| X70管线钢焊接接头慢拉伸应力腐蚀行为 |
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| 引用本文： | 孔德军,吴永忠,龙丹.X70管线钢焊接接头慢拉伸应力腐蚀行为[J].材料热处理学报,2011,32(9). |
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| 作者姓名： | 孔德军 吴永忠 龙丹 |
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| 作者单位： | 常州大学机械工程学院,江苏常州,213016 |
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| 基金项目： | 江苏省自然科学基金(BK2009104) |
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| 摘 要： | 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。
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| 关 键 词： | X70管线钢 焊接接头 电化学腐蚀 腐蚀产物 |
Stress corrosion behavior of X70 steel pipeline welded joints by slow strain rate testing |
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| KONG De-jun,WU Yong-zhong,LONG Dan.Stress corrosion behavior of X70 steel pipeline welded joints by slow strain rate testing[J].Transactions of Materials and Heat Treatment,2011,32(9). |
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| Authors: | KONG De-jun WU Yong-zhong LONG Dan |
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| Affiliation: | KONG De-jun,WU Yong-zhong,LONG Dan(College of Mechanical Engineering,Changzhou University,Changzhou 213016,China) |
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| Abstract: | Microstructure of X70 pipeline steel welded joints was observed by means of metallurgical microscope,and its stress corrosion behavior in NACE solution was analyzed by slow strain rate testing(SSRT),the self-corrosion potentials of X70 pipeline steel welded joints in NACE solution with different H2S concentrations were measured,and the forming mechanism of self-corrosion potential of X70 pipeline steel welded joints was discussed.The experimental results show that the micro-cracks produced by M-A component ... |
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| Keywords: | X70 pipeline steel welded joint electrochemical corrosion corrosion product |
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