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Effect of Bacillus Vietnamensis as an Iron Oxidizing Bacterium on Corrosion of 2507 Duplex Stainless Steel in Sea Water |
Zhaohui SUN1,2,Moradi Masoumeh1,Lijing YANG1,Bagheri Robabeh1,Zhenlun SONG1( ),Yanxia CHEN2 |
1. Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China 2. Nano Science and Technology Institute, University of Science and Technology of China, Hefei 230026, China |
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Abstract Bacillus vietnamensis was collected from the East China Sea at the corrosion test site of Zhoushan Island, Zhejiang Province, and then separated as a bacterial strain. The effect of Bacillus vietnamensis on the corrosion of 2507 duplex stainless steel (2507 DSS) in sea water was investigated using different electrochemical-, surface analysis- and spectroscopy-methods. The results showed that the open circuit potential shifted to negative direction in the presence of this bacterium because of the activation of the 2507 DSS surface. The corrosion rate is measured by potentiodynamic polarization method and demonstrated that the corrosion rate of 2507 DSS increased in the presence of the bacterium. FE-SEM images also confirmed the above results and showed a biofilm formed on the 2507 DSS surface when exposed to Bacillus vietnamensis. FTIR spectrum showed several peaks at the range of 900~1200 and 1500~1600 cm-1 which are related to exopolysaccharide and proteins. A wide peak also observed at 2800~2900 cm-1 which makes this bacterium different from other bacteria. It is surprising that these peaks only can be observed after long exposure times and might be related to the biofilm formation on the steel surface. EIS results also showed the presence of biofilm on the surfaces. It can be concluded that the heterogenic biofilm and iron oxide on the steel surface accelerated the corrosion process of 2507 DSS surfaces.
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