Corrosion Behavior of 690 MPa Grade High Strength Bainite Steel in a Simulated Rural Atmosphere

doi:10.11902/1005.4537.2020.002

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (5): 416-424 DOI: 10.11902/1005.4537.2020.002

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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.

Key words: 690 MPa grade bainite steel rural atmosphere corrosion resistance

Received: 06 January 2020

ZTFLH:

TG174

Fund: National Key Research and Development Program(2017YFB0303800)

Corresponding Authors: HUANG Feng E-mail: huangfeng@wust.edu.cn

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Cite this article:

LIU Haixia, HUANG Feng, YUAN Wei, HU Qian, LIU Jing. Corrosion Behavior of 690 MPa Grade High Strength Bainite Steel in a Simulated Rural Atmosphere. Journal of Chinese Society for Corrosion and protection, 2020, 40(5): 416-424.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.002 OR https://www.jcscp.org/EN/Y2020/V40/I5/416

Table 1 Main chemical compositions of three steels (mass fraction / %)

Fig.1 FE-SEM micrographs of Q690 steel (a), Corten-A steel (b) and Q235 steel (c)

Fig.2 Average corrosion rate and relative corrosion of three steels changes with time

Fig.3 Surface topographies of the Q690 (a, b), Corten-A (c, d) and Q235 (e, f) steels after immersion for different time with rust (a, c, e) and without rust (b, d, f)

Fig.4 XRD patterns of the powdered rust of Q690 steel (a), Corten-A steel (b) and Q235 steel (c) after immersion for different time

Fig.5 Semi-quantitative analysis of phase diffraction patterns of the rust

Fig.6 Cross-sectional morphology of Q690 steel rust layer after immersion for 768 h (a) and the distribution of Fe (b), O (c), Cr (d), Ni (e), Cu (f) element individually

Fig.7 Cross-sectional morphology of Corten-A steel rust layer after immersion for 768 h (a) and the distribution of Fe (b), O (c), Cr (d), Ni (e), Cu (f) element individually

Fig.8 Cross-sectional morphology of Q235 steel rust layer after immersion for 768 h (a) and the distribution of Fe (b), O (c), Cr (d), Ni (e), Cu (f) element individually

Fig.9 Bode plots of Q690 steel (a), Corten-A steel (b) and Q235 steel (c) with rust layer formed at the different immersion time

Fig.10 Equivalent circuit simulating for EIS of three steels at 48 h (a), 192 h and 768 h (b) cyclic immer-sion time

Table 2 EIS fitting results of three corroded steels at different time

Fig.11 Linear polarization curves of Q690 steel (a), Corten-A steel (b) and Q235 steel (c) with rust layer after immersion for different time

Fig.12 Polarization R_p Values of the three steels with rust layer after immersion for different cyclic time

Fig.13 Corrosion depth-time double logarithmic curves of Q690 steel (a), Corten-A steel (b) and Q235 steel (c)

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