Research Advances in High Temperature Corrosion of Ni-Cr Alloys in CO2-Rich Environments
XIE Yun1(), Zhang Jianqiang2, PENG Xiao1
1 School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China 2 School of Materials Science and Engineering, University of New South Wales, Sydney 2052, Australia
Cite this article:
XIE Yun, Zhang Jianqiang, PENG Xiao. Research Advances in High Temperature Corrosion of Ni-Cr Alloys in CO2-Rich Environments. Acta Metall Sin, 2024, 60(6): 731-742.
The thermal power generation industry in China is facing heavy pressure from environmental protection sectors as the “emission peak-carbon neutrality” goal has been proposed. Oxyfuel combustion and operating with high steam parameters are considered promising technologies that can effectively reduce CO2 emissions from coal-fired power plants. However, using these two technologies, the currently used ferritic/martensitic heat-resistant steels and austenitic stainless steels in traditional boilers cannot meet the requirements of good creep strength and corrosion resistance to hot CO2-rich gasses. Thus, nickel-based alloys must be considered. Given that flue gasses related to oxyfuel combustion are characterized by high CO2 concentrations, this work reviews recent research progress on the high-temperature corrosion of Ni-Cr alloys in CO2-rich gasses. Herein, the effect of CO2 on protective Cr2O3 scale formation is introduced, and the related carburization mechanism caused by CO2 ingress is clarified. Moreover, the impacts of H2O(g), SO2, temperature, and alloying elements on the high temperature resistance of Ni-Cr alloys in CO2-rich gasses are summarized. Based on the current findings, future research on high-temperature corrosion of Ni-Cr alloys in CO2-rich gases should focus on the following key points, such as analyzing the microstructure of Cr2O3 scales formed in different gasses; elucidating the interaction of CO2, H2O(g), and SO2 molecules with rare earth elements at grain boundaries of oxide scales; and investigating the effect of HCl(g) impurities in CO2-rich gasses on Cr2O3 scaling of Ni-Cr alloys.
Fund: National Natural Science Foundation of China(52301089);Jiangxi Provincial Key Research and Development Program(20232BBE50007);Jiangxi Provincial Natural Science Foundation(20224BAB214018)
Corresponding Authors:
XIE Yun, associate professor, Tel: 15827996962, E-mail: yun.xie@nchu.edu.cn
Fig.1 Cross-sectional SEM images of Ni-30Cr exposed at 650oC for 310 h in Ar + 20O2 (a)[36] and Ar + 20CO2 (b)[37] atmospheres (volume fraction, %)
Fig.2 SEM images of carbides precipitated along the grain boundaries in Ni-25Cr (a) and Ni-30Cr (b) exposed at 700oC for 500 h in Ar + 20CO2 atmosphere[37]
Fig.3 Atom probe tomography (APT) images of Cr2O3 scale grown on Fe-20Cr exposed at 650oC in Ar + 20O2 and subsequently in Ar + 20CO2[60]
Fig.4 Cross-sectional SEM images of Ni-15Cr alloy exposed at 650oC for 310 h in Ar + 20CO2 (a) and Ar + 20CO2 + 20H2O(b), and pure Ni exposed at 650oC for 150 h in Ar + 20CO2 (c) and Ar + 20CO2 + 20H2O (d)[42]
Fig.5 Cross-sectional SEM images of Ni-30Cr alloy exposed at 800oC for 500 h in Ar + 20CO2 + 20H2O (a) and Ar + 20CO2 (b), and cross-sectional BF-TEM images of corresponding scales formed in Ar + 20CO2 + 20H2O (c, d) and Ar + 20CO2 (e) (Fig.5c is the magnified image at the scale-alloy interface formed in Ar + 20CO2 + 20H2O)[75]
T / oC
/ (cm2·s-1)
650
2.6 × 10-15
0.31
> 0.68
700
1.4 × 10-14
0.28
0.39
800
2.3 × 10-13
0.24
0.16
Table 1 Values of , , and of Ni-Cr alloys corroded in Ar + 20CO2 at different temperatures[36,37,75]
Fig.6 Cross-sectional SEM images of Ni-25Cr alloy exposed at 650oC (a), 700oC (b), and 800oC (c) for 500 h in Ar + 20CO2[37]
Fig.7 SEM images of carbide precipitates in Ni-30Cr-2Ti alloy exposed at 700oC for 20 h (a) and 500 h (b) in Ar + 20CO2 + 20H2O[73]
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