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6 Processes for Aluminum Alloy Surface Treatment

Dec 20, 2019

Metal materials are increasingly used in various existing products, because metal materials can better reflect product quality / emphasize brand value, and among many metal materials, aluminum is easy to process / good visual effect and surface The processing methods are rich, and are used by various manufacturers first. The surface treatment of aluminum profiles is mainly divided into: sandblasting (form matte pearl silver surface), polishing (form mirror surface), drawing (form similar satin effect), electroplating (covering one layer) Other metals), spray coating (to cover other non-metallic coatings); The following metal processing editors will bring you some relaxing pictures, and experience the surface processing technology of aluminum and aluminum alloy in our daily products.

1.     Sand blasting

 Sand blasting

Sand blasting

The process of cleaning and roughening the metal surface by the impact of high-speed sand flow. This method of aluminum surface treatment can make the surface of the workpiece have a certain degree of cleanliness and different roughness, so that the mechanical properties of the surface of the workpiece can be improved, thus improving the fatigue resistance of the workpiece, and increasing Adhesion between them prolongs the durability of the coating film, which is also conducive to the leveling and decoration of the coating. This process is often seen in Apple's various products, and is increasingly used in the existing TV case or middle frame.



A machining method that uses mechanical, chemical, or electrochemical methods to reduce the surface roughness of a workpiece to obtain a shiny / flat surface. The polishing process is mainly divided into: mechanical polishing, chemical polishing, electrolytic polishing. The aluminum parts can be close to the stainless steel mirror effect after mechanical polishing + electrolytic polishing, giving people the feeling of high-end simplicity and stylish future (of course, it is easy to leave fingerprints and take care of them).



Metal wire drawing is a manufacturing process that repeatedly scratches aluminum plates with sandpaper. Drawing can be divided into straight drawing, random drawing, spiral drawing, thread drawing. The metal wire drawing process can clearly show each minute silk mark, so that the metal matte has a fine hair shine, and the product has both fashion and technology sense.



4. High-gloss cutting

Using a carving machine, the diamond knife is reinforced on the spindle of the carving machine that rotates at a high speed (typically 20,000 rpm) to cut parts, resulting in local highlight areas on the product surface. The brightness of the cutting highlight is affected by the milling speed. The faster the drill speed, the brighter the cutting highlight, otherwise the darker and more prone to cutting. High-gloss cutting is particularly used in mobile phones. In recent years, some high-end TVs have adopted high-gloss milling technology, anodizing and wire drawing technology to make the TV as a whole full of fashion and technology.

High-gloss cutting

High-gloss cutting

5. Anodizing

Anodizing refers to the electrochemical oxidation of metals or alloys. Under the corresponding electrolyte and specific process conditions, aluminum and its alloys form an oxide film on aluminum products (anodes) due to the applied current. Anodizing can not only solve the defects of aluminum surface hardness and abrasion resistance, but also extend the service life of aluminum and enhance the aesthetics. It has become an indispensable part of aluminum surface treatment and is currently the most widely used and very successful process.



6. Two-color anodizing

Two-color anodizing refers to anodizing on a product and giving specific areas different colors. Two-color anodizing is more costly because of the complicated process; but by comparing the two-color, the high-end and unique appearance of the product can be more easily revealed.


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