Corrosion behavior of high strength weathering steel for concrete pole

Huang Yao; Zhu Binrong; Li Feng; Li Xingeng; Yan Fengjie

doi:10.7513/j.issn.1004-7638.2021.04.025

Volume 42 Issue 4

Aug. 2021

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Huang Yao, Zhu Binrong, Li Feng, Li Xingeng, Yan Fengjie. Corrosion behavior of high strength weathering steel for concrete pole[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(4): 149-155. doi: 10.7513/j.issn.1004-7638.2021.04.025

Citation:

Huang Yao, Zhu Binrong, Li Feng, Li Xingeng, Yan Fengjie. Corrosion behavior of high strength weathering steel for concrete pole[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(4): 149-155. doi: 10.7513/j.issn.1004-7638.2021.04.025

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Corrosion behavior of high strength weathering steel for concrete pole

doi: 10.7513/j.issn.1004-7638.2021.04.025

1.
China Electric Power Research Institute, Beijing 100192, China
2.
State Grid Corporation of China, Beijing 100031, China
3.
State Grid Corporation Joint Laboratory of Advanced Electrical Engineering Materials (Shandong), State Grid Shandong Electric Power Research Institute, Jinan 250001, Shangdong, China

Received Date: 2020-10-26
Publish Date: 2021-08-10

Abstract

Abstract

The corrosion behavior of two weathering steels, AYNH 420 and SQNH 420, was studied by using indoor accelerated corrosion tests, XRD analysis, and electrochemical methods. Weightlessness test was used to determine the corrosion rate of the two steels, and the corrosion kinetics of tow steels was studied. The micromorphology and structure of the corrosion products were characterized. Moreover, the corrosion mechanism of tested steels was studied by potentiodynamic polarization and AC impedance spectroscopy. The results indicate that under the same conditions, the corrosion rate of SQNH 420 is lower than that of AYNH 420. The compositions of corrosion products were Fe₃O₄, α-FeOOH, β-FeOOH and γ-FeOOH, etc. There are two layers in corrosion products, and the inner layer with good adhesion and compact structure plays a protective role. In addition, as the corrosion time increases, the corrosion products increase, and the corrosion tendency of two steels decreases, and the electrode reaction changes from electrode control to diffusion control.
- weathering steel,
- concrete pole,
- corrosion behavior,
- corrosion products,
- electrode reaction

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References(26)

References

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