Electrodeposition and properties of Ni-W-Ti2AlC composite coatings

A composite coating of Ni-W-Ti2AlC was fabricated through direct current electrodeposition. The characterization of the composite coatings included analysis using X-ray diffractometry, scanning electron microscope, energy spectrum analysis, Vickers microhardness testing, electrochemical testing, and tribological testing. The findings indicate that the inclusion of Ti2AlC alters both the grain size and microstructure of the coatings. The presence of Ti2AlC particles facilitates the nucleation process during Ni-W-Ti2AlC deposition. The Ti2AlC content influences the coating's performance in the bath. Specifically, the microhardness of the Ni-W-(5 g/L) Ti2AlC coating exhibits the highest value, experiencing a 41.89 % increase compared to that of the Ni-W coating. Ti2AlC contributes to the rectification of defects in the Ni-W-Ti2AlC coating. This composite coating exhibits the lowest corrosion current and superior corrosion resistance, particularly with a Ti2AlC concentration of 5 g/L. The wear mechanism of the coating encompasses abrasive wear, adhesive wear, and oxidation wear. Notably, the Ni-W-Ti2AlC composite coating demonstrates enhanced friction resistance compared to the Ni-W composite coating. Incorporating Ti2AlC introduces a novel approach and avenue for fabricating high-performance tungsten-based functional coatings.