J. Mater. Sci. Technol. ›› 2024, Vol. 201: 222-235.DOI: 10.1016/j.jmst.2024.02.079

• Research Article • Previous Articles     Next Articles

Enhancing the high-temperature corrosion resistance of HVOF-sprayed NiCoCrAlY coating in marine environment by Pt modification and pre-oxidation

Y.Y. Lia,b, Y.M. Jianga,b, C. Zhangc, H.Z. Jic, S. Lib, N. Xua,b, Z.B. Baoa,b,*, S.L. Zhua,b, F.H. Wangd   

  1. aSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;
    bShi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    cNational Engineering Research Center of Special Equipment and Power System for Ship and Marine Engineering, No.703 Research Institute of CSSC, Harbin 150078, China;
    dShenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
  • Received:2023-12-11 Revised:2024-01-29 Accepted:2024-02-23 Published:2024-12-01 Online:2024-04-09
  • Contact: * E-mail addresses: naxu@imr.ac.cn (N. Xu), zbbao@imr.ac.cn (Z.B. Bao) .

Abstract: To prolong the service lifetime of hot-section components used in marine environment at elevated temperatures, it is crucial to explore and develop high-temperature corrosion-resistant coatings. High-velocity oxygen fuel (HVOF) sprayed NiCoCrAlY, Pt-modified NiCoCrAlY and pre-oxidized Pt-modified NiCoCrAlY coatings were prepared and investigated. This study is concerned with the performance of three coatings in a simulated marine environment based on the phase composition of corrosion products and microstructure evolution of coating samples combined with first-principles density functional theory. The results show that the NiCoCrAlY coating was subject to accelerated corrosion and extensive aluminum depletion, leading to premature coating failure. The high-temperature corrosion resistance of Pt-modified NiCoCrAlY coating was found to be better than that of NiCoCrAlY coating. In contrast, the pre-oxidized Pt-modified NiCoCrAlY coating offered long-lasting protection and exhibited the best corrosion resistance, which is attributed to the positive synergistic effect between Pt modification and pre-oxidation.

Key words: High-temperature corrosion, HVOF-sprayed MCrAlY coating, Pt modification, Pre-oxidation, marine environment