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硫酸盐还原菌(SRB)对碳钢的腐蚀与其腐蚀产物FeS膜的状态有关。实验表明,当介质中的Fe~(2+)离子浓度低于50mg/L时,SRB的存在对碳钢起保护作用,其腐蚀产物膜致密,阻碍了介质与铁的作用,而且生物膜(bioilm)中的细菌数少于介质中的菌量;当介质中Fe~(2+)浓度高于50mg/L时,SRB的腐蚀产物膜厚且疏松,FeS成为腐蚀微电池的阴极,对碳钢的腐蚀起促进作用,生物膜的存在影响了杀菌剂的杀菌效能,膜越厚,杀菌效果越低。
Sulfate-reducing bacteria (SRB) on carbon steel corrosion and its corrosion products FeS film status. Experiments show that when the concentration of Fe 2+ ions in the medium is less than 50mg / L, the presence of SRB plays a protective role on the carbon steel, and the corrosion product film is dense, hindering the interaction between the medium and iron, and the biofilm When the concentration of Fe 2+ in the medium was higher than 50 mg / L, the corrosion products of SRB were thick and loose, and FeS became the cathode of the corrosion microcell. Corrosion of steel plays a catalytic role. The presence of biofilm affects the germicidal efficacy of the bactericide. The thicker the membrane, the lower the bactericidal effect.