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Inhibition Effect of Pseudoalteromonas Piscicida on Corrosion of Q235 Carbon Steel in Simulated Flowing Seawater |
Sai YE1,2, Moradi Masoumeh2, Zhenlun SONG2, Fangqin HU2, Zhaohui SHUN2, Jianping LONG1() |
1 College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China; 2 Key Laboratory of Marine New Materials and Related Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China |
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Abstract Pseudoalteromonas piscicida was separated and extracted from seafloor sediments located in offshore waters of Zhoushan institute of marine corrosion at Zhoushan islands of the East China Sea. Then the bacterium was inculated to laboratorial bottle that placed in a constant temperature incubator shaker and to an incubator with environment of simulated lowing sea water, respectively. The effect of Pseudoalteromonas piscicida on the corrosion of Q235 carbon steel in the above two bacterial culture systems has been studied by means of electrochemical workstation, scanning electron microscope and Fourier infrared spectrometer. Results showed that this bacterium could inhibit effectively the corrosion of Q235 carbon steel in seawater. The impedance of the carbon steel was enhanced more obviously in laboratorial bottle and its surface was completely covered with an uniform and dense biofilm, while the uneven biofilm formed on the surface of carbon steel in the simulated flowing seawater system, seawater can direct contact the substrate via holes and crevices which were randomly distributed throughout the biofilm, provided conditions for the formation of oxygen concentration cell, therefore weakened the corrosion resistance of carbon steel. FT-IR spectrum showed there were differences in secretory macromolecules for the same bacterium but cultured respectively in the two culture systems after 7 d.
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Received: 09 September 2017
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Fund: Supported by National Natural Science Foundation of China (5161101078), President's Fellowship Programme of CAS (PIFI), Zhejiang Public Welfare Project (2015C31031) and Ningbo Natural Science FundProject (2015A610070) |
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