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利用X射线光电子能谱分析(XPS)和扫描电子显微镜(SEM)研究了X80管线钢在一种酸性土壤浸出液中硫酸盐还原菌(SRB)腐蚀的产物成分和形貌。结果表明,SRB没有改变样品表面腐蚀产物膜的结构,但其生理过程促进了S从氧化态向还原态的转变,并促进了S在腐蚀产物中的沉积;同时代谢产物磷化物也沉积在腐蚀产物中,改变了腐蚀产物的成分。SRB提高了管线钢局部腐蚀的敏感性,使得腐蚀形式从非均匀腐蚀向局部腐蚀转变。SRB代谢产物和细菌/金属间的直接电子转移可能是促进局部腐蚀萌生的主要原因。
X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) were used to study the composition and morphology of sulfate-reducing bacteria (SRB) in X80 pipeline steel in acid leachate. The results showed that SRB did not change the structure of the corrosion products on the surface of the sample, but its physiological process promoted the transformation of S from oxidation state to reduction state and promoted the deposition of S in the corrosion products. Simultaneously, the metabolites phosphide also deposited in the corrosion In the product, the composition of the corrosion product is changed. SRB increases the sensitivity of local corrosion of pipeline steel, making the corrosion form change from non-uniform corrosion to local corrosion. The direct electron transfer between SRB metabolites and bacteria / metals may be the main reason for promoting local corrosion initiation.