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| Corrosion Resistance of Welded Joints of Q690 Bainite Bridge Steel in Simulated Rural Atmosphere |
WANG Xinyu, HUANG Feng( ), LIU Haixia, YUAN Wei, LIU Jing |
| Hubei Engineering Technology Research Center of Marine Materials and Service Safety, State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China |
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Abstract The corrosion behavior of Q690 bainitic bridge steel and its welded joints in a simulated rural atmospheric environment were studied via cyclically wetting and drying method, electrochemical testing, X-ray diffraction (XRD), field emission electron probe micro analysis (FE-EPMA) and other modern surface analysis techniques. The results showed that the corrosion processes of Q690 steel and its welded joint may be differentiated as two stages, namely, the accelerated corrosion stage with n>1 and the deceleration corrosion stage with n<1. In the early stage of corrosion, owing to the obvious microstructure differences among BM (base metal), HAZ (heat affected zone) and WZ (weld zone) of Q690 steel welded joint, galvanic corrosion could emerge, i.e., WZ and HAZ act as anode and BM as cathode, resulting in worse corrosion resistance of the former two, in the contrast to BM. In the later stage of corrosion, as the stable rust layer formed, the difference in corrosion resistance between Q690 steel and welded joints was reduced.
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Received: 24 September 2021
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| Fund: Innovation group of Hubei Province Natural Science Foundation(2021CFA023) |
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Corresponding Authors:
HUANG Feng
E-mail: huangfeng@wust.edu.cn
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About author: HUANG Feng, E-mail: huangfeng@wust.edu.cn
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