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采用开路电位、电化学极化曲线、电化学阻抗谱(EIS)等方法研究了海洋铁细菌作用下Q235钢的腐蚀行为与腐蚀机理。扫描电子显微镜(SEM)形貌分析结果表明有大量的杆状铁细菌附在Q235钢铁表面。在海洋微生物的影响下,Q235钢的开路电位变小,腐蚀倾向与腐蚀率变大。EIS结果表明在海洋铁细菌作用下Q235钢的交流阻抗模值减少,而且大大降低了Q235钢的极化电阻和表面膜的电阻。微生物的附着促进了钢材表面的溶解,使其表面氧化膜层消失,进而形成了疏松不致密的生物膜层,从而加速了其腐蚀进程。
The corrosion behavior and corrosion mechanism of Q235 steel under the action of iron bacteria were studied by open circuit potential, electrochemical polarization curve and electrochemical impedance spectroscopy (EIS). Scanning electron microscopy (SEM) morphology analysis results show that a large number of rod-shaped iron bacteria attached to Q235 steel surface. Under the influence of marine microorganisms, the open circuit potential of Q235 steel becomes smaller, and the corrosion tendency and corrosion rate become larger. The results of EIS show that the AC impedance of Q235 steel is reduced under the action of marine iron bacteria, and the polarization resistance and surface film resistance of Q235 steel are greatly reduced. Microbial attachment promotes the dissolution of the steel surface, so that the surface oxide film disappears, and then formed a loose and dense biofilm layer, thus accelerating its corrosion process.