膜层由内部致密层和外部疏松层组成。
It is composed of inner compact layer and Outer loose layer.
SEM显示，紧密层和疏松层中均存在大量的龟裂纹。
Many cracks were observed in both layers under higher magnification SEM study.
并且微弧氧化先期形成的主要是致密层，疏松层则主要是在后期形成。
The film formed in the early stage is more compact than in the later stage.
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