Roller plating For small products, according to the pre-calculated load into the plating cylinder and electroplating, plating process can make the product obtain uniform coating thickness. For example, the electrode contact composite coating of consumer electronics products is rolled gold/palladium/gold/platinum/rhodium ruthenium, which has excellent corrosion resistance to electrolytic sweat. It can cope with a variety of complex use environments, especially resist the erosion of sweat during exercise, and greatly improve the service life of the product.