后减小；随着沉孔半径增加，平均腐蚀深度逐渐减小，而连接边缘处最大腐蚀深度先增加后近似保持不变。

Aiming at the problem of galvanic corrosion of magnesium alloy hub in automotive industry, the physical model and mathematical model of galvanic corrosion for hub-bolt joint were built and the governing equations of galvanic corrosion were deduced. In combination with a moving mesh technique, the galvanic corrosion behavior of magnesium alloy hub-steel bolt joints in a sodium chloride solution was investigated by finite element method. And the influence law of counterbore depth and counterbore radius on the corrosion depth of hub was obtained. The correctness of the simulation method for the galvanic corrosion of magnesium alloy hub-steel bolt joint was verified by the full immersion test of the hub-bolt coupling pair. The results showed that with the increase of sinkhole depth, the average depth of corrosion increased first and then decreased. With the increase of sinkhole radius, the average depth of corrosion decreased, while the maximum depth of corrosion increased first and then remained approximately unchanged.