Study of the heating rate effect on the oxidation kinetics of the corrosion-resistant rebar

Wang Baoshan; Zhang Hongliang; Ma Jian; Feng Guanghong

doi:10.7513/j.issn.1004-7638.2023.03.025

Volume 44 Issue 3

Jun. 2023

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Wang Baoshan, Zhang Hongliang, Ma Jian, Feng Guanghong. Study of the heating rate effect on the oxidation kinetics of the corrosion-resistant rebar[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(3): 165-170. doi: 10.7513/j.issn.1004-7638.2023.03.025

Citation:

Wang Baoshan, Zhang Hongliang, Ma Jian, Feng Guanghong. Study of the heating rate effect on the oxidation kinetics of the corrosion-resistant rebar[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(3): 165-170. doi: 10.7513/j.issn.1004-7638.2023.03.025

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Study of the heating rate effect on the oxidation kinetics of the corrosion-resistant rebar

doi: 10.7513/j.issn.1004-7638.2023.03.025

Metallurgical Technology Institute, Central Iron and Steel Research Institute, Beijing 100081, China

Received Date: 2022-10-18
Publish Date: 2023-06-30

Abstract

Abstract

The oxidation behavior of corrosion-resistant rebar at various heating rates in air was studied by thermogravimetric analysis and microstructural observation, and the results were compared with those of isothermal oxidation. It is showed that there were no significant microstructural differences at different heating rates, but the oxidation thickness increased with the decrement of the heating rate. Meanwhile, the oxide scale displayed a two-layer structure when the heating rates were under 10 ℃/min, but there was almost a single layer of the oxide at the heating rate of 20 ℃/min. A new calculation method for the oxidising activation energy was established through the constant heating rate tests. The relative errors of the heat rates of 5, 10 ℃/min, and 20 ℃/min were 4.14%, 5.12%, and 32.13% respectively, compared to the values obtained by the isothermal oxidation tests. Thus, in order to ensure the accuracy of the new method, tests should be carried out at comparatively low heating rates.
- corrosion-resistant rebar,
- oxidation kinetics,
- heating rate,
- oxidising activation energy,
- isothermal oxidation

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References

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