Unique corrosion reinforcement mechanism of pipeline oil sludge with sulfate-reducing bacteria on X60 steel and the targeted long-term inhibition of DMTT delivery
作者
单位
1Key Laboratory of Material Chemistry for Energy Conversion and Storage、Ministry of Education、Hubei Key Laboratory of Material Chemistry and Service Failure、Hubei Engineering Research Center for Biomaterials and Medical Protective Materials、School of Chemistry and Chemical Engineering、Huazhong University of Science and Technology、Wuhan 430074、P. R. China
关键词
收录来源
International Corrosion Congress · 第22届国际腐蚀大会
摘要
This work investigated the microbial corrosion behavior of X60 pipeline steel under pipeline oil sludge enriched with field -separated SRB and compared the corrosion inhibitory effects of biocides CTAC and DMTT on X60 steel SRB -MIC in different mediums. Oil sludge possessed corrosive property. The oil sludge medium prevented the escape of H2S from SRB metabolism, which caused acidification of the oil sludge. The number of planktonic and sessile cells in the solution medium increased and then decreased, while the cell counts in the oil sludge medium continued to increase. The corrosion rate of carbon steel in SRB oil sludge was 1.6 times higher than that in SRB solution. The corrosion of the X60 coupons in SRB mediums was mainly localized, with corrosion pits up to 252.6 μm wide and 34.05 μm deep in the SRB oil sludge system. The excellent water-soluble CTAC effectively inhibited the SRB-MIC in solution but had little effect on the SRB-MIC in the oil sludge. The MIC in solution and in oil sludge was inhibited for a long period of time by 100 ppm DMTT. Application of DMTT in pipelines covered by oil sludge may be a new method for long-lasting inhibition of SRB-MIC.