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Corrosion of carbon steel influenced by anaerobic biofilm in natural seawater |
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| Authors: | Jizhou Duan Suru Wu Guiqiao Huang Baorong Hou |
| Affiliation: | a Institute of Oceanology, Chinese Academy of Sciences, No. 7 Nanhai Road, Qingdao 266071, China b Qingdao Marine Corrosion Institute, Qingdao 266071, China c College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266003, China |
| Abstract: | The bacteria in the anaerobic biofilm on rusted carbon steel immersed in natural seawater were characterized by culturing and molecular biology techniques. Two types of anaerobic bacterium, sulfate-reducing bacteria (SRB) Desulfovibrio caledoniensis and iron-reducing bacteria Clostridium sp. uncultured were found. The compositions of the rust layer were also analyzed and we found that iron oxide and sulfate green rust were the major components. To investigate the corrosion mechanisms, electrochemical impedance spectra was obtained based on the isolated sulfate-reducing bacteria and mixed bacteria cultured from rust layer in laboratory culture conditions. We found that single species produced iron sulfide and accelerated corrosion, but mixed species produced sulfate green rust and inhibited corrosion. The anaerobic corrosion mechanism of steel was proposed and its environmental significance was discussed. |
| Keywords: | Anaerobic corrosion Sulfate-reducing bacteria Iron-reducing bacteria Iron sulfide Green rust EIS |
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