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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·t0.7.
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Received: 13 August 2021
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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
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About author: MA Hongchi, E-mail: mahongchi@ustb.edu.cn
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