METALS AND METAL MARTIX COMPOSITES |
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A Comparative Study on Corrosion of Mixed and Single Bacteria on Carbon Steel Surface |
XU Ping1, REN Hengyang1, WEI Zhigang2, WANG Changzheng1
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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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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.
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Published: 31 May 2019
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Fund:This work was financially supported by the National Natural Science Foundation of China (51578035), the Fundamental Research Funds for Beijing Universities (X18257,X18256) and the BUCEA Post Graduate Innovation Project (PG2018043). |
About author:: Ping Xu received her Ph.D. degree in municipal engineering from Beijing Jiaotong University in 2013. She is currently a professor in Beijing University of Civil Engineering and Architecture and mainly engages in water reuse theory and technology, pipeline microbial corrosion and control technology research. She undertakes nearly 30 scientific research projects including the National Natural Science Foundation and the National Key Water Project, and has published more than 70 journal papers in important journals. |
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