Study on Hardness Optimization of 7075 Aluminum Alloy with Aluminum-graphene Composite Coating
Aluminum-graphene composite coating was prepared under organic system,and the optimum process of hardness and wear resistance of 7075 aluminum alloy was studied.The effects of process parameters on the surface hardness and wear resistance of the composites were studied by orthogonal test,and the effects of graphene concentration and current density on the hardness were analyzed by single factor test.The micro-morphology,phase structure and the existence of graphene of the composite coating were characterized and analyzed by SEM,XRD and Raman spectra.The results show that the order of the effects of process parameters on the hardness and wear resistance of the composites is as follow:graphene concentration>current density>electroplating time>stirring speed.With the increase of graphene concentration and current density,the hardness of the composites increases at first and then decreases.Under the optimized process,the hardness of the composite surface is 229.9%higher than that of the matrix,while the friction coefficient is 90.1%lower than that of the matrix,indicating that the excellent mechanical strength and self-lubricity of graphene strengthen the mechanical properties of the composite.
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