摘要
油田采出水中Cl-含量是影响材料微生物腐蚀的重要因素,以往对此研究较少。通过电化学阻抗谱(EIS)、扫描电镜(SEM)、能谱(EDS)及荧光显微镜等研究了Cl-浓度分别为200,150,100,30,6 g/L的模拟油田采出水介质中硫酸盐还原菌(SRB)对316L不锈钢腐蚀行为的影响。结果表明:在30 g/L Cl-时316L不锈钢表面细菌附着量明显高于其他盐度,Cl-浓度高于100 g/L时不锈钢表面基本无细菌附着;在低盐度含SRB介质中,试样电荷转移电阻(Rct)较小,耐腐蚀性能较低;在低盐度下试样表面生物膜疏松多孔,有胞外聚合物、腐蚀产物和代谢产物形成,表面的Fe含量明显低于高盐度介质,而C含量较高,SRB的存在增大了试样的腐蚀溶解速度。
The microbiologically influenced corrosion behavior of 316 L stainless steel in sulphate-reducing bacteria( SRB) inoculated Postgate's C( PGC) containing 200,150,100,30,6 g /L Cl-was evaluated based on electrochemical impedance spectroscopy testing as well as analyses of scanning electron microscopy,energy dispersive spectroscopy and fluorescence microscopy. Results showed that when the concentration of Cl-was 30 g /L,the amount of bacteria attached to the steel surface was significantly higher. When Cl-concentration was higher than 100 g /L,basically no SRB was attached to the steel surface. Besides,the charge transfer resistance of the steel samples exposed to SRB inoculated PGC with low salinity was lower. Moreover,the marine biofilms on the steel surface immersed in low salinity conditions were more loose and porous. In the low salinity conditions,the concentration of Fe in the surface film was much lower,and the concentration of C was significantly higher. In general,SRB promoted the corrosion and dissolution rate of the steel sample.
出处
《材料保护》
CSCD
北大核心
2014年第5期57-60,共4页
Materials Protection
基金
中国科学院重要方向资助项目(KZCX2-EW-205)资助
