Study on Corrosion Behavior of High-corrosion Resistance AFAs in Supercritical Water

Gao Yang; Guo Xianglong; Jiang Yufan; Wu Jianwen; Tang Rui; Huang Yanping; Zhang Lefu

doi:10.13832/j.jnpe.2024.06.0271

Volume 45 Issue 6

Dec. 2024

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Article Navigation > Nuclear Power Engineering > 2024 > 45(6): 271-279

Gao Yang, Guo Xianglong, Jiang Yufan, Wu Jianwen, Tang Rui, Huang Yanping, Zhang Lefu. Study on Corrosion Behavior of High-corrosion Resistance AFAs in Supercritical Water[J]. Nuclear Power Engineering, 2024, 45(6): 271-279. doi: 10.13832/j.jnpe.2024.06.0271

Citation:

Gao Yang, Guo Xianglong, Jiang Yufan, Wu Jianwen, Tang Rui, Huang Yanping, Zhang Lefu. Study on Corrosion Behavior of High-corrosion Resistance AFAs in Supercritical Water[J]. Nuclear Power Engineering, 2024, 45(6): 271-279. doi: 10.13832/j.jnpe.2024.06.0271

Citation:

Gao Yang, Guo Xianglong, Jiang Yufan, Wu Jianwen, Tang Rui, Huang Yanping, Zhang Lefu. Study on Corrosion Behavior of High-corrosion Resistance AFAs in Supercritical Water[J]. Nuclear Power Engineering, 2024, 45(6): 271-279. doi: 10.13832/j.jnpe.2024.06.0271

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Study on Corrosion Behavior of High-corrosion Resistance AFAs in Supercritical Water

doi: 10.13832/j.jnpe.2024.06.0271

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

Received Date: 2024-06-23
Rev Recd Date: 2024-08-26
Publish Date: 2024-12-17

Abstract

Abstract

To address the inapplicability of traditional stainless steel in the high-temperature, high-pressure and highly corrosive service conditions of supercritical-water cooled reactor core, a novel alumina-forming austenitic stainless steels (AFAs) was designed and prepared, and its corrosion behavior in supercritical water at 600℃/25 MPa was studied by autoclave immersion test. The morphology, composition and structural characteristics of the oxide scale on the surface of AFAs after corrosion in supercritical water were studied by using a variety of advanced micro-analysis techniques to explore the corrosion resistance mechanism of the alloy in supercritical water and the scale-forming behavior of alumina. The results show that the AFAs offered excellent corrosion resistance by forming a continuous alumina scale in supercritical-water at 600℃, with a corrosion weight gain of less than 10 mg/dm² after 1000 h of exposure, which is better than that of C276 and 310-ODS alloys corroded under the same conditions reported in the literature. The alumina scale is densely and tightly combined with the alloy matrix without obvious separations, effectively hindering the direct contact between the oxidizing media and the alloy matrix, and inhibiting the external diffusion of Fe in the alloy, thus providing excellent protection for the alloy. However, the Laves in the AFAs can affect the uniformity of the localized alumina scale, leading to the formation of MnCr₂O₄ particles. Therefore, AFAs need to maintain continuous formation of alumina scale while strictly controlling the Laves phase level to satisfy the requirements of supercritical water-cooled reactor applications. The results of this paper can provide data and theoretical support for the development and design of aluminum-forming austenitic stainless steels for supercritical water-cooled reactors.
- Supercritical water-cooled reactor (SCWR),
- Alumina-forming austenitic stainless steels (AFAs),
- General corrosion,
- Alumina scale,
- Laves

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References(20)

References

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