Aluminum alloy wheel hub and its surface coating method and process

aluminum alloyhubIt has the advantages of fuel saving, good heat dissipation, extended engine life, good roundness, durability, etc., and has been widely used in the automobile industry.Aluminum alloy wheelsBeautiful appearance, has become a fashion in many countries and regions.

The surface coating process of aluminum alloy wheels includes: firstly pretreating the wheels, then spraying epoxy resin on the wheels by electrostatic spraying, then grinding and cleaning the powder, and coating the wheels by vacuum coating. The layer material is an alloy coating material such as aluminum, iron, nickel, etc.

The painting adopts four major processes of pretreatment, electrostatic spraying, vacuum coating and varnish to improve the bonding strength of the aluminum alloy wheel hub and the coating, and improve the corrosion resistance of the wheel hub. The method includes surface pretreatment of the aluminum alloy hub hub, spraying pre-coating, Spraying cr3c2 layer and post-processing steps, the step of spraying cr3c2 layer is to adopt the method of high-speed flame spraying to form a cr3c2 layer with a thickness ≥ 0.15mm on the surface of the hub and trim it to a predetermined thickness.

A 0.12-0.13mm pre-coating is formed on the aluminum alloy wheel surface by high-speed flame spraying method, and it is rotated to a roughness of 0.05-0.08mm. The pre-coating is composed of nickel-plated aluminum or aluminum-nickel powder.