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Effect of Combined Potential Polarization on Corrosion of X65 Steel in Seawater Inoculated with Iron Oxiding Bacteria |
LI Zhenxin, LV Meiying, DU Min( ) |
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China |
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Abstract The effect of stepwise cathodic polarizations with two potentials: either -850 mV (vs. SCE) then -1050 mV or -1050 mV then -850 mV on the corrosion behavior of X65 steel in the aged Qingdao seawater inoculated with iron oxidizing bacteria was studied by means of electrochemical techniques, scanning electron microscopy and confocal laser scanning microscopy and Raman spectroscopy. The results show that both of the two stepwise polarizations all can inhibit the IOB induced corrosion. There is little difference in the composition but variation in the content of each constituent of corrosion products formed on X65 steel in the aged Qingdao seawater inoculated with iron oxidizing bacteria by open circuit potential as well as by applying either of the two stepwise polarizations respectively. The polarization by -1050 mV can inhibit IOB adhesion, but cannot completely remove the formed biofilm, which may be the reason why the stepwise polarization by -1050 mV then -850 mV has better protection effect than that by -850 mV then -1050 mV.
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Received: 12 May 2021
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Fund: National Natural Science Foundation of China(51871204) |
Corresponding Authors:
DU Min
E-mail: ssdm99@ouc.edu.cn
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About author: DU Min, E-mail: ssdm99@ouc.edu.cn
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