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Cathodic deposition current density of the composite coatings increases when SiC par-ticles and rare earth (RE) were added in the bath, which is profitable for Ni- W-P alloy to deposit in the cathod, forming Ni-W-P-SiC and RE-Ni-W-P-SiC composite coatings. On the contrary, the addition of PTFE in the bath decreases cathodic deposition current density of the coatings. The current density increases a little when the amount of RE isγ-9g/l; however, the current density increases greatly when the amount of RE is increased to 11-13g/l. But if the amount of RE is raised further, the current density decreases. Hardness and wear resistance of RE-Ni-W-P-SiC composite coating have been studied, and the results show that the hardness and wear resistance of RE-Ni-W-P-SiC composite coating increase with increasing heat treatment tempera-ture, which reach peak values at 400℃; while the hardness and wear resistance of the coating decrease with the rise of heat treated temperature continuously.
Cathodic deposition current density of the composite coatings increases when SiC par-ticles and rare earth (RE) were added in the bath, which is profitable for Ni-WP alloy to deposit in the cathod, forming Ni-WP-SiC and RE-Ni -WP-SiC composite coatings. On the contrary, the addition of PTFE in the bath reduces cathodic deposition current density of the coatings. The current density increases a little when the amount of RE is gamma-9 g / l; however, the current density increases greatly when the amount of RE is increased to 11-13 g / l. But if the amount of RE is raised further, the current density decreases. Hardness and wear resistance of RE-Ni-WP-SiC composite coating have been studied, and the results show that the hardness and wear resistance of RE-Ni-WP-SiC composite coating increase with increasing heat treatment tempera-ture, which reach peak values at 400 ° C .; while the hardness and wear resistance of the coating decrease with the rise of heat treated temperature continuously.