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| Effect of Pseudomonas on Electrochemical Corrosion Behavior of S45C Steel in Seawater and a Culture Medium |
| CHAI Ke, LUO Qi, WU Jinyi |
| Ministry of Education Key Laboratory of Application Technology of Hainan Superior Resources Chemical Materials, Material and Chemical Engineering College, Hainan University, Haikou 570228, China |
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Abstract The effect of pseudomonas on electrochemical corrosion behavior of 45 carbon steel was comparatively studied in seawater and a culture medium with and without the presence of pseudomonas, by means of microbiological analysis, weight loss method, corrosion potential measurements, EIS, potentialdynamic polarization curve and SEM, etc. The results showed that both pseudomonas and the medium exhibited inhibiting effect for the steel. Organic compounds in the medium could be absorbed onto steel surface and change the cathodic and anodic reaction of the corrosion process. The mechanisms of the effect of pseudomonas on corrosion behavior varied with immersing time: at the initial stage, the dissolved oxygen concentration in the environment was reduced by bacteria metabolism, which slowed down the corrosion rate. By prolonging the corrosion time, however, the partly quantitative accumulation of pseudomonas metabolites, which include alkaline substances and siderophores, finally accelerated the corrosion rate of the steel. Rich nutritious contents in the medium could promote mass propagation of pseudomonas, thus accelerated the influence of pseudomonas on corrosion behavior.
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Received: 19 March 2013
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