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<p>Supercritical carbon dioxide (S-CO<sub>2</sub>) power cycles have emerged as a promising technology for next-generation energy systems due to their high thermal efficiency and compact system design. However, the extreme operating conditions (typically &gt; 550&#xa0;°C and 15–32&#xa0;MPa) pose significant challenges for the structural materials in these energy systems, primarily due to the high-temperature corrosion. This review provides a comprehensive overview of the corrosion behaviors of structural materials in S-CO<sub>2</sub> environments, with a particular focus on the key factors influencing the degradation behaviors. Corrosion mechanisms, including oxidation, carburization and their synergistic interactions, are analyzed in relation to operating temperature and pressure, second phase characteristics and environmental impurities such as H<sub>2</sub>O, O<sub>2</sub>, and SO<sub>2</sub>. Special attention is given to the role of second phases (carbides, oxides and intermetallic compounds) in governing microstructural stability and corrosion resistance in high-temperature S-CO<sub>2</sub> environments. In addition, future research directions are proposed, emphasizing the importance of advanced characterization, multi-impurity modeling and second-phase engineering strategies. This work aims to inform the design of advanced structural materials and environmental control strategies for high-temperature S-CO<sub>2</sub> energy systems.</p>

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High-temperature corrosion behavior of structural materials in supercritical carbon dioxide

  • 期刊论文

  • 发表日期：

    2025年12月7日

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  • Chuangjie Fang,
  • Yichen Zhang,
  • Wei Liao,
  • Xuesong Leng,
  • Hongsheng Chen

摘要

Supercritical carbon dioxide (S-CO2) power cycles have emerged as a promising technology for next-generation energy systems due to their high thermal efficiency and compact system design. However, the extreme operating conditions (typically > 550 °C and 15–32 MPa) pose significant challenges for the structural materials in these energy systems, primarily due to the high-temperature corrosion. This review provides a comprehensive overview of the corrosion behaviors of structural materials in S-CO2 environments, with a particular focus on the key factors influencing the degradation behaviors. Corrosion mechanisms, including oxidation, carburization and their synergistic interactions, are analyzed in relation to operating temperature and pressure, second phase characteristics and environmental impurities such as H2O, O2, and SO2. Special attention is given to the role of second phases (carbides, oxides and intermetallic compounds) in governing microstructural stability and corrosion resistance in high-temperature S-CO2 environments. In addition, future research directions are proposed, emphasizing the importance of advanced characterization, multi-impurity modeling and second-phase engineering strategies. This work aims to inform the design of advanced structural materials and environmental control strategies for high-temperature S-CO2 energy systems.