2205 DSS在硫酸盐还原菌及铁细菌微生物环境下的腐蚀行为  

Corrosion Behavior of 2205 DSS in Sulfate Reducing Bacteria and Ferro Bacteria Microbial Environment

作　　者：林建荣[1] 汤棠 程文钦 罗勇[3] 董应兴 吕卓伦 LIN Jianrong;TANG Tang;CHENG Wenqin;LUO Yong;DONG Yingxing;LYU Zhuolun(Sichuan Kehong Petroleum Engineering Co.,Ltd.,Chongqing 400021,China;School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;PetroChina Chuanqing Drilling Engineering Co.,Ltd.,Chengdu 610051,China;Shunan Gas Mine,PetroChina Southwest Oil&Gas Field Company,Luzhou 646000,China)

机构地区：[1]四川科宏石油天然气工程有限公司,重庆400021 [2]西南石油大学新能源与材料学院,四川成都610500 [3]中石油川庆钻探工程有限公司,四川成都610051 [4]中石油西南油气田公司蜀南气矿,四川泸州646000

出　　处：《材料保护》2024年第5期90-96,136,共8页Materials Protection

基　　金：南充市市校合作项目(SWJBGS004)。

摘　　要：针对页岩气田集输管道的细菌腐蚀问题,以2205 DSS为对象,采用SEM、EDS、AFM及电化学分析等方法,对比实验研究了其在无菌及有菌模拟介质[含2.5×10^(4)个/mL硫酸盐还原菌(SRB)和6.0×10^(3)个/mL铁细菌(FB)]中的腐蚀行为。结果表明:2种环境下2205 DSS均出现点蚀,但有菌模拟水中试样的点蚀情况更为严重;有菌模拟介质腐蚀试样表面存在许多分散的含Fe、O、S等元素附着物;通过阻抗分析,试样表面钝化膜在微生物影响下发生硫化,导致极化电阻有所下降;极化曲线分析表明,在微生物的影响下试样的腐蚀电位降低,说明其耐蚀性有所下降。通过实验结果分析,2205 DSS在页岩气输送环境下的腐蚀机理为:前期有氧气残留时,主要是FB的活动为主,会产生富含铁的厌氧环境,之后SRB在Cl^(-)作用下在厌氧区繁殖产生硫化物沉淀,加剧了不锈钢的腐蚀。Aiming at the problem of bacterial corrosion in the gathering and transportation pipeline of shale gas field,the corrosion behavior of 2205 DSS in sterile and bacteria-bearing simulated media[Containing 2.5×10^(4)/mL sulfate reducing bacteria(SRB)and 6.0×10^(3)/mL ferro bacteria(FB)]was compared and studied by means of SEM,EDS,AFM and electrochemical analysis.Results showed that the pitting of 2205 DSS occurred in both environments,but the pitting of the sample in simulated water with bacteria was more serious.There were many dispersed attachments of elements such as Fe,O and S on the surface of samples corroded by simulated media with bacteria.Impedance analysis showed that the passivated film on the surface of the sample was vulcanized under the influence of microorganisms,resulting in a decrease in polariza-tion resistance.Moreover,the polarization curve analysis showed that the corrosion potential of the sample decreased under the influence of mi-croorganisms,indicating that its corrosion resistance decreased.Through the analysis of experimental results,the corrosion mechanism of 2205 DSS in the shale gas transmission environment was:when there was residual oxygen in the early stage,it was mainly the activity of FB that pro-duced an anaerobic environment rich in iron;later,SRB proliferated in the anaerobic zone under the action of Cl^(-),producing sulfide precipita-tion,which intensified the corrosion of stainless steel.

关 键 词：页岩气集输管道 2205 DSS 细菌腐蚀 SRB FB 

分 类 号：TG172[金属学及工艺—金属表面处理]