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Microbial Corrosion of Q235 Steel in Acidic Red Soil Environment |
Libao YU1,2, Maocheng YAN1(), Binbin WANG3, Yun SHU1, Jin XU1, Cheng SUN1 |
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 2 University of Chinese Academy of Sciences, Beijing 100049, China 3 PetroChina West Pipeline Company, Chengdou 610041, China |
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Abstract Microbial corrosion induced by sulphate-reducing bacteria (SRB) for carbon steel Q235 beneath coating defects was studied by means of electrochemical impedance spectroscopy (EIS), polarization measurement and microscopic surface observation. Results showed that, in acid red soil environment, SRB have no significant effect on the electrochemical process during the initial environmental adaptation period. Then in the next period, the respiratory metabolic activities of the growing SRB lead to decrease of the free corrosion potential of Q235 steel and accelerate corrosion process of the carbon steel. Bacteria can react with iron oxides in the red soil, causing microbial dissimilatory reduction of iron oxides, which promotes electrochemical corrosion process of the carbon steel.
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Received: 14 January 2017
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