对AZ91D镁合金进行载波钝化，利用正交试验确定载波钝化工艺的最佳工艺参数。使用扫描电子显微镜（SEM）观察载波钝化后的AZ91D镁合金表面形貌；采用极化曲线、电化学阻抗谱（EIS）、扫描电化学显微镜（SECM）、Mott-Schottky曲线等电化学方法研究了载波钝化对合金耐蚀性能的影响。结果表明：载波钝化后，AZ91D镁合金表面生成了一层非常致密的膜，其耐蚀性能显著提高。
The AZ91D magnesium alloy was treated by modulated passivation technique. The optimal parameter of modulated passivation for the AZ91D magnesium alloy was determined by the orthogonal experiments. The surface morphology was observed by scanning electron microscopy (SEM). An investigation on the corrosion resistance of the magnesium alloy was discussed through potentiodynamic polarization curve, electrochemical impedance spectroscopy, Mott-Schottky curve and scanning electrochemical microscopy (SECM) measurements. The experiment results suggested that a stable film was formed after modulated passivation. The corrosion resistance of the AZ91D magnesium alloy was improved greatly after modulated passivation.
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