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Corrosion Behavior of 690 MPa Grade High Strength Bainite Steel in a Simulated Rural Atmosphere |
LIU Haixia1,2, HUANG Feng1,2(), YUAN Wei1,2, HU Qian1,2, LIU Jing1,2 |
1 State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China 2 Hubei Engineering Technology Research Center of Marine Materials and Service Safety, Wuhan University of Science and Technology, Wuhan 430081, China |
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Abstract The long-term corrosion behavior of 690 MPa high-strength bridge steel (referred as Q690 steel) in a simulated rural atmosphere was investigated via wet/dry cyclic test with wetting in distilled water and drying in air, as well as electrochemical impedance spectroscopy (EIS), field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), electron probe (EPMA) and other surface testing techniques. The results indicate that the corrosion process of Q690 steel can be differentiated as two stages during the whole corrosion process, namely the accelerated and the decelerated stages. In the early stage of corrosion, the corrosion resistance of Q690 steel with microstructure of lath bainite (LB) is better than that of Corten-A steel with microstructure of ferrite (F) and pearlite (P). In the later stage of corrosion, the enrichment of Cr element and the increase of α-FeOOH in the rust scale of Q690 steel have enhanced the protectiveness of the rust scale, leading to the decrease of the corrosion rate of Q690 steel, hence which shows significantly better corrosion resistance than the Corten-A steel.
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Received: 06 January 2020
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Fund: National Key Research and Development Program(2017YFB0303800) |
Corresponding Authors:
HUANG Feng
E-mail: huangfeng@wust.edu.cn
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