METHOD OF PLATING COPPER ON MAGNESIUM ALLOY AND COPPER PLATING MAGNESIUM ALLOY

摘要

A method of plating copper on a magnesium alloy and a copper-plated magnesium alloy are provided to form an electro-copper layer on a magnesium alloy surface without an electroless copper plating process by using pyrophosphate copper plating solution including the compound of alkali metal and fluorine or ammonia and fluorine. A method of plating copper on a magnesium alloy and a copper-plated magnesium alloy comprises following steps. A magnesium alloy surface is fat-removed and is pickled. The pyrophosphate solution consisting of potassium pyrophosphate 200 g/l~350 g/l and cupric pyrophosphate 50 g/l~120 g/l is formed. The compound 20 g/l~90 g/l of the fluorine and alkali metal is added to the pyrophosphate solution and the electrolyte composition is formed and the magnesium alloy surface is dipped. The copper is plated on the magnesium alloy by applying current of 5~200mA/cm^2 in the electrolyte composition and controlling pH into 8.5~10.5. The temperature of composition is 45~65°C. The compound of the fluorine and alkali metal is the lithium fluoride the sodium fluoride or the potassium fluoride.