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采用微生物分析方法研究了交流电(均方根电流密度50 A/m~2,频率50 Hz)对土壤浸出液中硫酸盐还原菌(sulfate reducing bacteria,SRB)的生理影响;通过开路电位、动电位极化曲线、电化学阻抗谱等方法研究了交流电和微生物共同作用对Q235钢的电化学行为的影响;利用SEM观测了试样表面腐蚀产物和腐蚀微观形貌.结果表明,均方根电流密度为50A/m~2,频率为50 Hz的正弦交流电对SRB的生理未造成很大影响,但交流电的交变电场降低了微生物膜的吸附性,促进了微生物膜的脱附.实验前期,活性生物膜抑制金属腐蚀,实验后期,微生物代谢产物促进金属腐蚀.金属在交流电作用下,由于整流效应、交变电场作用以及点蚀的自催化效应等,腐蚀速率加快,腐蚀产物疏松.
The physiological effects of alternating current (root mean square current density of 50 A / m ~ 2 and frequency of 50 Hz) on sulfate reducing bacteria (SRB) in soil leachate were studied by means of microbiological analysis. Through open circuit potential, Electrochemical curve and electrochemical impedance spectroscopy were used to study the influence of alternating current and microorganism on the electrochemical behavior of Q235 steel.The corrosion products and corrosion microstructure of Q235 steel were observed by SEM.The results showed that the rms current density was 50A / m ~ 2, the frequency of 50 Hz sine AC SRB physiology did not cause a great impact, but alternating current electric field reduces the adsorption of microbial membranes, and promote the desorption of microbial membranes.In the early experiment, the active biological Membrane inhibition of metal corrosion, the latter part of the experiment, the microbial metabolites promote metal corrosion.Metal ac current, due to the rectification effect, the role of alternating electric field and pitting autocatalytic effect, the corrosion rate, corrosion products loose.