因钢锭模表面生成气体而形成的表面针孔。
采用SEM对试样表面生成氧化膜的形貌进行了观察比较。
The morphology of oxide membrane on each sample surface was observed by SEM.
在SEM下观察发现， 钝化处理后镁粒表面生成了致密的钝化层，且包裹均匀。
It is founded under SEM that the passivated coating of magnesium powder is compact and even.
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