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金属学报  2013 

阴极极化对X80管线钢在模拟深海条件下氢脆敏感性的影响

DOI: 10.3724/SP.J.1037.2013.00271, PP. 1089-1097

Keywords: X80管线钢,深海环境,阴极保护,氢脆敏感性,慢应变速率拉伸,渗氢电流

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Abstract:

采用电化学测试、氢渗透电流检测、慢应变速率拉伸实验和断口分析等方法研究了X80管线钢在模拟深海条件下的氢脆敏感性,并对阴极极化电位的影响进行了考察.结果表明,阴极极化电位对材料的氢渗透和氢致开裂行为影响明显.渗氢电流与阴极极化电位呈现良好的线性关系,X80管线钢在自腐蚀状态下没有氢脆敏感性,在－900mV以上的阴极电位范围内,渗氢电流密度不超过0.1157μA/cm2,且力学性能也无明显下降,是较适合的阴极保护电位区间,而负于该电位时,渗氢电流增大,慢应变速率拉伸试样断口由韧窝形貌转变为准解理形貌,材料脆断现象明显.

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