海水环境中组合电位极化对铁氧化菌腐蚀的影响  

Effect of Combined Potential Polarization on Corrosion of X65 Steel in Seawater Inoculated with Iron Oxiding Bacteria

作　　者：李振欣 吕美英 杜敏[1] LI Zhenxin;LV Meiying;DU Min(Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学化学化工学院,海洋化学理论与工程技术教育部重点实验室,青岛266100

出　　处：《中国腐蚀与防护学报》2022年第2期211-217,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51871204)。

摘　　要：采用电化学测试、扫描电镜、激光共聚焦显微镜、Raman光谱等手段研究了-850 mV (vs. SCE,下同)转-1050 mV和-1050 mV转-850 m V组合电位阴极极化对X65钢在含铁氧化菌(IOB)的海水中腐蚀的影响。结果表明:两种组合电位极化都对IOB腐蚀有一定抑制作用;极化与开路电位下X65钢腐蚀产物种类差别不大,含量有区别。-1050 mV极化可以抑制IOB附着但不能完全去除已形成的生物膜,这是-1050 mV转-850 m V极化保护效果优于-850 mV转-1050 m V极化的原因。The effect of stepwise cathodic polarizations with two potentials: either-850 mV(vs.SCE) then-1050 mV or-1050 mV then-850 mV on the corrosion behavior of X65 steel in the aged Qingdao seawater inoculated with iron oxidizing bacteria was studied by means of electrochemical techniques, scanning electron microscopy and confocal laser scanning microscopy and Raman spectroscopy.The results show that both of the two stepwise polarizations all can inhibit the IOB induced corrosion.There is little difference in the composition but variation in the content of each constituent of corrosion products formed on X65 steel in the aged Qingdao seawater inoculated with iron oxidizing bacteria by open circuit potential as well as by applying either of the two stepwise polarizations respectively. The polarization by-1050 mV can inhibit IOB adhesion, but cannot completely remove the formed biofilm, which may be the reason why the stepwise polarization by-1050 mV then-850 mV has better protection effect than that by-850 mV then-1050 mV.

关 键 词：微生物腐蚀 铁氧化菌 组合电位阴极极化 海水环境 附着 

分 类 号：Q939.98[生物学—微生物学]