孙齐磊,曹备,吴荫顺

• 1:北京科技大学材料学院腐蚀与防护中心

摘要(Abstract)：

采用慢应变速率试验(SSRT)、扫描电镜以及电化学测量技术研究了X70管线钢焊接接头在近中性模拟土壤溶液中的应力腐蚀开裂(SCC)行为。结果表明,断口和柱面SCC裂纹均发生在热影响区(HAZ)。在试验溶液中,随着外加极化电位降低管线钢SCC敏感性增强,电位负移到一定电位值后,SCC敏感性减弱;随着溶液pH值降低,腐蚀速率增大,敏感电位区间负移。施加阴极电位时,在试样断口观察到明显的准解理脆断特征,断口和柱面有穿晶SCC裂纹。分析了焊接接头试样HAZ的SCC机理,在试验介质中,管线钢应力腐蚀开裂主要受阳极溶解和氢致开裂两种机理的联合作用,适当的电位可以使阳极溶解和氢致开裂的联合作用达到最大,从而造成较严重的应力腐蚀开裂。

关键词(KeyWords)： X70管线钢;焊接接头;应力腐蚀;阳极溶解;氢致开裂

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作者(Author): 孙齐磊,曹备,吴荫顺

参考文献(References)：

• [1]Delanty B,O’Brien J.Major field study compares pipeline stress corrosion cracking with coatings[J].Oil Gas,1992,90(24):39.
• [2]Parkins R N,Alexandridou A,Majumdar P.Stress corrosion cracking of C-Mn steels in environments coating carbon dioxide[J].MP,1986,25(10):10.
• [3]Gonzalez-Rodriguez J G,Casales M,Salinas-Bravo V M,et al.Effect of microstructure on the stress corrosion cracking of X-80 pipeline steel in dilutedsodiumbicarbonate solutions[J].Corrosion,2002,58(7):584-590.
• [4]Rebak R B,Xia Z,Safruddin R,et al.Effect of solution composition and electrochemical potential on stress corrosion cracking of X52 pipeline steel[J].Corrosion,1996,52(5):396-405.
• [5]Zhang X Y,Lambert S B,Sutherby R,et al.Transgranular stress corrosion cracking of X-60 pipeline steel insimulated ground water[J].Corrosion,1999,55(3):297-305.
• [6]Chen W,King F,Vokes E.Characteristics of near-neutral-pHstress corrosion cracks in an X-65 pipeline[J].Corrosion,2002,58(3):267-275.
• [7]Charles E A,Parkins R N.Generation of stress corrosion cracking environments at pipeline surface[J].Corrosion,1995,51(7):518-527.
• [8]查全性,等.电极过程动力学导论[M].北京:科学出版社,2004.
• [9]刘杏,杨武.天然气长输管线应力腐蚀破裂的敏感环境条件[J].机械工程材料,2002,26(1):5-12.LIUXing,YANG Wu.The susceptible environmental conditions of stress corrosion cracking of gas pipelines[J].Materials for Mechanical Engineering,2002,26(1):5-12.

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