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| Influence of Environmental Alternation on Early Stage Corrosion of Q235 and 09CuPCrNi-A Steel |
WU Jun1, WANG Xiujing1, LUO Rui1, ZHANG Sanping1( ), ZHOU Jianlong2 |
1. Wuhan Research Institute of Materials Protection, Wuhan 430030, China
2. Wuhan Twin Tigers Coatings Co., LTD, Wuhan 430035, China |
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Abstract The corrosion behavior for carbon steel Q235 and weathering steel 09CuPCrNi-A has been studied by alternative field exposure in a site of urban atmosphere and a site of petrochemical environment at Wuhan metropolis for 180 d and then the steel samples were examined by means of SEM, EDS, XRD and electrochemistry measurement. The results show that the surface of the rust layer is non-uniform with many cracks and pores for the steels exposed both in Wuhan urban atmosphere and Wuhan petrochemical environment; the rust layer formed in the early stage will have an impact on that in the later stage; and the changes in the environment will affect the evolution of the rust layer. The corrosion kinetics and polarization curve results show that the free corrosion current densities of the steels measured after exposure may exist a ranking as follows: Isuccessionally exposure in Wuhan urban atmosphere<Iexposure in Wuhan urban atmosphere/Wuhan petrochemical environment<Iexposure in Wuhan petrochemical environment/Wuhan urban atmosphere<Isuccessionally exposure in Wuhan petrochemical environment.
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