SEM showed that sample surface of passive film was grid, and crack was branch-type, and sediment on passive film was bloom shape.
扫描电镜显示，试样表面的腐蚀产物膜呈网格状，裂纹呈树枝型，腐蚀产物膜上的沉积物呈花朵状；
SEM showed that sample surface of passive film was grid, and crack was branch-type, and sediment on passive film was bloom shape.
扫描电镜显示，试样表面的腐蚀产物膜呈网格状，裂纹呈树枝型，腐蚀产物膜上的沉积物呈花朵状；
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