TY - JOUR
T1 - Short-term oxidation behavior of Cr-coated Zr-1Nb in severe accident environments
T2 - steam and air
AU - Geng, Donghui
AU - Deng, Jianxi
AU - Huo, Shangle
AU - Sun, Qiaoyan
AU - Song, Zhongxiao
AU - Li, Sigong
AU - Xue, Jiaxiang
AU - Liao, Yehong
AU - Sun, Jun
N1 - Publisher Copyright:
© The Author(s) 2025.
PY - 2025/12
Y1 - 2025/12
N2 - This study examines Cr-coated Zr-1Nb alloy cladding oxidation in steam/air (600–1200 °C), simulating accident scenarios. Thermogravimetry and static air tests revealed Cr coatings form granular oxides in air and coral/worm-like structures in steam (H2 release-driven). Cr3+ migration governs oxidation kinetics. At 1000 °C air (>40 min), weight gain deviates from parabolic kinetics due to ZrN/ZrO2 phase transitions, causing porous oxide formation. Air yields thinner Cr2O3 layers than steam at 800–1000 °C, as Cr2O3 reacts with O2 to form volatile CrO3. At 1200 °C air (>40 min), Cr2O3 thinning occurs due to dominant volatilization over diffusion. Results confirm Cr coatings delay Zr substrate oxidation during LOCAs by suppressing rapid degradation under extreme heat, enhancing accident tolerance. The balance between Cr2O3 thickening induced by diffusion and thinning induced by volatilization defines protective efficacy, validating the role of Cr in accident-tolerant fuel cladding.
AB - This study examines Cr-coated Zr-1Nb alloy cladding oxidation in steam/air (600–1200 °C), simulating accident scenarios. Thermogravimetry and static air tests revealed Cr coatings form granular oxides in air and coral/worm-like structures in steam (H2 release-driven). Cr3+ migration governs oxidation kinetics. At 1000 °C air (>40 min), weight gain deviates from parabolic kinetics due to ZrN/ZrO2 phase transitions, causing porous oxide formation. Air yields thinner Cr2O3 layers than steam at 800–1000 °C, as Cr2O3 reacts with O2 to form volatile CrO3. At 1200 °C air (>40 min), Cr2O3 thinning occurs due to dominant volatilization over diffusion. Results confirm Cr coatings delay Zr substrate oxidation during LOCAs by suppressing rapid degradation under extreme heat, enhancing accident tolerance. The balance between Cr2O3 thickening induced by diffusion and thinning induced by volatilization defines protective efficacy, validating the role of Cr in accident-tolerant fuel cladding.
UR - https://www.scopus.com/pages/publications/105006519695
U2 - 10.1038/s41529-025-00604-8
DO - 10.1038/s41529-025-00604-8
M3 - 文章
AN - SCOPUS:105006519695
SN - 2397-2106
VL - 9
JO - npj Materials Degradation
JF - npj Materials Degradation
IS - 1
M1 - 61
ER -