通过电化学阻抗(EIS)和动电位极化曲线等方法研究了镁合金在乳酸和含有Cl-的溶液中的电化学特性,发现镁合金腐蚀过程受到电极电位E、以β相为中心向外扩展的表面氧化膜的覆盖面积θ和MgH2的浓度Cm3个表面状态变量的控制。在腐蚀过程中，β相表面氧化膜向四周扩展，覆盖了邻近很小范围的α相晶粒，从而使部分α相晶粒不受腐蚀，最后通过理论推导建立了一个新的镁合金腐蚀理论模型，并利用EIS实验证实了模型的可靠性。
Corrosion behavior of AZ91D alloy in lactic acid solutions with and without Cl- were discussed by EIS and polarization curves. The corrosion process of magnesium alloy in acidic solutions was controlled by three surface state variables: electrode potential(E), area of surface film of β phase (θ), and concentration of intermediate MgH2(Cm). During the corrosion process, a narrow periphery of αphase just around βphase was covered by the surface film extended from the film grown on β phase. Through this way, the α phase was partially protected. A new model was presented to describe the corrosion process of the magnesium alloy.
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