Comparison of the corrosion behavior of four Fe-Cr-Ni austenitic alloys in supercritical water

被引：2

作者：

Huang, Tao ^{[1
]}

Su, Haozhan ^{[2
]}

Zhou, Yuhao ^{[1
]}

Wang, Jiamei ^{[1
]}

Zhang, Lefu ^{[1
]}

Chen, Kai ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai 200240, Peoples R China

[2] China Inst Atom Energy, Beijing 102413, Peoples R China

来源：

JOURNAL OF NUCLEAR MATERIALS | 2025年 / 603卷

关键词：

Austenitic alloys; Surface condition; Corrosion; Supercritical water; METAL LATTICE VACANCIES; 316L STAINLESS-STEEL; OXIDATION; RESISTANCE; DIFFUSION; OXYGEN; NICKEL; IRON;

D O I：

10.1016/j.jnucmat.2024.155409

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The corrosion behavior of four Fe-Cr-Ni austenitic alloys were investigated after exposure to deaerated supercritical water (SCW) at 650 degrees C. Results show that the corrosion resistance follows the trend:Fe-29Cr-61Ni > Fe-16Cr-75Ni > Fe-25Cr-20Ni > Fe-21Cr-31Ni. The increase in Cr and Ni contents promote a transition from low-protective multilayer oxide scales to protective Cr2O3 scales. After surface grinding, the weight gains of all specimens dropped by one order of magnitude. Surface grinding induces the formation of ultrafine grains and a high density of dislocations, which enhances the corrosion resistance among all studied austenitic alloys. However, the beneficial effects of grinding diminish with increased Cr and Ni contents due to the pre-existing portion of Cr2O3 scales. The lower critical Cr content required to form Cr2O3 scales in high Ni austenitic alloys is primarily attributed to their lower solubility of O and the slower diffusion rates of Ni, which inhibit corrosion behavior.

引用

页数：11

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