Corrosion Behavior of Q345q Steel with Oxide Scale in Simulated Typical Atmospheric Environmentin Northwest China

doi:10.11901/1005.3093.2019.088

Chinese Journal of Materials Research

2019, Vol. 33

Issue (10): 749-762 DOI: 10.11901/1005.3093.2019.088

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Corrosion Behavior of Q345q Steel with Oxide Scale in Simulated Typical Atmospheric Environmentin Northwest China

ZHANG Yanwen^1,²,GUO Tieming^1,²(

),SONG Zhitao^1,²,NAN Xueli^1,²,XU Xiujie^1,²,DONG Zhilin^1,²

1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China

Cite this article:

ZHANG Yanwen,GUO Tieming,SONG Zhitao,NAN Xueli,XU Xiujie,DONG Zhilin. Corrosion Behavior of Q345q Steel with Oxide Scale in Simulated Typical Atmospheric Environmentin Northwest China. Chinese Journal of Materials Research, 2019, 33(10): 749-762.

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Abstract

The structure of the oxide scale on the as received hot-rolled bridge steel Q345q and the corrosion behavior of the steel Q345q with oxide scale in three simulated atmospheric environments in Northwest China were studied by XRD, scanning electron microscopy, electrochemical technique and wet-dry alternating corrosion test. The results show that the hot-rolled oxide scale composes mainly of Fe₃O₄ and Fe₂O₃, which is porous with cracks and other defects. After the dry-wet alternating accelerated corrosion test of the steel Q345q with oxide scale, although the corrosion weight loss is the highest in NaHSO₃ solution, the free-corrosion potential increases with the corrosion time, and the free-corrosion current density decreases in the later stage of corrosion. As far as the morphology of the rust layer and the ratio of γ/α* are concerned, the rust layer formed on the steel presents good stability; However, in deicing salt solution, the corrosion rate is the smallest, but the steel suffered mainly from Cl^--dominated pitting corrosion with the corrosion characteristics of "large cathode and small anode". Its corrosion products contain such as β-FeOOH and HFeCl₄(H₂O)₆, which results in loose rust layer with poor protectiveness and increased free-corrosive current density; In deicing salt+NaHSO₃solution, both pitting corrosion and general corrosion occur. Due to the synergistic effect of Cl^- and HSO₃^-, the autocatalytic effect of a part of Cl^- is reduced, but most α-FeOOH is converted from β-FeOOH, which resulted in the poor protective rust layer.

Key words: metallic materials Q345q steel oxide scale deicing salt sodium bisulfite mixed solution typical atmosphere in northwest China

Received: 30 January 2019

ZTFLH:

TG172.3

Fund: National Natural Science Foundation of China(51461029);Guangdong Sailing Program to Introduce Innovative Entrepreneurial Team of Special Funding(2015YT02G090);Scientific Research Projects of Gansu Transportation Department(2017-16);Scientific Research Projects of Gansu Transportation Department(2017-19)

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	Yanwen ZHANG
	Tieming GUO
	Zhitao SONG
	Xueli NAN
	Xiujie XU
	Zhilin DONG

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.088 OR https://www.cjmr.org/EN/Y2019/V33/I10/749

Table1 Chemical composition of Q345q steel (%, mass fraction)

Table2 Compositions of three corrosion solutions

Fig.1 The corrosion kinetics curves of Q345q with oxide scale in three different solutions (a) weight gain, (b) corrosion rate

Fig.2 Fitting curves of

?

W as a function of lgt (a) deicing salt, (b) NaHSO₃, (c) mixed solution

Fig.3 XRD spectra of Q345q steel with oxide scale (a) before and after corrosion for different time in (b) deicing salt, (c) NaHSO₃ and (d) deicing salt+ NaHSO₃ solutions

Table 3 Relative contents of corrosion products and α/γ* values for Q345q steel with oxide scale after corrosion for 480 h

Fig.4 Macrographs of Q345q steel with oxide scale after corrosion in (a~d) deicing salt, (e~h) NaHSO₃ and (i~l) mixed solutions for (a, e, i) 24 h, (b, f, j) 192 h, (c, g, k) 288 h and (d, h, l) 480 h

Fig.5 Surface (a) and Cross-sectional (b) morphologies of original oxide scale of Q345q steel

Fig.6 Surface micromorphologies of Q345q steel with oxide scale after corrosion in (a~c) deicing salt, (d~f) NaHSO₃ and (g~i) deicing salt+NaHSO₃ solutions for (a, d, g) 24 h, (b, e, h) 192 h and (c, f, i) 288 h

Fig.7 Surface micromorphologies of Q345q steel with oxide scale after corrosion for 480 h in (a) deicing salt, (b) NaHSO₃ and (c) deicing salt+NaHSO₃solutions

Fig.8 Cross-sectional morphologies of Q345q steel with oxide scale after corrosion in (a~c) deicing salt, (d~f) NaHSO₃ and (g~i) deicing salt+NaHSO₃ solutions for (a, d, g) 24 h, (b, e, h) 192 h and (c, f, i) 288 h

Fig.9 Partial cross-sectional morphologies magnified of Q345q steel with oxide scale after corrosion (a, b) in deicing salt and (c, d) mixed solutions for (a, c) 192 h and (b, d) 288 h

Fig.10 Cross-sectional morphologies of Q345q steel with oxide scale after corrosion for 480 h in (a) deicing salt, (b) NaHSO₃ and (c) deicing salt+NaHSO₃ solutions

Fig.11 Polarization curves of Q345q steel with oxide scale sample after corrosion for different time in (a) deicing salt, (b) NaHSO₃ and (c) deicing salt+ NaHSO₃

Table 4 Electrochemical parameters of Q345q steel with oxide scale after corrosion for different time in three solutions

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