硫酸盐还原菌对CaCO_(3)垢层下20号钢腐蚀的影响  

Effect of Sulfate-Reducing Bacteria on Corrosion of 20# Steel under CaCO_(3) Scale

作　　者：李东博 董美[1] 杜胜男[1] 闫茂成[2] 王卫强[1] Li Dongbo;Dong Mei;Du Shengnan;Yan Maocheng;Wang Weiqiang(College of Petroleum Engineering,Liaoning Petrochemical University,Fushun Liaoning 113001,China;State Key Laboratory for Corrosion and Protection,Metal Research Chinese Academy of Sciences,Shenyang Liaoning 110016,China)

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001 [2]中国科学院金属研究所国家金属腐蚀控制工程技术研究中心,辽宁沈阳110016

出　　处：《辽宁石油化工大学学报》2022年第4期17-24,共8页Journal of Liaoning Petrochemical University

基　　金：辽宁省教育厅项目(L20190008、L2020027)。

摘　　要：采用室内模拟实验的方法,研究了硫酸盐还原菌(SRB)和CaCO_(3)垢层共存对20号钢腐蚀行为的影响。通过腐蚀失重法研究平均腐蚀速率,通过电化学阻抗谱(EIS)和开路电位(OCP)研究注入水溶液中20号钢腐蚀电化学行为,利用扫描电镜(SEM)、EDS和Raman光谱分析20号钢表面腐蚀产物的形貌和成分,采用激光共聚焦显微镜(CLSM)分析20号钢的点蚀坑深度。结果表明,SRB与CaCO_(3)垢层存在协同作用,CaCO_(3)垢层的孔隙率和垢层下的厌氧环境为SRB的黏附和生长提供了便利的条件,接种SRB对CaCO_(3)垢层下20号钢的均匀腐蚀和局部腐蚀均有促进作用。The influence of sulfate reducing bacteria(SRB)and CaCO_(3) scale layer on the corrosion behavior of 20^(#) steel was studied by laboratory simulation experiment.The uniform corrosion rate was studied by corrosion weight loss method.The corrosion electrochemical behavior of 20^(#) steel in the injected aqueous solution was studied by electrochemical impedance spectroscopy(EIS)and open circuit potential(OCP).The morphology and composition of corrosion products on the surface of 20^(#) steel were analyzed by scanning electron microscopy(SEM),EDS and Raman spectroscopy.The pitting pit depth of 20#steel was analyzed by laser confocal microscopy(CLSM).The results show that there is a synergistic effect between SRB and CaCO_(3) scale layer.The porosity of CaCO_(3) scale layer and the anaerobic environment under the scale layer provide convenient conditions for the adhesion and growth of SRB.The inoculation of SRB can promote the uniform corrosion and local corrosion of 20^(#) steel under the CaCO_(3) scale layer.

关 键 词：腐蚀 硫酸盐还原菌(SRB) CaCO_(3)垢层 20号钢 注水系统 

分 类 号：TE98[石油与天然气工程—石油机械设备] TG174[金属学及工艺—金属表面处理]