Corrosion Behavior Study of Fe-22Cr-25Ni Austenitic Heat-Resistant Steel under Supercritical CO<sub>2</sub> Condition

Guo Tingshan; Liang Zhiyuan; Gui Yong; Zhao Qinxin

doi:10.13832/j.jnpe.2021.06.0093

Volume 42 Issue 6

Dec. 2021

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Guo Tingshan, Liang Zhiyuan, Gui Yong, Zhao Qinxin. Corrosion Behavior Study of Fe-22Cr-25Ni Austenitic Heat-Resistant Steel under Supercritical CO2 Condition[J]. Nuclear Power Engineering, 2021, 42(6): 93-99. doi: 10.13832/j.jnpe.2021.06.0093

Citation:

Guo Tingshan, Liang Zhiyuan, Gui Yong, Zhao Qinxin. Corrosion Behavior Study of Fe-22Cr-25Ni Austenitic Heat-Resistant Steel under Supercritical CO₂ Condition[J]. Nuclear Power Engineering, 2021, 42(6): 93-99. doi: 10.13832/j.jnpe.2021.06.0093

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Corrosion Behavior Study of Fe-22Cr-25Ni Austenitic Heat-Resistant Steel under Supercritical CO₂ Condition

doi: 10.13832/j.jnpe.2021.06.0093

MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

Received Date: 2020-10-09
Rev Recd Date: 2021-04-01
Publish Date: 2021-12-09

Abstract

Abstract

The high temperature corrosion behavior of austenitic heat-resistant steel Fe-22Cr-25Ni under 600℃/700℃ and 15 MPa supercritical CO₂ condition was investigated. The composition, content and element distribution of corrosion products were characterized by Raman spectroscopy, Glow Discharge Spectroscopy, SEM and EDS. The results show that the corrosion kinetics of Fe-22Cr-25Ni at 600℃/700℃ follow the parabola-like law, and the change of corrosion mass gain increases with increasing temperature. By observing the characterization results and thermodynamic calculations, it is concluded that the corrosion product composition is mainly Cr₂O_3, specifically, from the gas side to the substrate side are the outermost Mn oxide, the internal Cr₂O₃ and Mn-Cr oxide, the SiO₂ layer at the oxide layer / substrate interface, and the carbide and internal oxide in the substrate; C is mainly deposited on the surface of corrosion products, the width and depth of the Cr-depleted zone increase with increasing time. At the same time, according to the mass ratio of O and C and the results of thermodynamic calculation, it is suggested that C is very likely to be diffused in ionic state.
- Supercritical CO₂,
- Corrosion behavior,
- Austenitic heat-resistant steel,
- Fe-22Cr-25Ni

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References(20)

References

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