TY - JOUR
T1 - Degradation mechanism of oxide film on SIMP steel in LBE at temperatures above 550 °C
AU - Liu, Tao
AU - Yang, Chongdou
AU - Fan, Xiangrong
AU - Yun, Di
AU - Liu, Wenguan
AU - Popovic, Miroslav
AU - Zhao, Bingyao
AU - Xia, Haiqing
AU - Liu, Zhongbo
AU - Qiu, Jie
N1 - Publisher Copyright:
© 2026 Korean Nuclear Society, Published by Elsevier Korea LLC. All rights are reserved, including those for text and data mining, AI training, and similar technologies. This is an open access article under the CC BY-NC-ND license. http://creativecommons.org/licenses/by-nc-nd/4.0/
PY - 2026/5
Y1 - 2026/5
N2 - The corrosion behavior of SIMP steel in liquid lead-bismuth eutectic was investigated to elucidate the degradation mechanism of Fe-based protective oxide film in LBE when the temperature exceeds the critical threshold of 550 °C. Results show that a three-layer oxide film structure is formed on the surface of SIMP steel, consisting of an outer oxidation layer of Fe3O4, an inner oxidation layer of Fe-Cr spinel, and an internal oxidation zone. At 550 °C, SIMP steel forms a stable oxide layer and exhibits excellent resistance to LBE corrosion. However, at 600 °C, the increased diffusion coefficients of elements and their higher solubility in LBE accelerate elemental depletion, leading to the dissolution of the outer oxidation layer. The formation of a Cr2O3 band protects the matrix but also impedes elements diffusion from matrix to the oxides, promoting the formation of nanoscale voids and pores in the inner oxidation layer, resulting the failure of oxide film to resist lead-bismuth eutectic corrosion at 600 °C. The failure of the inner oxidation layer further accelerates the corrosion of the matrix.
AB - The corrosion behavior of SIMP steel in liquid lead-bismuth eutectic was investigated to elucidate the degradation mechanism of Fe-based protective oxide film in LBE when the temperature exceeds the critical threshold of 550 °C. Results show that a three-layer oxide film structure is formed on the surface of SIMP steel, consisting of an outer oxidation layer of Fe3O4, an inner oxidation layer of Fe-Cr spinel, and an internal oxidation zone. At 550 °C, SIMP steel forms a stable oxide layer and exhibits excellent resistance to LBE corrosion. However, at 600 °C, the increased diffusion coefficients of elements and their higher solubility in LBE accelerate elemental depletion, leading to the dissolution of the outer oxidation layer. The formation of a Cr2O3 band protects the matrix but also impedes elements diffusion from matrix to the oxides, promoting the formation of nanoscale voids and pores in the inner oxidation layer, resulting the failure of oxide film to resist lead-bismuth eutectic corrosion at 600 °C. The failure of the inner oxidation layer further accelerates the corrosion of the matrix.
KW - Corrosion
KW - Lead-bismuth eutectic
KW - Oxide film
KW - SIMP steel
UR - https://www.scopus.com/pages/publications/105035299681
U2 - 10.1016/j.net.2026.104131
DO - 10.1016/j.net.2026.104131
M3 - 文章
AN - SCOPUS:105035299681
SN - 1738-5733
VL - 58
JO - Nuclear Engineering and Technology
JF - Nuclear Engineering and Technology
IS - 5
M1 - 104131
ER -