Metal corrosion by aerobic bacteria isolated from stimulated corrosion systems: Effects of additional nitrate sources |
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| Institution: | 1. Department of Chemical and Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University, Athens, OH 45701, USA;2. Department of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China;3. PTT Exploration and Production, Chatuchak, Bangkok 10900, Thailand;4. Corrosion & Protection Center, University of Science & Technology Beijing, Beijing 100083, China;1. Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, China;2. National Materials Corrosion and Protection Data Center, Beijing, China;3. State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China;4. Corrosion and Protection Division, Shenyang National Laboratory for Material Sciences, Northeastern University, Shenyang, China;1. Department of Chemical and Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University, Athens, OH 45701, USA;2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;3. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China |
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| Abstract: | Many microorganisms are reported to influence the corrosive behaviour of mild steel and stainless steel in different habitats. In this study, 40 bacterial strains were isolated from corroded mild steel and stainless steel coupons in the nitrate supplemented environments. The corrosion abilities of the isolates against the mild steel and stainless steel coupons were tested with or without additional nitrate sources. The presence of bacterial isolates alone stimulated the corrosion of mild steel coupons. Most of the bio-corrosion processes of mild steel coupons were mitigated by adding nitrate supplement with bacterial isolates. The effects of bacterial isolates and additional nitrogen sources on corrosion of stainless steels were varied. Not all bacterial isolates stimulated the corrosion on stainless steel during the study period. Unlike the effects on mild steel coupons, additional NaNO3 might stimulate, retard the corrosion rate by the bacterial isolates or have limited effects. Similar results were obtained when NH4NO3 was used. Phylogenetic analysis demonstrated that all isolates were closely related. The majority of the bacterial isolates from corroded metal coupons were identified as Bacillus species. Others were identified as Pseudomonas sp., Marinobacter sp., and Halomonas species. The results prove that the isolated aerobic microorganisms do play a role in the corrosion process of stainless and mild steel. Adding additional nitrate sources might be a tool to mitigate corrosion of mild steel which was stimulated by the presence of bacteria. However, to prevent the corrosion of stainless steels, it might need a trial and errors approach in each case. |
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| Keywords: | MIC Nitrate supplement Mild steel Stainless steel Phylogenetic analysis |
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