Aluminum alloy wheels have the advantages of fuel saving, good heat dissipation, extended engine life, good roundness, and durability, and have been widely used in the automotive industry. Aluminum alloy wheels have beautiful appearance and have become a fashion trend. The surface coating process of aluminum alloy wheels includes: pre-treating the wheels first, then spraying epoxy resin on the wheels by electrostatic spraying, and then coating the wheels by powder grinding, cleaning, and vacuum coating. The coating materials are Aluminum, iron, nickel and other alloy coating materials. The high-speed flame spraying method is used to form a 0.12-0.13mm pre-coat on the surface of the aluminum alloy wheel, and rotate to a roughness of 0.05-0.08mm. The pre-coat is composed of Ni-Al or Ni-Ni powder.
Coating pretreatment, electrostatic spraying, vacuum spraying, and varnish are four processes to improve the bonding strength of aluminum alloy wheels and coatings, and improve the corrosion resistance of wheels. The methods include surface pretreatment of aluminum alloy wheels, spraying coatings, and spraying cr3c2 layers The post-processing step and the cr3c2 spraying step adopt the method of high-speed flame spraying to form a cr3c2 layer with a thickness of 0.15mm or more on the surface of the hub, and finish it to a predetermined thickness. Tags: alloy wheels.