Corrosion behaviors of pre-oxidized Al-containing Fe alloys in molten NaCl–KCl salts

作者：Taehoon Park, Wonseok Lee, Sumin Kim, Hyun Joon Eom, Wonseok Yang, Richard I. Foster, Chaewon Kim, Sungyeol Choi, Changheui Jang · 发表于：Journal of Materials Research and Technology · 年份：2025 · DOI：10.1016/j.jmrt.2025.04.207 · 被引用次数：6 · 研究领域：Molten salt chemistry and electrochemical processes、Nuclear materials and radiation effects、Thermodynamic and Structural Properties of Metals and Alloys

The effect of pre-oxidation on the corrosion resistance of two Fe-based high-Al alloys, named Advanced Creep resistance Enhanced Stainless steel (ACES) and Alumina-forming Duplex Stainless Steel (ADSS), in molten NaCl–KCl salts at 750 °C for 500 h has been studied. Corrosion behavior of the alloys was evaluated through weight loss, electron microscopy, X-ray analysis, and elemental analysis. The results show that pre-oxidized ACES formed a stable aluminum oxide layer, which provided enhanced corrosion resistance. In contrast, pre-oxidized ADSS experienced significant oxide layer degradation and higher weight loss than those without pre-oxidation. This contrasting performance is attributed to the selective dissolution of alloying elements such as Cr and Mn, which influenced the integrity of the oxide scales.