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| EFFECT OF MICROBES ON EARLY CORROSION BEHAVIOR OF Q235 STEEL IN FRESHWATER |
| JIANG Li1; CAO Gang1; MAO Xuhui1;LIN An1; ZHU Hua1; GAN Fuxing1;2 |
1. Department of Environmental Engineering; School of Resource and Environmental Science; Wuhan University; Wuhan 430072;
2. State Key Laboratory for Corrosion and Protection; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016 |
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Abstract The effect of microbes on the early corrosion behavior of Q235 steel in fresh waters was studied using immersion tests, electrochemical measurements and surface analysis techniques. In the field immersion test at Dan Jiangkou reservoir in China, the corrosion weight loss of Q235 steel increased as the immersion water depth increased. The reason may be that the microbe amount (especially algae amount) decreased with water depth increasing, which resulted in the biofilm formed on the surface of coupons with weak density and reduced coverage area. Therefore, more surface of Q235 steel were exposed to water and the corrosion weight loss increased. This conclusion was also confirmed by the electrochemical measurements and immersion test in natural freshwater. The results of the scanning electron microscopy (SEM) and Fourier transform infra-red (FT-IR) spectra further confirmed that the surface film formed in eutrophic freshwater was thicker and with more complex corrosion products.
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Corresponding Authors:
GAN Fuxing
E-mail: fxgan88@163.com
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