▎ 摘　　要

NOVELTY - Preparing a copper or graphene-plated magnesium alloy composite material involves insulating aluminum and zinc at 150-170 degrees C, smelting the aluminum after the heat preservation is completed, and adding zinc to the aluminum melt and mixing, and melting the zinc and then maintaining to obtain an aluminum-zinc (Al-Zn) alloy melt. A magnesium alloy that is kept under vacuum at 300-410 degrees C is inserted into the Al-Zn alloy melt when the temperature of the Al-Zn alloy melt is 600-640 degrees C and is in a semi-solid state. The temperature is reduced to 390-410 degrees C, and the temperature is maintained, and then the temperature is raised to 600-640 degrees C to make the Al-Zn alloy melt into a semi-solid state. The magnesium alloy is taken out to obtain a magnesium alloy with a composite casting layer on the surface. USE - Method for preparing a copper or graphene-plated magnesium alloy composite material. ADVANTAGE - The method enables to prepare a copper or graphene-plated magnesium alloy composite material in a simple way, and realizes direct electroplating on a precast intermediate layer of a magnesium alloy to obtain a wear-resistant and corrosion-resistant coating. DETAILED DESCRIPTION - Preparing a copper or graphene-plated magnesium alloy composite material involves insulating aluminum and zinc at 150-170 degrees C, smelting the aluminum after the heat preservation is completed, and adding zinc to the aluminum melt and mixing, and melting the zinc and then maintaining to obtain an aluminum-zinc (Al-Zn) alloy melt. A magnesium alloy that is kept under vacuum at 300-410 degrees C is inserted into the Al-Zn alloy melt when the temperature of the Al-Zn alloy melt is 600-640 degrees C and is in a semi-solid state. The temperature is reduced to 390-410 degrees C, and the temperature is maintained, and then the temperature is raised to 600-640 degrees C to make the Al-Zn alloy melt into a semi-solid state. The magnesium alloy is taken out to obtain a magnesium alloy with a composite casting layer on the surface. The surface treatment of the magnesium alloy containing the composite casting layer is performed to make the surface smooth, and then electroplating the copper alloy at 50-70 degrees C in a copper plating solution to obtain a copper or graphene-plated magnesium alloy composite material. The copper plating solution includes 10-20 g/L of copper sulfate pentahydrate, 10-32 g/L of sodium pyrophosphate, 10-30 g/L of potassium pyrophosphate, 10-20 g/L of sodium tartrate, and 1-5 mg/L graphene with a single layer ratio of 95%, and the copper plating solution has a pH of 10-12, and the pH value is adjusted with sodium hydroxide. An INDEPENDENT CLAIM is included for a copper or graphene-plated magnesium alloy composite material, which comprises matrix of the composite material is a magnesium alloy, an Al-Zn composite casting layer is contained on the surface of the magnesium alloy, and copper and graphene are plated on the Al-Zn composite casting layer, where the contact surface of the magnesium alloy and the Al-Zn composite casting layer forms a Mg-Al or Mg-Zn compound or a solid solution.