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| Effect of Sulfate Reducing Bacteria on Corrosion Behavior of Cu in Circulation Cooling Water System |
Meng MEI, Hongai ZHENG( ), Huida CHEN, Ming ZHANG, Daquan ZHANG |
| College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China |
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Abstract The microbe induced corrosion of Cu in circulation cooling water system was investigated in the presence of sulfate reducing bacteria by means of electrochemical measurement and surface analysis techniques. Meanwhile, the inhibition effect of cysteine on Cu was also assessed. The results show that, polarization resistance of Cu increased first and then decreased in the water with sulfate reducing bacteria, and the polarization resistance of Cu is 25.82 kΩcm2 lower than that in the sterile water. The corrosion current density of Cu reduced first and then increased, while the electrochemical impedance spectroscopy presented the same tendency. In the sulfate reducing bacteria containing water, the addition of different concentrations of L-cysteine can lead the decline of the corrosion current density Icorr and the expansion of the radius of electrochemical impedance of Cu, particularly with the concentration of 10-3 mol/L, L-cysteine exhibits the best corrosion inhibition effect for Cu in the water with sulfate reducing bacteria.
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Received: 02 September 2016
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