缝隙宽度和外加阴极保护电位对NS4溶液中X80管线钢应力腐蚀敏感性的影响  

Effects of Gap Width and Cathodic Potential on Stress Corrosion Cracking Susceptibility of X80 Pipeline Steel in NS4 Solution

作　　者：胡浩 王英波 殷振兴 唐晓 DENG Ruifeng HU Hao;WANG Yinbo;YIN Zhenxing;DENG Ruifeng;TANG Xiao(Rizhao Shihua Crude Oil Terminal Co.,Ltd.,Rizhao 276800,China;College of Chemical Engineering,University of China Petroleum(East China),Qingdao 266580,China)

机构地区：[1]日照实华原油码头有限公司,日照276800 [2]中国石油大学(华东)材料科学与工程学院,青岛266580

出　　处：《腐蚀与防护》2021年第9期39-43,共5页Corrosion & Protection

基　　金：国家自然科学基金(51971246,51979282);工信部海洋工程装备项目(工信部联装[2014]499号)。

摘　　要：采用慢应变速率试验(SSRT)研究了缝隙宽度和阴极保护电位对模拟剥离涂层下NS4溶液中X80管线钢的应力腐蚀敏感性的影响。结果表明:随着缝隙宽度的增加,X80管线钢的应力腐蚀敏感性呈先增大后减小的趋势,其在100μm缝隙宽度条件下的应力腐蚀敏感性最高;缝隙宽度为200μm时,随阴极保护电位的负移,X80管线钢的应力腐蚀敏感性呈先降低后升高的趋势;阴极保护电位为-1100 mV时,X80管线钢的应力腐蚀敏感性较高是阴极析氢和应力的共同作用导致的。Slow strain rate test(SSRT) was used to study the effects of gap width and cathodic protection potential on stress corrosion cracking susceptibility of X80 pipeline steel in NS4 solution under simulated peeling coating. The results showed that with the increase of the gap width, the stress corrosion cracking susceptibility of X80 pipeline steel first increased and then decreased, and the highest stress corrosion cracking susceptibility was under the condition of 100 μm gap width. When the gap width was 200 μm, the stress corrosion sensitivity of X80 pipeline steel showed a trend of first decreasing and then increasing with the negative shift of the applied cathodic protection potential. When the cathodic protection potential was-1 100 mV, the high stress corrosion sensitivity was due to the combined effect of cathodic hydrogen evolution and stress.

关 键 词：X80管线钢 剥离涂层 NS4溶液 应力腐蚀敏感性 

分 类 号：TG174[金属学及工艺—金属表面处理]