碳钢表面混合与单种细菌腐蚀作用对比研究

doi:10.11896/cldb.18040053

材料导报

2019, Vol. 33

Issue (12): 2055-2061 https://doi.org/10.11896/cldb.18040053

金属与金属基复合材料

碳钢表面混合与单种细菌腐蚀作用对比研究

许萍¹, 任恒阳¹, 魏智刚², 汪长征¹

1 北京建筑大学,城市雨水系统与水环境省部共建教育部重点实验室,水环境国家级实验教学示范中心,北京 100044
2 中铁十六局集团有限公司,北京 100018

A Comparative Study on Corrosion of Mixed and Single Bacteria on Carbon Steel Surface

XU Ping¹, REN Hengyang¹, WEI Zhigang², WANG Changzheng¹

1 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
2 China Railway 16th Bureau Group Co., Ltd., Beijing 100018

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摘要在人工配水环境下,设置空白、大肠埃希氏菌(E. coli)、荧光假单胞菌(P. fluorescens)和混合细菌(E. coli-P. fluorescens)工况,对碳钢试片进行腐蚀实验。通过腐蚀失重法、电化学测试、扫描电镜(SEM)、原子力显微镜(AFM)、微生物活性ATP、微电极、X射线衍射(XRD)和红外光谱等技术研究了单种细菌E. coli、P. fluorescens和混合细菌E. coli-P. fluorescens在碳钢表面的腐蚀行为及其变化。实验结果表明,与空白工况相比,碳钢的腐蚀速率在E. coli工况下增加了27.01%,P. fluorescens工况下降低了48.92%,E. coli-P. fluorescens工况下降低了37.46%。混合细菌工况下,碳钢界面形成了以P. fluorescens为主的网状生物膜结构,腐蚀产物类型、官能团、电化学行为、溶解氧性质等也更接近P. fluorescens工况,说明在两种细菌共同作用中,P. fluorescens占主导地位。

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关键词: 微生物腐蚀混合细菌大肠埃希氏菌荧光假单胞菌碳钢

Abstract: The purpose of the present work is to simulate and comparatively study the microbiologically influenced corrosion on the carbon steel surface. In the artificial water environment, blank, E. coli, P. fluorescens and E. coli-P. fluorescens conditions were set. Carbon steel coupons were placed in the four experimental device and corrosion experiments were carried out. Corrosion behavior and the changes of carbon steel inf-luenced by single bacteria and mixed bacteria were investigated by corrosion weight loss method, electrochemical measurement, AFM, SEM, ATP, microelectrode technology, X-ray diffraction and infrared spectroscopy. The experimental results showed that compared with the average corrosion rate in the blank condition, the E. coli condition increases by 27.01%, the P. fluorescens condition and E. coli-P. fluorescens condition decrease by 48.92% and 37.46%, respectively. In the mixed bacteria condition, there forms a reticular biofilm structure dominated by P. fluorescens at the carbon steel interface, and the corrosion product types, functional groups, electrochemical behavior, and dissolved oxygen are more similar to those under the P. fluorescens condition. This indicated that P. fluorescens exerts the dominant role in the interaction between the two kinds of bacteria.

Key words: microbiologically influenced corrosion mixed bacteria Escherichia coli Pseudomonas fluorescens carbon steel

发布日期: 2019-05-31

ZTFLH:

TU991.38

基金资助: 国家自然科学基金(51578035);北京市属高校基本科研业务费专项资金(X18257;X18256);北京建筑大学研究生创新项目(PG2018043)

通讯作者: xuping@bucea.edu.cn

作者简介: 许萍,北京建筑大学,教授。2013年毕业于北京交通大学市政工程专业,获博士学位。主要从事水资源再利用理论与技术,管道微生物腐蚀与控制技术等研究。承担包括国家自然科学基金、国家重大水专项等在内的科研项目近30项,在国内外重要期刊发表文章70余篇。

引用本文:

许萍, 任恒阳, 魏智刚, 汪长征. 碳钢表面混合与单种细菌腐蚀作用对比研究[J]. 材料导报, 2019, 33(12): 2055-2061.
XU Ping, REN Hengyang, WEI Zhigang, WANG Changzheng. A Comparative Study on Corrosion of Mixed and Single Bacteria on Carbon Steel Surface. Materials Reports, 2019, 33(12): 2055-2061.

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http://www.mater-rep.com/CN/10.11896/cldb.18040053 或 http://www.mater-rep.com/CN/Y2019/V33/I12/2055

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