中国电机工程学报2025，Vol.45Issue(14)：5358-5368,中插2,12.DOI:10.13334/j.0258-8013.pcsee.241466
工质纯度对超临界CO2下材料腐蚀行为影响规律
Working Fluid Purity Influence of Materials Corrosion Behavior Under Supercritical CO2
摘要
Abstract
Supercritical carbon dioxide(S-CO2)has gained widespread attention in academia due to its unique critical pressure and temperature.The corrosion resistance of high-temperature materials remains a primary limiting factor affecting the efficiency of power generation units,necessitating that heat-resistant steels meet the safety requirements of power generation equipment.This paper selects three types of high-temperature materials:ferritic heat-resistant steel T91,austenitic stainless steel 304,and nickel-based superalloy 617,and investigates their corrosion behavior after 500 hours in a research-grade and industrial-grade S-CO2 environment at 600℃ and 15 MPa.The corrosion products are characterized using corrosion kinetic weight gain curves,scanning electron microscopy(SEM),energy-dispersive X-ray spectroscopy(EDS),X-ray diffraction(XRD),and Raman spectroscopy.The results indicate that the weight gain due to corrosion for T91 and 304 in an industrial-grade S-CO2 environment is higher than that in a research-grade S-CO2 environment.The dual-layer oxide film of T91 consists of an outer layer of Fe3O4 and an inner layer of(Fe,Cr)3O4.In industrial-grade S-CO2 corrosion,Fe2O3 appears in the oxide film.The oxide films of 304 and 617 consist of a single layer of Cr2O3 oxide,effectively preventing corrosion by impurity gases and carburization reactions.Consequently,the difference in corrosion behavior between research-grade and industrial-grade S-CO2 is minimal for 304 and 617.The findings of this study offer valuable insights for material selection and subsequent corrosion prevention in S-CO2 power generation systems.关键词
超临界二氧化碳/铁素体耐热钢/奥氏体不锈钢/镍基高温合金Key words
supercritical carbon dioxide/ferritic heat-resistant steel/austenitic heat-resistant steel/nickel-based high-temperature alloy/high-temperature corrosion/carburization behavior分类
矿业与冶金引用本文复制引用
何闯,梁志远,郭亭山,邵怀爽,赵钦新..工质纯度对超临界CO2下材料腐蚀行为影响规律[J].中国电机工程学报,2025,45(14):5358-5368,中插2,12.基金项目
国家自然科学基金项目(52276015). Project Supported by National Natural Science Foundation of China(52276015). （52276015）
