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利用间歇式方法培养海水中硫酸盐还原菌和需钠弧菌,采用自腐蚀电位、极化曲线、冷场扫描电镜观察等方法,研究了304不锈钢在硫酸盐还原菌和需钠弧菌共同作用下的腐蚀电化学行为,分析了东海中的微生物腐蚀特征和机理.结果表明:硫酸盐还原菌和需钠弧菌在混合培养过程中相互促进生长,在混合微生物介质中的腐蚀速率大于在单一微生物中的腐蚀速率;混合微生物的共同作用使微生物膜加大加厚以及产生更多的腐蚀产物和代谢物,加速了不锈钢钝化膜的溶解,进而加速了304不锈钢表面的点蚀.
Sulfate-reducing bacteria and Pseudomonas aeruginosa in seawater were cultivated by intermittent method. The effects of sulfate-reducing bacteria and sodium-paclitaxel on the corrosion resistance of 304 stainless steel were studied by self-corrosion potentials, polarization curves and cold field scanning electron microscopy. The results showed that Sulfate-reducing bacteria and Stenotrophomonas galvatus could promote the growth of each other in the mixed culture process, and the corrosion rate in the mixed microbial medium was higher than that in the single microorganism ; The combined action of the mixed microorganisms increases the thickening of the microbial membrane and produces more corrosion products and metabolites, accelerates the dissolution of the stainless steel passivation film, thereby accelerating the pitting corrosion on the 304 stainless steel surface.