Localised corrosion induced by a marine vibrio |
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| Affiliation: | 1. College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China;2. Key Laboratory for Water Quality and Conservation of the Pearl River Delta, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China;3. Engineering Technology Research Center for Corrosion Control and Protection of Materials in Extreme Marine Environment, Guangzhou Maritime University, Guangzhou 510725, China;1. Department of Civil and Environmental Engineering, Florida International University, Miami, FL, US;2. State Materials Office, Florida Department of Transportation, Gainesville, FL, US;1. Key Laboratory of Marine Environmental Corrosion and Biofouling, Institute of Oceanology, Chinese Academy of Science, Qingdao 266071, China;2. Open studio for Marine Corrosion and Protection, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;3. Center for Ocean Mega-Science, Chinese Academic of Sciences, Qingdao 266071, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;5. State Key Laboratory of Marine Resource Utilization in Souh China Sea, Hainan University, Haikou 470228, China;6. College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China;7. Shandong Key Laboratory of Biophysics, Institute of Biophysics, Dezhou University, Dezhou 253023, China;1. Curtin Corrosion Centre, WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Bentley, WA, Australia;2. Woodside Energy Ltd., Perth, 6000 WA, Australia |
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| Abstract: | The corrision of mild steel in media with and without bacterial cultures was assessed using potentiostatic and potentiodynamic techniques and the production of biofilm on the metal surface was studied by scanning electron microscopy.Metal in a solution consisting of the inorganic components of Postgate's medium C was not passivated, but a passive surface was indiced by the addition of lactate, citrate, or phosphate. The breakdown potential (Eb of the passivated metal was most anodic for phosphate. No significant change in the electrochemical behaviour of the steel was seen when the formulation of Postgate's medium C was completed by the addition of yeast extract, but chloride, added to allow the growth of Vibrio alginolyticus, caused a reduction in the Eb value.Vibrio alginolyticus reduced the Eb value in Postgate's medium C from −0·37 to −0·43V, indicating its corrosive capacity. This value was reduced still further, to −0·60V, when sulphate-reducing bacteria were also present.Scanning electron microscopy showed the presence of colonies of V. alginolyticus on the metal surface. When cleaned, it was apparent that intense pitting had occurred beneath these colonies.It is suggested that V. alginolyticus may promote chemical or SRB-induced corrosion by removing a passive film from the metal, allowing aggressive species such as sulphides to affect the surface. |
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