Surface treatment of aluminum alloy

Because aluminum is widely used because of its easy processing, good visual effect and rich surface treatment methods, how much do you know about the surface processing technology of aluminum and aluminum alloy in daily products? Brushed rivets and lantern rivets are made of aluminum alloy. Aluminum itself has a waterproof and anti-corrosive effect, while being light in weight. Here are a brief description of the six major surface finishes for aluminum and aluminum alloys.

1.Sandblasting

The process of cleaning and roughening the metal surface by the impact of high velocity sand flow. The aluminum surface treatment of this method can achieve a certain degree of cleanliness and different roughness of the surface of the workpiece, so that the mechanical properties of the surface of the workpiece are improved, thereby improving the fatigue resistance of the workpiece and increasing the interaction between the coating and the coating. The adhesion enhances the durability of the coating and also contributes to the leveling and decoration of the coating. This process is often seen in Apple’s various products, and is increasingly used by existing TV sets or middle frames.

2. Polishing

Mechanical, chemical or electrochemical methods are used to reduce the surface roughness of the workpiece to obtain a bright, flat surface. The polishing process is mainly divided into: mechanical polishing, chemical polishing, and 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-grade simplicity and fashionable future (of course, it is easy to leave fingerprints and more care).

3. Drawing

Metal wire drawing is a manufacturing process in which the aluminum plate is repeatedly scraped out of the line by sandpaper. Drawing can be divided into straight drawing, chaotic drawing, spinning drawing, thread drawing. Metal processing WeChat, the content is good, it is worthy of attention. The metal wire drawing process can clearly show each of the fine silk marks, so that the matte light in the metal matt light, the product has both fashion and technology.

4. High-light cutting

The diamond knives are reinforced with a fine carving machine to cut the parts on the spindle of the high-speed rotation (typically 20,000 rpm) to produce a local highlight on the surface of the product. The brightness of the cut highlight is affected by the speed of the milling tool. The faster the tool speed, the brighter the cut light is. On the contrary, the darker the surface, the more likely the blade is. High-light high-light cutting is especially used in mobile phones. In recent years, some high-end TV sets have adopted high-gloss milling technology, and the anodizing and wire drawing process makes the TV set full of fashion sense and technology sharpness.

5. Anodizing

Anodizing refers to the electrochemical oxidation of metals or alloys, and the formation of an oxide film on aluminum products (anodes) by aluminum and its alloys under the corresponding electrolyte and specific process conditions due to the application of current. Anodizing can not only solve the defects of aluminum surface hardness and wear resistance, but also prolong the service life of aluminum and enhance the appearance. It has become an indispensable part of aluminum surface treatment, and it is the most widely used and very successful. Process.

6. Two-color anodizing

Two-color anodization refers to anodization on a product and imparting a different color to a particular area. The two-color anodizing process is complicated and costly; however, the contrast between the two colors can better reflect the high-end and unique appearance of the product.