Effect of Sulfate-Reducing Bacteria on Corrosion Behavior of the Low-alloy Bare Steel for Hull
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摘要: 船体舱室底部存积的油污水为腐蚀微生物的生长繁殖提供了有利条件。为了研究腐蚀微生物硫酸盐还原菌(SRB)对某新型船体低合金钢腐蚀的影响,采用荧光显微技术、失重分析、电化学分析、腐蚀产物成分分析及微区成分分析等手段,研究了取自舱底环境中分离提纯的SRB对船体低合金钢腐蚀行为的影响。结果表明,在SRB腐蚀初期,胞外聚合物(EPS)对全面腐蚀有一定的抑制作用,但随着时间的延长,铁硫化合物层可作为阴极与裸露部位的小阳极发生反应,加上SRB的共同作用,加速局部破裂处的阳极溶解,促进点蚀。在整个浸泡周期内,船体低合金钢在SRB介质中的腐蚀电流密度均大于灭菌介质中的,且年平均腐蚀速率是灭菌介质中的1.36倍。Abstract: In some cabins inside the hull, oil and sewage are often accumulated at the bottom of the cabin due to the oil leakage of shafting and piping and the domestic sewage not cleaned in time, which provides favorable conditions for the growth and reproduction of corrosive microorganisms. The effect of sulfate-reducing bacteria (SRB), isolated and purified from bilge environment, on the corrosion of the new-type hull low alloy steel is studied by means of fluorescence microscopy, weight loss analysis, electrochemical analysis, corrosion product composition analysis and composition analysis. The results show that in the initial stage of SRB corrosion, extracellular polymer substances (EPS) have a certain inhibitory effect on the overall corrosion. However, with the extension of time, the iron sulfur compound layer can act as the cathode, together with the small anode at the exposed part and the SRB, it can accelerate the dissolution of the anode at the fracture and promote pitting corrosion. Within the 14 days of period, the corrosion current density in the SRB medium is greater than that in the sterilization medium, and the annual average corrosion rate is 1.36 times of that in the sterilization medium.
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