Powder coating, also known as plastic spraying. The workpiece is preheated or not, use a spray gun or immerse the workpiece into the tumbling powder, the powder is electrostatically adsorbed on the metal surface, and then heated to solidify the powder on the metal surface. There are epoxy resin powder, polyester powder, nylon powder and so on. Coating thickness ranges from 30-300um. Available in many colors, blue is common. The surface anti-corrosion effect is good, generally 5-10 years.

Electrophoretic paint is to immerse the conductive coated object in an electrophoretic paint tank filled with water and dilute with a relatively low concentration as an anode (or cathode), and a corresponding cathode (or anode) is set in the tank. A special coating method that deposits a uniform, fine, water-insoluble coating film on the surface of the object to be coated after indirect direct current for a period of time. The coating thickness ranges from 15-25um, which is relatively thin. Usually black. The surface anti-corrosion effect is good. The cost is relatively low.

Electro-galvanizing, electro-nickel plating, electro-chrome plating, also known as cold plating, is a method of laying a layer of metal on a conductor by using the principle of electrolysis. Electroplating refers to a surface processing method in which the cations of the pre-plated metal in the plating solution are deposited on the surface of the base metal by electrolysis with the base metal to be plated as the cathode in a salt solution containing pre-plated metal to form a coating.