温度对管线钢在SRB/CO_(2)环境中的腐蚀影响  

Effect of Temperature on Corrosion of Pipeline Steel in SRB/CO_(2) Environment

作　　者：裴文霞 赵国仙[1] 丁浪勇 方堃 王帆[1] 刘冉冉 PEI Wenxia;ZHAO Guoxian;DING Langyong;FANG Kun;WANG Fan;LIU Ranran(School of Materials Science and Engineering,Xi’an Shiyou University,Xi’an 710000,China)

机构地区：[1]西安石油大学材料科学与工程学院,西安710000

出　　处：《材料导报》2024年第23期170-177,共8页Materials Reports

摘　　要：通过研究在硫酸盐还原菌(SRB)/饱和CO_(2)环境中X65管线钢的腐蚀特征,探究温度对其腐蚀性能的影响。在20℃、40℃、60℃三种温度下对X65管线钢进行浸泡试验和电化学测试,通过16S rRNA基因测序分析高温下溶液中SRB的变化,并观察腐蚀后的表面形貌和点蚀坑特征。结果表明:随着温度升高,SRB代谢加快,高温下嗜热的SRB优先选择生长繁殖并且协同其他产生S^(2-)的嗜热菌加速了S^(2-)的生成,促进S从氧化态向还原态转变,并沉积在腐蚀产物中。40℃时,SRB数量最多,点蚀速率最大,这与SRB在试样表面的吸附有关。在SRB群落吸附区域,试样表面的还原作用增强,局部阴极反应加速,蚀孔产生。60℃时,均匀腐蚀速率最大,此时离子传质加快、嗜热SRB菌属大量繁殖,微生物与CO_(2)共同作用造成严重的均匀腐蚀。The present work explored the effect of temperature on its corrosion performance,and investigated the corrosion characteristics of X65 pipeline steel in sulfate reducing bacteria(SRB)/saturated CO_(2) environment.Immersion and electrochemical tests were conducted on X65 pipeline steel at three temperature levels of 20℃,40℃,and 60℃.The changes in SRB in the solution at high temperature were detected through 16S rRNA gene sequencing,and the surface morphology and pitting characteristics after corrosion were observed.The results showed that as temperature of the solution increased,SRB metabolism accelerated.Thermophilic SRB preferentially proliferated at high temperatures,and together with other thermophilic bacteria that produce S^(2-),it accelerated the generation of S^(2-),promoting the transition of S from an oxidizing state to a reducing state,and depositing it in corrosion products.At 40℃,the number of SRBs was the highest and the pitting rate was the highest,which could be attributed to the adsorption of SRBs on the surface of the sample.In the adsorption area of the SRB community,the reduction effect on the sample surface was enhanced,local cathodic reactions were accelerated too,and corrosion pores were generated.At 60℃,the uniform corrosion rate was the highest,the ion mass transfer was accelerated,and the thermophilic SRB genus largely proliferated.The combined action of microorganisms and CO_(2) caused severe uniform corrosion.

关 键 词：微生物腐蚀 硫酸盐还原菌 生物膜 温度 点蚀 

分 类 号：TG172.4[金属学及工艺—金属表面处理]