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利用扫描电镜 (SEM)、X射线衍射 (XRD)等分析手段 ,研究了MB8镁合金微弧氧化陶瓷膜层的生长规律 ,分析了微弧氧化条件下氧化镁膜层致密性和相结构与处理时间的关系。结果表明 ,在微弧氧化初期膜层致密 ,几乎观察不到疏松层 ;随着处理时间的延长及膜层的增厚 ,其外侧开始出现疏松层 ,最终可达到膜层总厚度的 90 %左右。膜层相结构主要由MgO、MgSiO3、MgAl2 O4和无定形相组成。随着膜层厚度的增加 ,膜层中MgO、MgAl2 O4的含量不断地增加 ,MgSiO3 的含量基本不变 ,而无定形相的含量却逐渐减少
The growth of MAO coatings on MB8 magnesium alloy was studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. The compactness, phase structure and treatment of magnesium oxide coating under microarc oxidation The relationship of time The results show that the coating layer is dense at the initial stage of MAO, and almost no loose layer is observed. With the extension of treatment time and the thickening of the coating layer, the loose layer begins to appear on the outer side of the MAO layer, and finally reaches about 90% of the total thickness of the coating layer . The phase structure of the film mainly consists of MgO, MgSiO3, MgAl2O4 and amorphous phase. With the increase of film thickness, the contents of MgO and MgAl2O4 in the film continuously increase, while the content of MgSiO3 remains unchanged while the content of amorphous phase decreases