Beneath the corrosion products,inner surface of the elbows existed micro cracks from inside to outside inter-granularly,which displayed the characteristic of hydrogen corrosion.
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美
- 三相微粒流造成已形成的腐蚀膜剥离,并使因氢蚀后形成晶界裂纹失去联系的晶粒与金属分离;