SRB生物膜与碳钢腐蚀的关系

利用间歇式方法培养硫酸盐还原菌（ＳＲＢ）并制备ＳＲＢ生物膜，研究表明，随着细菌的生长，细菌代产物改变了介质的ＰＨ，生物膜百度增加，膜中含菌量升高。在３％ＮａＣｌ水溶液中，覆盖有不同生长期生物膜的碳钢试片的腐蚀速度有明显的差异；电子能谱对生物膜表面分析结果表明，不同生长期生物膜腐蚀产物的Ｆｅ／Ｓ比各不相同。为了验证生物膜中主要腐蚀因素，利用化学方法在试片表面沉积ＦｅＳ膜，利用细菌滤膜隔离ＳＲＢ，在度

INFLUENCE OF SRB BIOFILM ON CORROSION OF CARBON STEEL

The effects of biofilms of Sulfate Reducing Bacteria (SRB) on carbon steel have been studied. API RP-38 media were used to culture SRB in batch and prepare SRB biofilms. The results show that the biofilms become thicker with the growth of SRB. Moreover, corrosion potential of the electrode varies with time. While the pH of the media with SRB changes from 7.2 to 6.0, the count of SRB in biofilms increases. The corrosion rates of carbon steel coupons covered by biofilms with different growth periods in 3% NaCl Solution are remarkably distinctive. EDXA results present that the components of corrosion products in biofilms with different growth period are different. Furthermore, a FeS film was prepared using chemosynthesis and a biofilm was prepared by biological method. The corrosion rates for the three sorts of film were compared.The corrosion rates of coupons with SRB biofilms are larger than these of coupons with the other two films. The corrosion mechanism is mainly attributed to acid attack.