生物膜对碳钢腐蚀的影响

由江汉油由田采油厂污水中分离，提纯出来的硫酸盐还原菌菌株，采用ＡＰＩＲＰ－３８推荐使用的培养基生成生物膜，利用交流阻抗技术研究了生物膜与腐蚀之间的关系。细胞新陈代谢产物及腐蚀产生的分析借助于电子探针及气相色谱／质谱联用技术。

EFFECTS OF BIOFILM ON CORROSION OF CARBON STEEL

In this paper, the biofilm of sulfate reducing bacteria (SRB) which plays an important role in corrosion of carbon steel under anaerobic condition has been studied. The postgate medium was used to culture Jianghan oilfield SRB. Electrochemical impedance spectroscopy (EIS) was used to analyse the electrode process of carbon steel with SRB biofilm. The advantage of EIS lies in its minor disturbance of surface effect of the biofilm. X ray diffraction and gas chromatography and mass spectrometry (GC/MS) techniques were used to analyse the corrosion products and the metabolites of SRB. The results showed that the main metabolites of SRB sampled from Jianghan oilfield were butanic and benzoic acid and the corrosion products contained FeS and Fe 2P. The variation of activity of the SRB biofilm with SRB growth can be found from the EIS in SRB inoculation media. The extracellular polymeric substance of biofilm stimulated the concentration of nutrition and corrosion products, so it could accelerate the corrosion process.