Effect of laser power on microstructure and corrosion resistance of CrCoFeNiMoSi1.2B1.1 high entropy alloy laser clad coating

doi:10.13251/j.issn.0254-6051.2025.04.003

Abstract

Abstract: Effect of laser power on microstructure and corrosion resistance of the laser clad CrCoFeNiMoSi_1.2B_1.1 high entropy alloy (HEA) coating was studied. The results show that the coating exhibits single FCC structure under different laser powers. The microstructure in cross section of the coating can be divided into substrate, heat affected zone, fusion zone and HEA zone. The fusion zone is a mixed crystal structure composed of dense columnar crystals and equiaxed crystals when the laser power is 2600 W, while it is a fine equiaxed crystal when the laser power is 2200 W and 3000 W. The HEA coating is dendritic structure and Mo is enriched in dendrites. When the laser power is 2600 W, the FCC phase of the coating has better crystallinity and smaller grain boundaries/lattice defects, lower self-corrosion current density (2.40 μA/cm²), more positive self-corrosion potential (-0.2760 V), and larger impedance modulus (34 713.63 Ω·cm²) and the charge transfer resistance (3.22×10⁴ Ω·cm²), exhibiting superior electrochemical corrosion performance. This can be attributed to the combined effect of the higher crystallinity, fewer grain boundary/lattice defects, denser structure and passivation film, and a single FCC solid solution phase of the coating.

Key words: high entropy alloy coating, laser cladding, microstructure, electrochemical corrosion

CLC Number:

TG142.1

Jiang Sainan, Xie Fang, Zhai Changsheng, Zhang Xi, Zhang Xin. Effect of laser power on microstructure and corrosion resistance of CrCoFeNiMoSi_1.2B_1.1 high entropy alloy laser clad coating[J]. Heat Treatment of Metals, 2025, 50(4): 19-27.

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Effect of laser power on microstructure and corrosion resistance of CrCoFeNiMoSi_1.2B_1.1 high entropy alloy laser clad coating

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