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Effect of magnetic field on microstructure and Inconel 718 content on corrosion resistance of laser cladding WTaNbMo/Inconel 718 composite coatings
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DOI：10.1007/s42243-026-01881-6.png)
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Abstract
En 中文
WTaNbMo/Inconel 718 composite coatings were successfully fabricated using magnetic field-assisted laser cladding. Numerical simulations of the magnetic field-assisted laser cladding process were conducted to elucidate the influence of the magnetic field on the temperature and flow fields of the molten pool. The applied magnetic field enhanced melt convection, which promoted heat exchange with the laser beam and led to a more uniform energy distribution, thereby improving both the macroscopic forming quality and the microstructure of the coating. Furthermore, the influence of Inconel 718 content on the microstructure, hardness, and corrosion resistance was systematically investigated. Experimental results demonstrated that increasing the Inconel 718 content effectively eliminated micro-defects and significantly improved the corrosion resistance, albeit with a concomitant reduction in coating hardness. An optimal balance between hardness and corrosion resistance was achieved at 30 wt.% Inconel 718 content, with a hardness of 849.48 HV and a corrosion rate of 0.112 mm a−1. The superior corrosion resistance is primarily attributed to the formation of a protective passive film enriched with Cr2O3, NiO, and Ni(OH)2, which acts as an effective barrier against chloride ion penetration and suppresses anodic dissolution.
Keywords:
Magnetic field assistance
Laser cladding
Composite coating
Microstructure
Corrosion resistance
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