循环冷却水中HEDP对铁细菌腐蚀影响及机理研究

doi:10.11902/1005.4537.2022.123

中国腐蚀与防护学报

2022, Vol. 42

Issue (6): 988-994 DOI: 10.11902/1005.4537.2022.123

研究报告

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循环冷却水中HEDP对铁细菌腐蚀影响及机理研究

许萍(

), 赵美惠, 白鹏凯

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

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

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

引用本文:

许萍, 赵美惠, 白鹏凯. 循环冷却水中HEDP对铁细菌腐蚀影响及机理研究[J]. 中国腐蚀与防护学报, 2022, 42(6): 988-994.
Ping XU, Meihui ZHAO, Pengkai BAI. Effect of Hydroxyethylidene Diphosphonic Acid on Iron Bacteria Induced Corrosion of Carbon Steel in Circulating Cooling Water[J]. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 988-994.

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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。

关键词 ： HEDP, 铁细菌, 微生物腐蚀, 碳钢, 循环冷却水

Abstract：

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.

Key words： HEDP iron bacteria microbial corrosion carbon steel circulating cooling water

收稿日期: 2022-04-22

ZTFLH:

TG172

基金资助:国家自然科学基金(51578035)

作者简介: 许萍,女,1971年生,博士,教授

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https://www.jcscp.org/CN/10.11902/1005.4537.2022.123 或 https://www.jcscp.org/CN/Y2022/V42/I6/988

图1 碳钢试片的平均腐蚀速率

图2 碳钢电极 7 d后的极化曲线图

表1 碳钢电极7 d极化曲线拟合结果

图3 碳钢电极7 d时的Nyquist图

图4 模拟电化学阻抗的等效电路

表2 碳钢电极7 d时电化学阻抗拟合结果

图5 不同工况下碳钢界面腐蚀产物SEM像

图6 不同工况下碳钢表面腐蚀产物拟合结果

表3 不同测试区域内碳钢表面粘附力

图7 不同工况下铁细菌数量变化

图8 生物膜中EPS、PS、PN变化规律

图9 HEDP对铁细菌腐蚀的影响机理示意图

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