Film coating process for aluminium alloy wheel hub

Abstract

The invention discloses an aluminum alloy wheel hub film-coating process. The aluminum alloy wheel hub film-coating process comprises the steps of oil removing, cleaning and drying, pre-treating, epoxy polyester powder spraying and solidifying, grinding I, methyl methacrylate-acrylate copolymer paint spraying and solidifying, grinding II, polybutadiene high temperature-resistant insulating film-coating spraying and solidifying, vacuum cathode arc ion chromium plating and magnetism control sputtering aluminum plating, and polyurethane methacrylate light solidifying paint spraying and solidifying sequentially. The invention adopts dry electric plating to replace the traditional wet electric plating, the plating layer surface quality and the physical and chemical properties are approximatelyequivalent to that of the wet electric plated aluminum alloy wheel hub, the chromium consumption is reduced to about one fifth of the wet electric plating, the water consumption is reduced to about one seventh of the wet electric plating, precious nickel and copper are not utilized, the poisonous metal substance such as hexavalent chromium is not contained, the pollution to the environment is reduced, the energy, water and precious metal consumption is remarkably reduced, the technological flow is simplified, the production efficiency is enhanced, the heavy polishing working sequence is omitted, the working condition is remarkably improved, and the cost is reduced.

Description

【Technical Field】 [0001] The invention relates to the field of material surface treatment, in particular to a method for coating an aluminum alloy wheel hub. 【Background technique】 [0002] Aluminum alloy wheels have been widely used in many industrial sectors, especially automobile and motorcycle manufacturing. Over the years, the production technology of wet electroplated aluminum alloy wheels has become mature, with high surface quality, very bright, excellent decoration, wear resistance, corrosion resistance, and heat resistance. [0003] The current wet electroplating process for aluminum alloy wheels is: rough → inspection → degreasing → cleaning → dewaxing → secondary cleaning → drying → finishing → hanging parts → cleaning → alkali corrosion → secondary cleaning → acid corrosion → secondary cleaning → Dipping ternary coating layer → decoating layer → secondary cleaning → re-dipping ternary coating layer → secondary cleaning → pre-coating dark nickel → recycling → secondary...

AI Technical Summary

Problems solved by technology

[0005] 1. The electroplating waste liquid contains toxic metals, especially hexavalent chromium, which needs to be treated with three wastes. The treatment process is complicated, the treatment cost is high, and environmental pollution cannot be completely eliminated;

[0006] 2. It needs to consume a lot of precious metals such as copper, nickel, chromium, etc. The purchase price of these metals is high, and nickel and chromium are still in short supply in our country;

[0007] 3. It consumes a lot of energy and water. It takes more than 1 ton of water to process a hub;

[0008] 4. There are many processes and the process is complicated;

[0009] 5. Poor production conditions have a certain impact on the health of workers;

[0010] 6. The total cost of production is high

[0011] Therefore, the traditional aluminum alloy wheel electroplating process can no longer meet the needs of factors such as environment, energy saving, water saving, and cost. It is urgent to develop a method that can reduce environmental pollution, significantly reduce energy consumption, water consumption, and precious metal consumption, and simplify the process. process, improve production efficiency, and a low-cost aluminum alloy wheel coating method

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