Although the aluminum alloy composition and heat treatment have greatly improved the performance of aluminum alloys, in many cases it is also required that the aluminum alloy surface has special properties such as wear resistance and corrosion resistance, and most of the failure of aluminum alloy materials starts from the surface, so It is particularly important to improve the surface properties of materials. Surface treatment can improve protection, decoration and functionality, overcome the shortcomings of aluminum alloy surface performance, expand the scope of application, and extend the service life.

Aluminum alloy materials have the advantages of low density, low thermal expansion coefficient, high specific steel and specific strength, but in practical applications, aluminum alloys present many problems such as low surface hardness, poor abrasion resistance and corrosion resistance. The application range of aluminum alloy is largely restricted. Although the aluminum alloy composition and heat treatment have greatly improved the performance of aluminum alloys, in many cases it is also required that the aluminum alloy surface has special properties such as wear resistance and corrosion resistance, and most of the failure of aluminum alloy materials starts from the surface, so It is particularly important to improve the surface properties of materials.

Surface treatment can improve protection, decoration and functionality, overcome the shortcomings of aluminum alloy surface performance, expand the scope of application, and extend the service life.
Briefly introduce six common methods of aluminum alloy surface treatment:
[1] Sandblasting
The process of cleaning and roughening the surface of aluminum alloy by the impact of high-speed sand flow. The surface treatment of aluminum parts by this method can obtain a certain degree of cleanliness and different roughness of the surface of the workpiece, and improve the mechanical properties of the surface of the workpiece, thereby improving the fatigue resistance of the workpiece and increasing the distance between it and the coating. The adhesion has prolonged the durability of the coating film and 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.
[2] polishing
A machining method that uses a mechanical, chemical, or electrochemical method to reduce the surface roughness of a workpiece to obtain a bright, 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.
[3] Drawing
Metal wire drawing is the manufacturing process of repeatedly scraping the aluminum plate out of the line with sandpaper. Drawing can be divided into straight drawing, random drawing, spiral drawing, thread drawing. Metal machining WeChat, the content is good, worthy of attention. The metal wire drawing process can clearly show each tiny 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 speed of the milling drill. The faster the drill speed, the brighter the cutting highlight, otherwise the darker and prone to cutting. Metal machining WeChat, the content is good, worthy of attention. High-gloss high-gloss cutting is particularly used in mobile phones, such as iphone7. In recent years, some high-end televisions have adopted high-gloss milling technology on the metal frame. In addition, anodizing and wire drawing have made the whole TV full of fashion and technology.
[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 Craft.
[6] Two-shot anodizing
Two-shot anodizing refers to anodizing on a product and giving different areas a different color. Two-color anodizing is more costly because of the complicated process; but the contrast between the two colors can better reflect the high-end and unique appearance of the product.