摘要
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 ,细菌代谢产物改变了介质的pH ,生物膜厚度增加 ,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 ,在试片表面沉积无菌腐蚀产物膜。将三种膜作腐蚀对比实验 ,结果表明以含菌生物膜腐蚀最重 ,活性腐蚀产物膜次之 ,化学沉积FeS膜最轻 。
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.
出处
《中国腐蚀与防护学报》
CAS
CSCD
2000年第1期41-46,共6页
Journal of Chinese Society For Corrosion and Protection
