A vacuum coating production process for high physical and chemical performance automobile hubs

Abstract

The invention relates to a vacuum coating production process of an automobile hub with high physical and chemical properties. The production process comprises the following steps: (1) processing a hub blank; (2) inspecting and polishing the hub blank; (3) removing oil; (4) cleaning and drying; (5) carrying out pre-treatment; (6) spraying body powder and curing; (7) polishing; (8) spraying medium powder and curing; (9) vacuum coating: spraying a metal coating on the treated hub in a vacuum chamber according to a vacuum sputter coating principle; (10) preparing a transparent coating; and (11) finally inspecting and packaging, wherein the passivation coating is a chromate-free passivation coating and the metal coating is an aluminum film. According to the production process provided by the invention, the surface evenness and the corrosion resistance of the hub are improved, the evenness, the gloss, the hardness and the corrosion resistance of the surface of the hub are increased, the surface of the hub is sealed and metallized, and the hub has glossiness of water electroplating. The transparent coating has an adhesive force of a high vacuum coating. The production process provided by the invention is concise and low in energy consumption, and the prepared hub is high in hardness and strong in corrosion resistance.

Description

technical field [0001] The invention relates to a vacuum coating process for metal products, in particular to a vacuum coating production process for automobile hubs with high physical and chemical properties. Background technique [0002] At present, the rapid development of automobiles has also led to the rapid development of wheels. Aluminum alloy wheels have become mainstream wheel products due to their beautiful appearance, light weight, fast heat dissipation, and high roundness. Aluminum alloy wheels are mainly formed by die-casting, and the surface is rough. After machining, there are burrs, scratches and other defects on the surface that require surface treatment. The current surface treatment methods include painting, water electroplating, and vacuum coating. Among them, painting and water electroplating are widely used. Water electroplated wheels have good surface quality such as high brightness and wear resistance, but there are many problems in the production p...

AI Technical Summary

Problems solved by technology

Water electroplated wheels have good surface quality such as high brightness and wear resistance, but there are many problems in the production process: (1) After the aluminum alloy wheels are formed, the surface is rough. Very meticulous polishing is required. Due to the complex wheel shape, this process is time-consuming, high cost, poor working conditions, and low blank utilization rate; (2) Aluminum alloys are difficult-to-plate metals, and the pre-plating pretreatment is strict and the operation is complicated; (3) ) The electroplating production process consumes a large amount of water resources and produces a large amount of waste water and waste gas; (4) The bottom layer of the plating layer uses zinc copper nickel as the bottom layer and chrome as the surface layer, which consumes a large amount of precious metals and produces a large amount of heavy metal wastewater; (5) The impact on the environment The degree of destruction is large, and the treatment of the three wastes of electroplating (waste water, waste gas, waste residue) is difficult, costly and cannot be completely cured. This is an international problem. Many electroplating factories in developed countries have been transferred to developing countries. China's environmental aspects The requirements are getting higher and higher, and many big cities have replaced water electroplating with vacuum coating

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