孔德军,吴永忠,龙丹

• 1:常州大学机械工程学院

摘要(Abstract)：

利用金相显微镜观察了X70管线钢焊接接头组织结构,通过慢拉伸试验分析了X70管线钢焊接接头在NACE溶液中应力腐蚀行为,测试了X70管线钢焊接接头在不同H2S浓度下电化学腐蚀电位,讨论了X70管线钢焊接接头自腐蚀电位形成机理。结果表明,X70管线钢焊接接头熔合区中M-A组元所产生的微裂纹是焊接接头应力腐蚀产生裂纹的主要来源,使得其耐腐蚀性能下降;焊接接头在腐蚀初期主要表现为典型的点腐蚀特征,点蚀坑相互连接不断扩展,点蚀坑被生成的腐蚀产物所覆盖;焊接接头自腐蚀电位随着H2S浓度的增加而发生负移,应力腐蚀敏感性增加,在含饱和H2S NACE溶液中具有明显的应力腐蚀倾向。

关键词(KeyWords)： X70管线钢;焊接接头;电化学腐蚀;腐蚀产物

Abstract:

Keywords:

基金项目(Foundation): 江苏省自然科学基金(BK2009104)

作者(Author): 孔德军,吴永忠,龙丹

DOI: 10.13289/j.issn.1009-6264.2011.09.016

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