X80钢在干湿交替阴极电位下的应力腐蚀行为  

Stress Corrosion Behavior of X80 Steel Under Alternating Wet and Dry Cathodic Potential

作　　者：刘馨忆 吴明 唐亮[3] 王旭 孙东旭[2] 杜金[4] 荆思文 LIU Xinyi;WU Ming;TANG Liang;WANG Xu;SUN Dongxu;DU Jin;JING Siwen(College of Pipeline and Civil Engineering,China University of Petroleum,Qingdao 266000,China;College of Petroleum Engineering,Liaoning Petrochemical University,Fushun 113000,China;Dalian Changzhi Lin Technology Co.,Ltd.,Dalian 116000,China;China Petroleum Pipeline Research Institute Co.,Ltd.,Langfang 065000,China;Shandong Yankuang Intelligent Manufacturing Co.,Ltd.,Jining 273500,China)

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,山东青岛266000 [2]辽宁石油化工大学石油与天然气工程学院,辽宁抚顺113000 [3]大连长之琳科技股份有限公司,辽宁大连116000 [4]中国石油天然气管道科学研究院有限公司,河北廊坊065000 [5]山东兖矿智能制造有限公司,山东济宁273500

出　　处：《有色金属工程》2024年第4期58-66,共9页Nonferrous Metals Engineering

基　　金：国家自然科学基金面上项目(52274062)。

摘　　要：通过电化学和慢应变速率拉伸试验,研究了X80钢在干湿交替海洋环境中不同阴极电位下的应力腐蚀开裂(SCC)机理。结果表明:-850 mV电位降低了钢的腐蚀电流密度,电流密度随外加电位的减小而增大,由于应变的作用,阴极保护效果逐渐降低。与不加电位相比,钢在-850 mV电位下的SCC敏感性降低了14.28%,而在-1200 mV电位下的敏感性提高了71.42%,从韧性断裂转变为脆性断裂。外加电位的保护作用是通过抑制钢的阳极溶解来实现的,随着电位的降低,引发剧烈的析氢反应,导致SCC敏感性升高。Stress corrosion cracking(SCC)mechanism of X80 steel under different cathodic potentials in alternating wet and dry marine environment is investigated by electrochemical test and slow strain rate tensile test.The results show that the cathodic potential of-850 mV reduces the corrosion current density of steel,and the corrosion current density increases with the decrease of applied potential.The effect of cathodic protection gradually decreases due to strain.Compared with no applied potential,the SCCsusceptibility of steel at-850 mV potential is reduced by 14.28%,while the susceptibility at-1200 mV potential is increased by 71.42%,the specimens change from ductile fracture to brittle fracture.The protection effect of the applied potential is achieved by inhibiting the anodic dissolution of the steel.With the decrease of the potential,severe hydrogen evolution reaction is triggered,resulting in higher SCCsusceptibility.

关 键 词：应力腐蚀 X80钢 阴极电位 干湿交替 

分 类 号：TE973[石油与天然气工程—石油机械设备] TE988