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Influence of Magnetic Field on Corrosion of Pure Cu in Artificial Seawater with Multispecies Aerobic Bacteria |
WEI Xiaoyang1,2,MORADI Masoumeh2,YANG Lijing2,LV Zhanpeng1,ZHENG Bizhang2,SONG Zhenlun2( ) |
1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China 2. Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China |
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Abstract The effect of static permanent magnetic fields of 28 and 60 mT on the growth rate of marine aerobic bacteria isolated from the East China Sea is studied. The corrosion behavior of pure Cu was also investigated in the artificial seawater with marine aerobic isolated bacteria in the presence of magnetic field by means of electrochemical measurement techniques and surface analysis methods. The formation of biofilm on Cu surface was observed by confocal laser scanning microscopy (CLSM). CLSM images showed that the formation and falling off of the biofilm were accelerated in the presence of magnetic field,while the effect of 60 mT magnetic field was stronger than that of 28 mT. FTIR analysis confirmed that the biofilm structures were changed when magnetic field was introduced to the system, the composition of biofilm changed from lipids, proteins, and carbohydrates to proteins and carbohydrates, while, the amount of protein decreased, but that of the carbohydrate increased. Besides, with the increase of magnetic field intensity, the lipid content decreased. The results of XPS analysis further confirmed that magnetic field affected the nature of corrosion products. The pitting was observed on the Cu surface after removing the formed biofilm using FE-SEM, nevertheless the number and size of pits on the Cu were markedly decreased in the presence of magnetic field. EIS results showed the impedance of pure Cu was significantly increased in the presence of magnetic field. It is concluded that magnetic field could accelerated the formation and falling off of the biofilm by affecting its composition and structure, therewith, inhibit the microbial corrosion process of pure Cu.
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Received: 07 November 2018
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Fund: Supported by Natural Science Foundation of Ningbo(2018A610211);Ningbo 135 Marine Economic Innovation and Development Demonstration Project(NBHY-2017-Z2) |
Corresponding Authors:
Zhenlun SONG
E-mail: songzhenlun@nimte.ac.cn
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