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

作　　者：Y.Y.Li Y.M.Jiang C.Zhang H.Z.Ji S.Li N.Xu Z.B.Bao S.L.Zhu F.H.Wang 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China [2]Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [3]National Engineering Research Center of Special Equipment and Power System for Ship and Marine Engineering,No.703 Research Institute of CSSC,Harbin 150078,China [4]Shenyang National Laboratory for Materials Science,Northeastern University,Shenyang 110819,China

出　　处：《Journal of Materials Science & Technology》2024年第34期222-235,共14页材料科学技术(英文版)

基　　金：supported by the National Science and Technology Major Project(No.J2019-IV-0006-0074);the Key Research Program of the Chinese Academy of Sciences(No.ZDRW-CN-2021-2-2);the National Natural Science Foundation of China(No.52301116);support by the Joint Funds of the National Natural Science Foundation of China(“Ye Qisun”Science Funds,No.U2241251);the Innovation Engineering Project(No.211-XXXX-N106-01).

摘　　要：To prolong the service lifetime of hot-section components used in marine environment at elevated tem-peratures,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 coat-ings in a simulated marine environment based on the phase composition of corrosion products and mi-crostructure 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.

关 键 词：High-temperature corrosion HVOF-sprayed MCrAlY coating Pt modification PRE-OXIDATION marine environment 

分 类 号：TG1[金属学及工艺—金属学]