磁场对316L不锈钢微生物腐蚀行为的影响

采用循环极化、微生物分析法、扫描电镜及表面能谱分析等方法,研究了磁场对316L不锈钢在含硫酸盐还原菌(SRB)的土壤模拟溶液中的腐蚀行为。结果表明,磁场可以抑制SRB的生长;未外加磁场时316L不锈钢表面膜层以局部堆积为主,加有磁场时,局部堆积明显减小,膜层均匀致密的排列于基体表面;无论有或没有外加磁场,316L不锈钢表面均发生钝化膜破裂型点蚀,未外加磁场时的点蚀电位低于加有磁场时的。在相同的浸泡时间,未外加磁场时循环极化滞后环面积明显比加有磁场时的大,说明磁场可以有效抑制316L不锈钢点蚀的形成与发展,降低316L不锈钢的点蚀诱发能力。

Effect of Magnetic Field on Microbiologically-influenced#$NLCorrosion Behavior of 316L Stainless Steel

The common corrosion behavior of 316L stainless steel is pitting corrosion. In this work, the electrochemical cycle polarization test, microbiological analysis, surface morphology and energy spectrum analysis have been used to investigate the influence of magnetic field on the corrosion of 316L stainless steel in soil simulated solution containing SRB The result showed that magnetic field can inhibit the growth of SRB; The surface film of 316L stainless steel presented local accumulation without magnetic field, when with magnetic field the surface film uniformly arranged on the surface, the local accumulation areas decreased significantly; The pitting corrosion behaviors of 316L stainless steel in soil solution are both film rupture with and without magnetic field, the pitting potential without magnetic field is lower than that with magnetic field. Under the same immersion time, the area of lag ring with magnetic field is smaller than that without magnetic field; The magnetic field could effectively inhibit the formation and development of the pitting corrosion of 316L stainless steel, reduce the ability of induce pitting.