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| INFLUENCE OF SULPHATE REDUCING BACTERIA ON CREVICE CORROSION BEHAVIOR OF Q235 STEEL |
| YANG Jiaxing1, ZHAO Ping1, SUN Cheng2, XU Jin2 |
1. School of Environmental & Chemical Engineering, Shenyang Ligong University, Shenyang 110159;
2. State Key Laboratory for Corrosion & Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Abstract The crevice corrosion mechanism of Q235 carbon steel in soil leaching solution was studied, using a rectangle blind side device. The width of its aperture is 0.5 mm. The soil leaching solution was prepared in two groups for comparison: with SRB (sulphate reducing bacteria) and without SRB, both being investigated separately. The corrosion behavior of the steel was studied by electrochemical, microbiological and surface analysis methods. Electrochemical impedance spectroscopy (EIS) was measured. The results show that, the capacitive arc of the steel in bacteria containing solution is smaller than that in the aseptic solution at the same stage and the corrosion rate in bacteria containing solution is smaller than that in the aseptic solution. The results declare that SRB promotes the corrosion of the steel. At the same time, along with the aperture increasing, the capacitive arc increases at first, then decreases, and the corrosion rate of the bacteria containing solution is greater.
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Received: 21 September 2010
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Corresponding Authors:
ZHAO Ping
E-mail: pingzhao2000@126.com
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