The check and the analysis of the pattern of corrosion pit indicated that it was pit corrosion.

对支撑梁蚀坑形貌的检查和分析表明该腐蚀为小孔腐蚀。

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The result show that the size of equivalent initial surface crack is less than 19.7to 22.5 percent of surface corrosion pit size which have the same life.

结果发现，把腐蚀坑等效为具有相同寿命的表面裂纹时，等效表面裂纹的尺寸比对应腐蚀的尺寸小19.7% - 22.5%。

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The result show that the size of equivalent initial surface crack is less than 19.7to 22.5 percent of surface corrosion pit size which have the same life.

结果发现，把腐蚀坑等效为具有相同寿命的表面裂纹时，等效表面裂纹的尺寸比对应腐蚀的尺寸小19.7% - 22.5%。

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