Abstract
Electrodeposited Ni-Fe-Graphene composite coatings have been prepared on the aluminum alloy substrate from alkaline Ni-Fe alloy electrolyte with varied graphene nanoplatelets (GNPs) concentrations from 0.05 g L−1 to 3 g L−1. The effect of graphene concentration on the microstructure, element composition and mechanical property of Ni-Fe-Graphene composite coating has been investigated. The results indicate that the incorporation of GNPs into the coatings promotes the co-deposition of Ni2+ in the electrolyte. Graphene content presents a negative correlation with the iron content in the composites. Graphene content and dispersion in the coatings both play a key role in the properties and when graphene concentration is 1 g L−1, Ni-Fe-Graphene composite coating exhibits the highest hardness (912.6 HV) and best wear resistance (friction coefficient of 0.1990). It is attributed to the grain refinement, excellent mechanical property and self-lubricant of GNPs. The morphology, microstructure and element composition of deposited composites have been characterized using scanning electron microscopy (SEM), energy disperse spectroscopy (EDS), X-ray diffraction (XRD). Raman spectrum is used to characterize the presence of GNPs in the composites.
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