宋博强,陈旭,马贵阳,刘睿

• 1:辽宁石油化工大学石油天然气工程学院

摘要(Abstract)：

采用动电位极化技术、慢应变速率拉伸试验和扫描电镜观察研究了有、无硫酸盐还原菌(SRB)情况下X70管线钢及焊缝在近中性p H溶液(NS4)中的应力腐蚀行为。电化学实验结果表明:X70管线钢母材和焊缝在NS4溶液中的极化曲线都表现出典型的活性溶解特征,且有菌介质中管线钢表面能生成一层具有保护性的生物膜。SSRT曲线和SEM结果表明:在无菌NS4溶液中,X70钢母材和焊缝的SCC机理为氢致开裂机理。在有SRB的NS4溶液中,由于SRB生命代谢释放大量代谢产物H2S,促进H原子进入管线钢,将破坏其基体的连续性,从而导致氢损伤,使X70钢母材和焊缝的SCC敏感性都大于其在无菌介质中,其开裂机理表现为硫化物应力开裂和氢致开裂共同作用。在有菌和无菌介质中,焊缝的应力腐蚀敏感性均高于母材,这是由于焊缝处组织不均匀、存在残余应力造成的。

关键词(KeyWords)： X70管线钢;焊缝;硫酸盐还原菌;慢应变速率拉伸;近中性pH溶液;应力腐蚀开裂

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51201009);; 辽宁省自然科学基金(2013020078)

作者(Author): 宋博强,陈旭,马贵阳,刘睿

DOI: 10.13289/j.issn.1009-6264.2016.04.022

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