The effects of sulphate-reducing bacteria （SRB） on the 2205 duplex stainless steel in the sea water and oil industry environments were studied by electrochemical impedance spectroscopy （EIS）, potentiodynamic polar...The effects of sulphate-reducing bacteria （SRB） on the 2205 duplex stainless steel in the sea water and oil industry environments were studied by electrochemical impedance spectroscopy （EIS）, potentiodynamic polarization and microorganism analysis. The results showed that the detected SRB was the non-spore bacillus of about 0.8μm×（1.8--2.2）μm in size and the content of S was about 7. 59% in the corrosion products. SRB contributed to the corrosion evolution which caused the corrosion failure of 2205 duplex stainless steel pipe in the liquid hydrocarbon cooler. During the corrosion process, the produced H2S could significantly influence the anodic process and finally accelerate the corrosion. SEM observation indicated that the distribution of SRB on the surface of 2205 duplex stainless steel was nonuniform. X ray photoelectron spectroscopy analysis revealed that the surface film was composed of Cr2O3, MoO3 , FeS, FeS2, Fe（OH）2 and FeO after immersing the sample in the SRB medium for 14 d.展开更多
为改善采油污水的可生化性,采用硫酸盐还原菌对三次采油污水中的聚丙烯酰胺(PAM)进行降解实验,探讨污水pH、温度、PAM初始质量浓度、接种量及降解时间对硫酸盐还原菌降解PAM性能的影响。在温度37℃、p H 8、接种量12 mL、PAM初始质量浓...为改善采油污水的可生化性,采用硫酸盐还原菌对三次采油污水中的聚丙烯酰胺(PAM)进行降解实验,探讨污水pH、温度、PAM初始质量浓度、接种量及降解时间对硫酸盐还原菌降解PAM性能的影响。在温度37℃、p H 8、接种量12 mL、PAM初始质量浓度200 mg/L的实验条件下,采用硫酸盐还原菌降解三次采油污水5 d,污水中PAM转化率和CODcr去除率分别为45%和18%,BOD5与CODcr的质量浓度比值从0.15提高至0.25,污水的可生化性明显提升。结果表明,硫酸盐还原菌能够降解三次采油污水中的聚合物PAM。该研究为硫酸还原菌在采油污水处理中的实际应用提供了借鉴。展开更多
In this work, surface characterization and electrochemical measurement were employed to investigate the effects of magnetic field（MF） on the corrosion of Q235 carbon steel in a NaCl solution containing sulphate-redu...In this work, surface characterization and electrochemical measurement were employed to investigate the effects of magnetic field（MF） on the corrosion of Q235 carbon steel in a NaCl solution containing sulphate-reducing bacteria（SRB） or extracellular polymeric substances（EPS）. Results demonstrated that a 150 mT MF enhanced steel corrosion in a SRB-containing NaCl solution by 202% calculated from weight loss with pitting corrosion as the main corrosion type.Either EPS or MF rendered steel corrosion, but a synergistic interaction between MF and EPS boosted up steel corrosion.This synergistic enhancement could be referred to the alteration in orientation of EPS induced by MF. The presence of higher percentage of chloride ions on the carbon steel surface manifested that MF initiated the erosion of chloride ions on the carbon steel coupon.展开更多
基金Item Sponsored by National Natural Science Foundation of China(21276036,51101025)
文摘The effects of sulphate-reducing bacteria （SRB） on the 2205 duplex stainless steel in the sea water and oil industry environments were studied by electrochemical impedance spectroscopy （EIS）, potentiodynamic polarization and microorganism analysis. The results showed that the detected SRB was the non-spore bacillus of about 0.8μm×（1.8--2.2）μm in size and the content of S was about 7. 59% in the corrosion products. SRB contributed to the corrosion evolution which caused the corrosion failure of 2205 duplex stainless steel pipe in the liquid hydrocarbon cooler. During the corrosion process, the produced H2S could significantly influence the anodic process and finally accelerate the corrosion. SEM observation indicated that the distribution of SRB on the surface of 2205 duplex stainless steel was nonuniform. X ray photoelectron spectroscopy analysis revealed that the surface film was composed of Cr2O3, MoO3 , FeS, FeS2, Fe（OH）2 and FeO after immersing the sample in the SRB medium for 14 d.
基金financially supported by the Shenzhen Strategic Emerging Industry Development Special Fund Project (No. JCYJ20130401144744190)the Innovation Foundation of Huazhong University of Science and Technology Innovation Institute (Nos. 2015TS150, 2015ZZGH010)
文摘In this work, surface characterization and electrochemical measurement were employed to investigate the effects of magnetic field（MF） on the corrosion of Q235 carbon steel in a NaCl solution containing sulphate-reducing bacteria（SRB） or extracellular polymeric substances（EPS）. Results demonstrated that a 150 mT MF enhanced steel corrosion in a SRB-containing NaCl solution by 202% calculated from weight loss with pitting corrosion as the main corrosion type.Either EPS or MF rendered steel corrosion, but a synergistic interaction between MF and EPS boosted up steel corrosion.This synergistic enhancement could be referred to the alteration in orientation of EPS induced by MF. The presence of higher percentage of chloride ions on the carbon steel surface manifested that MF initiated the erosion of chloride ions on the carbon steel coupon.
基金supported by the National Natural Science Foundation of China(50971128,51161001)National RD Infrastructure and Facility Development Program of China(2005DKA10400-CT-2-02)~~
