文献类型：期刊文献

英文题名：Effect of rare-earth particle doping on the corrosion performance of the AlCoCrFeNi coatings prepared by extremely high-speed laser cladding

作者：Zhang H.; Qiao M.; Yue X.-J.; Zhang P.; Sun W.; Ni X.; Wang W.; Yan X.; Zhang D.

机构：[1]Research Institute for Reliability Manufacturing of Intelligent High-End Equipment, Qilu Institute of Technology, Ji'nan, 250200, China;[2]School of Mechanical and Power Engineering, Guangdong Ocean University, Zhanjiang, 524088, China

年份：2026

卷号：1075

外文期刊名：Journal of Alloys and Compounds

收录：Scopus(收录号：2-s2.0-105042281950)

语种：英文

外文关键词：Electrochemical corrosion; Extreme high-speed laser cladding; High-entropy alloy coating; Microstructure; Rare-earth particle

外文摘要：In this study, four AlCoCrFeNi high-entropy alloy (HEA) coatings—S0 (undoped), S1 (CeO?-doped), S2 (Y?O?-doped), and S3 (CeO?+Y?O? co-doped)—were successfully fabricated on aluminum alloy substrates using extreme high-speed laser cladding (EHLC) technology, aiming to reveal the synergistic modification mechanism of rare-earth (RE) oxides under extreme non-equilibrium solidification conditions. Distinct from the near-equilibrium solidification process in conventional laser cladding, the ultra-rapid cooling nature of EHLC profoundly alters the behavior of RE particles within the molten pool: single doping (S1 or S2) provides merely limited heterogeneous nucleation sites during rapid solidification, exhibiting restricted efficacy in suppressing the FCC phase; conversely, driven by the extreme cooling rate, the CeO? + Y?O? co-doping (S3) generates a potent synergistic heterogeneous nucleation effect that is in-situ “frozen” during the ultra-high-speed solidification, leading to unprecedented, drastic grain refinement and lattice distortion within the microstructure. Electrochemical tests demonstrate that this unique microstructure, induced by the coupling between the ultra-rapid cooling kinetics of EHLC and the RE synergistic effect, endows the S3 coating with optimal corrosion resistance in a 3.5 wt% NaCl solution, characterized by a positive shift of the corrosion potential (Ecorr) to ?0.648 V, a decrease in the corrosion current density (Icorr) to 1.22 × 10?? A/cm2, and an increase in the polarization resistance (Rp) to 2989 Ω·cm2. This study reveals that the extreme cooling kinetics of EHLC not only significantly amplify the synergistic reinforcement effect of CeO? and Y?O? but also fundamentally optimize the electrochemical passivation mechanism of the coatings. These findings transcend the conventional understanding of traditional laser cladding processes, providing a robust theoretical foundation and technical reference for the design of novel surface engineering materials with high corrosion resistance under extreme service environments. ? 2026 Elsevier B.V.