Corrosion Behavior of Q690qE Steel in a Simulated Coastal-industrial Environment

doi:10.11902/1005.4537.2021.197

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (4): 669-674 DOI: 10.11902/1005.4537.2021.197

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Corrosion Behavior of Q690qE Steel in a Simulated Coastal-industrial Environment

FAN Yi¹, YANG Wenxiu¹, WANG Jun¹, CAI Jiaxing¹, MA Hongchi¹^,²(

)

^1.Nanjing Iron & Steel United Co. Ltd., Nanjing 210035, China
^2.National Materials Corrosion and Protection Data Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

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Abstract

Corrosion behavior of high-strength Q690qE bridge steel was investigated by means of immersion-drying cyclical corrosion test (CCT) method coupled with characterization of the morphology and composition of rust, cross sectional morphology of the corroded steels and corrosion depth measurement. The results revealed that a compact rust layer can easily form in this simulated humid coastal-industrial environment, and which presents certain protection ability for the steel substrate. However, there was no enrichment of Ni/Cr and other alloy elements in the rust. Besides, there was apparent concentration of Cl^- and FeSO₄ underneath the rust layer, which may contribute to the high corrosion rate and evident corrosion pits on the steel surface. The results of power exponent fitting display that the corrosion depth (mm) and time (d) exhibits a well power function of D=0.019·t^0.7.

Key words: Q690qE bridge steel coastal-industrial environment high-strength weathering steel atmospheric corrosion

Received: 13 August 2021

ZTFLH:

TG172.3

Fund: National Science and Technology Resources Investigation Program of China(2019FY101400);Fundamental Research Funds for the Central Universities(FRF-BD-20-26A)

Corresponding Authors: MA Hongchi E-mail: mahongchi@ustb.edu.cn

About author: MA Hongchi, E-mail: mahongchi@ustb.edu.cn

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Cite this article:

FAN Yi, YANG Wenxiu, WANG Jun, CAI Jiaxing, MA Hongchi. Corrosion Behavior of Q690qE Steel in a Simulated Coastal-industrial Environment. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 669-674.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.197 OR https://www.jcscp.org/EN/Y2022/V42/I4/669

Fig.1 OM (a) and SEM (b) microstructure of Q690qE steel

Fig.2 Original morphology (a) and morphologies of the rust layer on Q690qE steel afte 10 d (b), 25 d (c) and 40 d (d) of cyclic corrosion test

Fig.3 SEM morphologies of rust layer on Q690qE steel after 10 d (a), 25 d (b) and 40 d (c) of cyclic corrosion test

Fig.4 Cross-sectional images of the rust layer of Q690qE steel after 10 d (a), 25 d (b) and 40 d (c) of cyclic corrosion test

Fig.5 Cross-sectional element distribution of Q690qE steel after 10 d (a), 25 d (b) and 40 d (c) of cyclic corrosion test

Fig.6 Optical images of Q690qE steel substrate after different time of CCT

Fig.7 Corrosion morphologies of Q690qE steel afte 10 d (a), 25 d (b) and 40 d (c) of cyclic corrosion test

Fig.8 Corrosion depth of Q690qE steel of cyclic corrosion test with corrosion time

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