Study on Preparation and Corrosion Resistance of Graphene-Ni_(35)Co_(30)Cu_(20)Fe_(15) High Entropy Alloy Composites

摘要

The graphene/Ni_(35)Co_(30)Cu_(20)Fe_(15) high entropy alloy composites were successfully prepared by ball milling and spark plasma sintering (SPS) methods. The microstructures and structures of graphene and composites were measured by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Raman spectroscopy. The hardness and corrosion resistance of the composites were tested by Vivtorinox hardness tester and chemical workstation. The results showed that the homogeneous distribution of graphene in the composites can be achieved by ball milling, and the original structure of graphene was not destroyed. The addition of graphene improved the hardness and corrosion resistance of high entropy alloy composites. Compared with the Ni_(35)Co_(30)Cu_(20)Fe_(15) high entropy alloy, the hardness of the high entropy alloy with 0.3 wt.% Graphene increased from 255HV to 310HV. The addition of graphene increased the corrosion potential of the composite in 3.5% NaCl solution from -0.5V to -0.2V and the corrosion current density from 2×10~(-5)A/cm~2 reduced to 8×10~(-6)A/cm~2, which greatly improved the corrosion resistance of the material.