Study on the corrosion behavior of a 600 MPa corrosion-resistant steel barin a chloride environment

Li Pei; Yuan Jing; Huang Jixiang; Yan Bo; Yin Shubiao; Lei Ting

doi:10.7513/j.issn.1004-7638.2023.03.019

Volume 44 Issue 3

Jun. 2023

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Li Pei, Yuan Jing, Huang Jixiang, Yan Bo, Yin Shubiao, Lei Ting. Study on the corrosion behavior of a 600 MPa corrosion-resistant steel barin a chloride environment[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(3): 123-130. doi: 10.7513/j.issn.1004-7638.2023.03.019

Citation:

Li Pei, Yuan Jing, Huang Jixiang, Yan Bo, Yin Shubiao, Lei Ting. Study on the corrosion behavior of a 600 MPa corrosion-resistant steel barin a chloride environment[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(3): 123-130. doi: 10.7513/j.issn.1004-7638.2023.03.019

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Study on the corrosion behavior of a 600 MPa corrosion-resistant steel barin a chloride environment

doi: 10.7513/j.issn.1004-7638.2023.03.019

1.
School of Material and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2.
Xinyu Iron and Steel Group Co. , Ltd., Xinyu 338001, Jiangxi, China
3.
Kunming Metallurgy College, Kunming 650033, Yunnan, China

Received Date: 2022-12-23
Publish Date: 2023-06-30

Abstract

Abstract

The effect of Cr and V elements on the corrosion behavior of the ordinary 600 MPa grade high-strength seismic steel bar HRB600E and the same grade corrosion-resistant steel bar after alloy regulation was studied by the cyclic immersion tests, electrochemical tests, surface analysis, and phase analysis in a chloride environment. The results show that the addition of corrosion-resistant alloy promotes the formation of bainite in the matrix and slows down the corrosion process of the ferrite anode. The synergistic effect of V and Cr elements can hinder the infiltration of Cl⁻, effectively delaying the growth rate of the rust layer, and the corrosion rate of corrosion-resistant steel bars decreases after 360 hours of cyclic immersion. Under the control of Cr-V elements, the self-corrosion potential of the electrochemical properties of corrosion-resistant steel bars increases, while the potential shifts positively after passivation, and the corrosion current density decreases. The AC impedance value of the corrosion-resistant steel bar is significantly improved after passivation, and it shows excellent corrosion resistance in the alkaline environment of concrete. The regulation of alloying elements improves the phase composition of corrosion products of the steel bars. The proportion of α-FeOOH and γ-FeOOH in the later corrosion products of the corrosion-resistant steel bars is higher and the internal rust layer is enriched with spinel-structured product FeCr₂O₄, which increases the density and stability of the internal rust layer.
- 600 MPa corrosion resistant rebar,
- corrosion behavior,
- corrosion resistance,
- chloride ion corrosion,
- Cr-V system

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References

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