ISSN1006－7167CN31－1707/TＲESEAＲCHANDEXPLOＲATIONINLABOＲATOＲY第42卷第1期Vol．42No．12023年1月Jan．2023DOI:10．19927/j．cnki．syyt．2023．01．009天然气管线钢X80在pH4.5H2S/CO2共存环境的腐蚀失效机理李玉坤，黄小光，周龙池，彭启凤(中国石油大学(华东)储运与建筑工程学院，山东青岛266580)摘要:针对天然气管道的内腐蚀问题，利用高温高压反应釜模拟了低pH值及H2S/CO2共存环境，结合SEM、EDS以及XＲD技术探讨了H2S分压、实验温度以及外加应力对X80管线钢的腐蚀速率与腐蚀机理的影响。结果表明，纯CO2腐蚀远较H2S/CO2共存时严重;含H2S条件下，腐蚀产物膜中非晶态Cr(OH)3能提升FeS膜的稳定性，起到表面保护和降低腐蚀速率作用。H2S/CO2共存时，X80管材发生H2S腐蚀反应为主的均匀腐蚀，腐蚀速率随H2S分压增大而升高;腐蚀速率随着环境温度的增加先增后减，在设定的实验条件下，最高的腐蚀速率发生在100℃附近;外加应力对腐蚀速率影响显著，腐蚀速率随应力增加快速升高。关键词:天然气管线;X80钢;腐蚀速率;温度;应力中图分类号:TG172.3文献标志码:A文章编号:1006－7167(2023)01－0043－06CorrosionFailureMechanismofNaturalGasPipelineSteelX80inapH4.5H2S/CO2CoexistenceEnvironmentLIYukun，HUANGXiaoguang，ZHOULongchi，PENGQifeng(CollegeofPipelineandCivilEngineering，ChinaUniversityofPetroleum，Qingdao266580，Shandong，China)Abstract:Internalcorrosionofpipelineisanimportantfactoraffectingthesafetyofnaturalgastransmission．Ahightemperature-pressurereactorisusedtosimulatethelowpHH2S/CO2coexistenceenvironment，andtheeffectsofH2Spartialpressure，experimentaltemperatureandappliedstressonthecorrosionrateandcorrosionmechanismofAPIX80steelarediscussed，combinedwithSEM，EDSandXＲDtechniques．TheresultsshowthatthecorrosionofthesamplesunderpureCO2conditionismuchseriousthanthatunderH2S/CO2coexistence．ThecorrosionstabilityofamorphousfilmunderH2S-containingenvironmentcanbeimprovedtobytheformationofamorphousCr(OH)3，thereforethesurfaceprotectionismoreobviousthanthatinpureCO2condition．TheX80steelissubjecttouniformcorrosiondominatedbyH2Scorrosion，andthecorrosionrateincreaseswiththeincreaseofH2Spartialpressure．Thecorrosionratefirstlyincreasesandthendecrease...
