外加阴极电位对X100管线钢近中性pH值应力腐蚀开裂行为的影响  

Effects of Applied Cathode Potential on the Behavior of Near-neutral pH SCC of X100 Pipeline Steel

作　　者：郏义征[1,2] 李辉[1] 胡楠楠[3] 王清远[2] 

机构地区：[1]四川建筑职业技术学院博士后创新实践基地,四川德阳618000 [2]四川大学建筑与环境学院,四川成都610065 [3]四川建筑职业技术学院材料工程系,四川德阳618000

出　　处：《四川大学学报（工程科学版）》2013年第4期186-191,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(11172188)

摘　　要：采用慢应变速率拉伸实验研究了X100管线钢在NS4溶液中,在外加阴极电位下的应力腐蚀开裂行为。结果表明,与在自腐蚀电位下相比,-900mVSCE外加阴极电位没有明显增强其近中性pH应力腐蚀开裂(NNpH-SCC)敏感性;但是,当外加阴极电位为-1500mVSCE时,其NNpH-SCC敏感性显著增强。与X80管线钢在外加阴极电位下的NNpH-SCC敏感性相比较后表明,外加阴极电位对X80管线钢的NNpH-SCC敏感性影响更加强烈。Slow strain rate tests were conducted in deaerated NS4 solution to research the behavior of stress corrosion cracking of X100 pipeline steels at different applied cathode potential.The results showed that the susceptibility of near-neutral pH stress corrosion cracking（NNpH-SCC） does not increase obviously at-900 mV SCE than that at open circuit potential.However,the NNpH-SCC susceptibility increases distinctly at-1 500 mV SCE than that at open circuit potential.The NNpH-SCC susceptibility at applied cathode potential were contrasted between X100 and X80 pipeline steel,which revealed that the NNpH-SCC susceptibility influenced by applied cathode potential of X80 pipeline steel is stronger than that of X100 pipeline steel.

关 键 词：X100管线钢 外加阴极电位 NNpH-SCC敏感性 慢拉伸实验 

分 类 号：TG142.1[一般工业技术—材料科学与工程]