Surface treatment method of aluminum alloy die casting

In the custom project of precision parts processing, aluminum alloy is often used as the material for the parts processed by the lathe. And it’s also a popular material for customers, especially in automotive parts machining applications. In order to obtain a better surface effect, precision mechanical parts processing plants must follow the method of surface treatment of aluminum alloy die castings.


In lathe machining parts, the surface treatment of aluminum alloy die castings is divided into pre-treatment and post-treatment. The purpose of pre-treatment is to remove the oxide scale and oil stains on the surface, increase the adhesion of post-treatment, and improve the appearance effect. The most common is pre-treatment. Treatment methods include shot peening, sand blasting and phosphating. The post-treatment generally adopts spraying, oxidation, electroplating and electrophoresis. Other surface treatment methods are only suitable for products with special requirements for cost reasons.

From the point of view of the cost of precision parts processing and customization, the pretreatment of machinery to your manufacturer is shot peening, sandblasting, phosphating, polishing, spraying, electrophoresis coating, oxidation, electroplating, etc. After phosphating, it can only be sprayed and electrophoresed, but not oxidized or electroplated.

In terms of decoration and anti-corrosion, the pre-treatment of machinery to your manufacturer is polishing → phosphating → sand blasting → shot blasting, oxidation → electroplating → spraying → electrophoresis coating, and the car engine casing is generally shot blasting and spraying.

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