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

被引：0
作者：
Ma Z. [1 ,2 ,3 ]
Cong S. [4 ]
Chen Y. [2 ,3 ]
Guo X. [2 ,3 ]
Zhang R.
Liu Z. [2 ,3 ]
Zhang X. [1 ,3 ]
机构：
[1] Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu
[2] Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu
[3] Nuclear Power Institute of China, Chengdu
[4] Shanghai Jiao Tong University, Shanghai
来源：
Hedongli Gongcheng/Nuclear Power Engineering | 2022年 / 43卷 / 06期
关键词：
Alumina-forming austenitic heat resistant steel (AFA steel); Aluminum oxide layer; Supercritical carbon dioxide (S-CO[!sub]2[!/sub]); Uniform corrosion;
D O I：
10.13832/j.jnpe.2022.06.0101
中图分类号：
学科分类号：
摘要：
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. © 2022 Yuan Zi Neng Chuban She. All rights reserved.
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页码：101 / 107
页数：6
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