循环冷却水中HEDP对铁细菌腐蚀影响及机理研究  

Effect of Hydroxyethylidene Diphosphonic Acid on Iron Bacteria Induced Corrosion of Carbon Steel in Circulating Cooling Water

作　　者：许萍[1] 赵美惠 白鹏凯 XU Ping;ZHAO Meihui;BAI Pengkai(National Demonstration Center for Experimental Water Environment Education,Key Laboratory of Urban Stormwater System and Water Environment,Ministry of Education,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学城市雨水系统与水环境教育部重点试验室水环境国家级试验教学示范中心,北京100044

出　　处：《中国腐蚀与防护学报》2022年第6期988-994,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51578035)。

摘　　要：采用腐蚀失重法、电化学技术、扫描电镜(SEM)、X射线光电子能谱(XPS)、原子力显微镜(AFM)、激光共聚焦显微镜(CLSM)和生化技术等手段,探究了循环冷却水系统中碳钢表面羟基乙叉二膦酸(HEDP)对铁细菌(IB)的腐蚀行为和生物膜特性的影响及机理。结果表明,HEDP使铁细菌腐蚀速率降低了68.72%,腐蚀电流密度减小了56.93%,腐蚀电位正移,且极化曲线中阴极斜率的增幅远高于阳极,说明了HEDP通过减缓阴极反应抑制了铁细菌的腐蚀;与此同时,在HEDP的作用下,铁细菌增加了0.3~1.0个数量级,EPS分泌量上升了23.91%,生物膜结构为IB-EPS-IB,反映出HEDP能够刺激铁细菌的生长和EPS的分泌,导致生物膜结构薄且致密。本研究可为深入探讨循环冷却水系统中的腐蚀理论及其控制方法提供支持。The effect of hydroxyethylidene diphosphonic acid(HEDP) on the corrosion behavior and biofilm properties of iron bacteria(IB) on carbon steel surface in the circulating cooling water system was investigated by means of corrosion mass loss method, electrochemical technology, scanning electron microscope(SEM), X-ray photoelectron spectroscopy(XPS), atomic force microscope(AFM), confocal laser microscope(CLSM) and biochemical technology. The results showed that in the presence of HEDP,the iron bacteria induced corrosion rate of carbon steel reduced by 68.72%, correspondingly the corrosion current density decreased by 56.93%, the corrosion potential shifted positively, and the increase in the slope of the cathode in the polarization curve was much higher than that of the anode. The cathodic reaction inhibited the corrosion of iron bacteria;at the same time, under the action of HEDP, iron bacteria increased by 0.3~1.0 orders of magnitude, the secretion amount of extracellular polymeric substance(EPS) increased by 23.91%, and the biofilm structure was IB-EPS-IB, which reflected that the presence of HEDP was able to stimulate the growth of iron bacteria and the secretion of EPS, resulting in the formation of a thin and compact biofilm. This study can provide support for the in-depth study of corrosion theory and control methods in circulating cooling water systems.

关 键 词：HEDP 铁细菌 微生物腐蚀 碳钢 循环冷却水 

分 类 号：TG172[金属学及工艺—金属表面处理]