研制了一种新型镁合金的无Cr阳极氧化配方，对镁合金进行 阳极化处理.溶液的主要成分为NaOH、NaSiF6和有机添加剂.XRD、SEM、XPS测试结果表明 ，氧化膜主要由MgO、MgAl2O4和2Al2O3·2SiO2·H2O组成.35%NaCl水溶 液动电位极化结果说明，氧化膜有良好耐点蚀性能.合金中Si、Al元素的氧化弥补了Mg氧化 时的体积收缩，氧化膜无裂纹，为其耐点蚀提供了条件.阳极化后Al、Si元素在表面均匀分 布，是氧化膜具有良好保护作用的原因之一.
A suitable mixture without chromium is developed for protection of mag nesium alloys by treatment with the anodic oxidation.The aqueous solution is co mposed of NaOH、Na2SiF6 and an organic additive.The potentiodynamic polariza tio n measurement showed that the film had outstanding protective ability in 3.5% Na Cl solution.The morphology and component of the anodic oxidation film have been analysed by SEM,XRD,XPS and EPMA respectively.XRD and EPMA analysis revealed that the film was made of MgO、MgAl2O4 and 2Al2O3·2SiO2·H2O.Si and Al oxides make up the volume shrinkage of magnesium oxides,so that the film has no crack which provides a good condition against pitting.And the even dispersio ns of Si and Al in the film is another factor that the film has better protectio n.
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