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金属学报  2024, Vol. 60 Issue (6): 731-742    DOI: 10.11900/0412.1961.2023.00498
  综述 本期目录 | 过刊浏览 |
Ni-Cr合金在富CO2 气氛中的高温腐蚀研究进展
谢云1(), Zhang Jianqiang2, 彭晓1
1 南昌航空大学 材料科学与工程学院 南昌 330063
2 School of Materials Science and Engineering, University of New South Wales, Sydney 2052, Australia
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
引用本文:

谢云, Zhang Jianqiang, 彭晓. Ni-Cr合金在富CO2 气氛中的高温腐蚀研究进展[J]. 金属学报, 2024, 60(6): 731-742.
Yun XIE, Jianqiang Zhang, Xiao PENG. Research Advances in High Temperature Corrosion of Ni-Cr Alloys in CO2-Rich Environments[J]. Acta Metall Sin, 2024, 60(6): 731-742.

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摘要: 

发展富氧燃烧技术和提高锅炉的蒸汽参数可以有效减少燃煤电厂的CO2排放,有助于火力发电行业实现“碳达峰-碳中和”的目标,但采用上述技术对锅炉材料的抗CO2高温腐蚀性能和高温蠕变强度提出了更高要求,镍基合金有望成为优选材料。针对先进超超临界发电机组富氧燃烧烟气高含CO2的特点,本文综述了目前关于Ni-Cr合金在富CO2气氛中的高温腐蚀研究成果,重点介绍了CO2气氛对Ni-Cr合金热生长Cr2O3保护膜的影响,阐明了Ni-Cr合金在CO2气氛中发生碳化的机理,总结了富CO2气氛中的H2O(g)、SO2、环境温度和合金元素对Ni-Cr合金抗高温腐蚀性能的影响,进而提出未来关于Ni-Cr合金在富CO2气氛中的高温腐蚀需深入研究的问题,包括:解析Ni-Cr合金在不同气氛中热生长Cr2O3膜的微观精细结构,探明CO2、H2O(g)和SO2与稀土元素在氧化膜晶界处的交互作用,关注富CO2气氛中的HCl(g)组分对Ni-Cr合金形成Cr2O3保护膜的影响。

关键词 Ni-Cr合金富CO2气氛高温腐蚀    
Abstract

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.

Key wordsNi-Cr alloy    CO2-rich environment    high temperature corrosion
收稿日期: 2023-12-27     
ZTFLH:  TG172.8  
基金资助:国家自然科学基金项目(52301089);江西省重点研发计划项目(20232BBE50007);江西省自然科学基金项目(20224BAB214018)
通讯作者: 谢 云,yun.xie@nchu.edu.cn,主要从事金属材料高温腐蚀的研究;
Corresponding author: XIE Yun, associate professor, Tel: 15827996962, E-mail: yun.xie@nchu.edu.cn
作者简介: 谢 云,男,1988年生,副教授,博士
图1  Ni-30Cr合金在650℃下Ar + 20O2和Ar + 20CO2 (体积分数,%)气氛中腐蚀310 h后的截面SEM像[36,37]
图2  Ni-25Cr和Ni-30Cr合金在700℃下Ar + 20CO2气氛中腐蚀500 h后晶界碳化物的SEM像[37]
图3  Fe-20Cr合金先后在650℃下Ar + 20O2和Ar + 20CO2气氛中腐蚀所形成Cr2O3膜的三维原子探针像[60]
图4  Ni-15Cr合金和纯Ni在650℃下Ar + 20CO2和Ar + 20CO2 + 20H2O气氛中腐蚀后的截面SEM像[42]
图5  Ni-30Cr合金在800℃下Ar + 20CO2 + 20H2O和Ar + 20CO2气氛中腐蚀500 h后的截面SEM像和TEM像[75]
T / oCD˜Cr / (cm2·s-1)NCr(1)NCr(2)
6502.6 × 10-150.31> 0.68
7001.4 × 10-140.280.39
8002.3 × 10-130.240.16
  
图6  Ni-25Cr合金在不同温度下Ar + 20CO2气氛中腐蚀500 h后的截面SEM像[37]
图7  Ni-30Cr-2Ti合金在700℃下Ar + 20CO2 + 20H2O气氛中腐蚀不同时间后的碳化物SEM像[73]
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