Cailiao Baohu (Oct 2023)

Study on Microstructure and Properties of CoMoCrNi Coating Prepared by Vacuum Cladding

  • JIA Keming, HU Ming, YU Haicheng, JIAO Yufeng, LIU Jinlong, SONG Xiaogang

DOI
https://doi.org/10.16577/j.issn.1001-1560.2023.0239
Journal volume & issue
Vol. 56, no. 10
pp. 92 – 98

Abstract

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For improving the wear resistance and corrosion resistance of 38CrMoAl steel substrate, CoMoCrNi alloy powder was used as the research object to be mixed with a special binder and coated on the surface of 38CrMoAl steel substrate,and subsequently,the CoMoCrNi coating was prepared by vacuum cladding.The structure and comprehensive performance of the coating were investigated through XRD, SEM and its accompanying EDS instrument, hardness test, abrasive wear test, acidic salt spray test and electrochemical corrosion test.Results showed that the as-prepared CoMoCrNi coating had the smooth surface with metallic luster.The coating was composed of Co-based solid solution and Co3Mo2Si hard Laves phase, and the structure was fine, uniform and dense.In addition, a strong metallurgical bond was formed between the CoMoCrNi coating and the substrate.The micro-Vickers hardness of the substrate/coating exhibited a gradient distribution pattern, and there were dispersed hard phases in the coating,which had a much higher microhardness than the substrate.The wear resistance and corrosion resistance of CoMoCrNi coating were higher than those of the base material.Furthermore, compared with the self-fluxing cobalt-based alloy coatings prepared by current mainstream surface processing technologies such as laser cladding and surfacing welding, the CoMoCrNi coating prepared by the vacuum cladding method showed better wear resistance and corrosion resistance.In general, the coating possessed a stronger comprehensive load-bearing capacity, which could be expected to be used in complex working conditions.

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