Corrosion Behavior of Alumina-forming Austenitic Heat Resistant  Steel in Supercritical Carbon Dioxide

Ma Zhaodandan; Cong Shuo; Chen Yong; Guo Xianglong; Zhang Ruiqian; Liu Zhu; Zhang Xian

doi:10.13832/j.jnpe.2022.06.0101

Volume 43 Issue 6

Dec. 2022

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Article Navigation > Nuclear Power Engineering > 2022 > 43(6): 101-107

Ma Zhaodandan, Cong Shuo, Chen Yong, Guo Xianglong, Zhang Ruiqian, Liu Zhu, Zhang Xian. Corrosion Behavior of Alumina-forming Austenitic Heat Resistant Steel in Supercritical Carbon Dioxide[J]. Nuclear Power Engineering, 2022, 43(6): 101-107. doi: 10.13832/j.jnpe.2022.06.0101

Citation:

Ma Zhaodandan, Cong Shuo, Chen Yong, Guo Xianglong, Zhang Ruiqian, Liu Zhu, Zhang Xian. Corrosion Behavior of Alumina-forming Austenitic Heat Resistant Steel in Supercritical Carbon Dioxide[J]. Nuclear Power Engineering, 2022, 43(6): 101-107. doi: 10.13832/j.jnpe.2022.06.0101

Citation:

Ma Zhaodandan, Cong Shuo, Chen Yong, Guo Xianglong, Zhang Ruiqian, Liu Zhu, Zhang Xian. Corrosion Behavior of Alumina-forming Austenitic Heat Resistant Steel in Supercritical Carbon Dioxide[J]. Nuclear Power Engineering, 2022, 43(6): 101-107. doi: 10.13832/j.jnpe.2022.06.0101

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Corrosion Behavior of Alumina-forming Austenitic Heat Resistant Steel in Supercritical Carbon Dioxide

doi: 10.13832/j.jnpe.2022.06.0101

Ma Zhaodandan^{1, 2, 3
,},
Cong Shuo⁴,
Chen Yong^{2, 3
,
,},
Guo Xianglong⁴,
Zhang Ruiqian^{2, 3},
Liu Zhu⁴,
Zhang Xian^{1, 3}

1.
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China
2.
Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China
3.
Nuclear Power Institute of China, Chengdu, 610213, China
4.
Shanghai Jiao Tong University, Shanghai, 200240, China

Received Date: 2021-12-23
Rev Recd Date: 2022-03-11
Publish Date: 2022-12-14

Abstract

Abstract

The corrosion behavior of Alloy 20Cr-25Ni and a new structural material alumina-forming austenitic heat resistant steel (AFA steel) in supercritical carbon dioxide (S-CO₂) environment at 600℃/20 MPa was studied. The morphology, composition, and structure of oxide films of the two alloys were analyzed. It is found that the weight gain curves of the two alloys were in accord with the “parabola” law. The weight of corrosion products increased slowly; it was only 2.11 mg/dm² after 1000 h. By comparison, the coarse oxide products appeared on the surface of Alloy 20Cr-25Ni and increased with the extension of corrosion time, while oxide film of AFA steel remained dense and continuous. Through the analysis of the cross-sectional morphology of the oxide film, it is found that the Alloy 20Cr-25Ni has a two-layer oxide film structure after corrosion, which is mainly composed of Fe₃O₄ and FeCr₂O₄ oxide layer and a small amount of spinel. However, there are three layers of oxide film structure in AFA steel, the middle and inner layers are Cr₂O₃ and Al₂O₃ oxide films respectively, and the outer layer is distributed with a discontinuous FeCr₂O₄ spinel oxide. Due to the formation of dense Al₂O₃ oxide film, the corrosion resistance of AFA steel is greatly improved.

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References(14)

References

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