中文摘要：

采用开尔文探针技术（SKP）测量AZ91D镁合金与H62铜合金偶接试样在盐雾加速实验中的电偶腐蚀规律．研究表明：AZ91D镁合金的电偶腐蚀效应受到阳极与阴极的电位差的影响，AZ91D镁合金与H62铜合金偶接试样之间的伏打电位差约为-1．22V，AZ91D镁合金存在显著的电偶腐蚀效应．由于存在较大的伏打电位差，在盐雾实验初始阶段，电偶腐蚀主要发生在偶接界面AZ91D镁合金一侧附近区域，而H62黄铜没有发生明显腐蚀．由于AZ91D镁合金在盐雾中生成的腐蚀产物对基体具有一定的保护作用，AZ91D镁合金表面腐蚀产物与基体间存在显著的伏打电位差，导致AZ91D镁合金基体形成新的腐蚀产物．因此，随着盐雾实验时间延长，AZ91D镁合金电偶腐蚀效应降低，H62铜合金腐蚀加快．

英文摘要：

The galvanic corrosion of AZ91D magnesium alloy coupled with H62 brass alloy using accelerated testing in salt fog spraying was investigated by using the scanning Kelvin probe technique （ SKP）. The results show that the galvanic corrosion effect of AZ91D magnesium alloy is influenced by the potential difference between anode and cathode materials. The potential difference be- tween AZ91D magnesium alloy and H62 brass alloy is about - 1.22 V during accelerated testing in the initial stage of salt fog spraying. The galvanic corrosion effect of AZ91D magnesium alloy is very significant. Galvanic corrosion occurs mainly at the interface near to AZ91D magnesium alloy, and H62 brass alloy is of no significant corrosion. As the corrosion products of AZ91D magnesium alloy have a protective effect, the potential difference between the corrosion products and matrix is significant, and then new corrosion products occurs in the matrix of AZ91D magnesium alloy. With prolonging the salt spray test time, the galvanic corrosion effect of AZ91 D magnesium alloy reduces and the corrosion of H62 brass alloy accelerates.