Acta Metallurgica Sinica (English Letters) ›› 2025, Vol. 38 ›› Issue (4): 672-690.DOI: 10.1007/s40195-025-01818-0

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Effect of CeO2 on the H2O/NaCl-Induced Corrosion Behavior of Ni-Co Coating at 650 °C

Yifei Gao1, Peng Zhang1,2, Pan Ren1,2, Yingfei Yang1,2,3(), Guofeng Han4, Wenbo Du4, Wei Li1, Qiwei Wang1,2()   

  1. 1Institute of Advanced Wear & Corrosion Resistant and Functional Material, Jinan University, Guangzhou 510632, China
    2Guangdong Provincial Engineering & Technology Research Center for Corrosion Resistant Materials, Wear and Corrosion Resistant Technology, Guangzhou 510632, China
    3Shaoguan Research Institute of Jinan University, Shaoguan 512029, China
    4Army Academy of Armored Forces, Beijing 100072, China
  • Received:2024-08-12 Revised:2024-10-06 Accepted:2024-11-11 Online:2025-04-10 Published:2025-02-18
  • Contact: Yingfei Yang, yfyang@jnu.edu.cn; Qiwei Wang, wangqiwei@jnu.edu.cn

Abstract:

The corrosion behavior of Ni-Co-CeO2 composite coating was investigated under a simulated high-temperature marine atmosphere alongside Ni-Co coating. The corrosion kinetics, phase composition and microstructure evolution of the coatings were analyzed. A multi-layered oxide scale formed due to the synergistic corrosion by H2O and NaCl. The growth mechanism of the Co3O4, Fe3O4, Fe2O3, CoFe2O4, NiFe2O4 and NiO in the scale was proposed according to the distribution of the CeO2 particles. Compared to Ni-Co cating, the Ni-Co-CeO2 coating exhibited superior corrosion resistance in the H2O/NaCl steam, which is beacause the CeO2 exerted a blocking effect on retarding the diffusion of Fe atoms and corrosive medium, contributing to a reduced corrosion rate and an improved oxide adhesion compared to Ni-Co coating.

Key words: H2O/NaCl-induced corrosion, Composite coatings, Transmission electron microscopy (TEM), Corrosion mechanism