Metal materials are used more and more in all kinds of existing products, because metal materials can better reflect product quality and highlight brand value. Among many metal materials, aluminium is used by various manufacturers because of its advantages of easy processing, good visual effect and rich surface treatment methods. The surface treatment of aluminium profiles is mainly divided into sand blasting (forming matte pearl silver surface) and polishing (shape). Mirror forming, wire drawing (forming a satin-like effect), electroplating (covering a layer of other metals), spraying (covering other non-metallic coatings)
Next, we will feel the surface processing technology of aluminium and aluminium alloys in our daily products.
1. Sandblasting (shot peening)
The process of cleaning and roughening metal surface by the impact of high-speed sand flow. The surface treatment of aluminium parts by this method can obtain a certain degree of cleanliness and different roughness, and improve the mechanical properties of the workpiece surface, thus improving the fatigue resistance of the workpiece, increasing the adhesion between the workpiece and the coating, prolonging the durability of the coating, and also conducive to the leveling and decoration of the coating. This process is often seen in Apple’s products, and is increasingly used in existing TV shells or midframes.
2. polishing
By means of mechanical, chemical or electrochemical methods, the surface roughness of the workpiece is reduced to obtain a bright and flat surface processing method. Polishing technology is mainly divided into: mechanical polishing, chemical polishing, electrolytic polishing. Aluminum parts with mechanical polishing and electrolytic polishing can approach the mirror effect of stainless steel, giving people a feeling of high-grade, simple, fashionable future (of course, easy to leave fingerprints but also more care).
3. wire drawing
Metal wire drawing is the process of repeatedly scraping aluminium sheet out of the line with sandpaper. Drawing can be divided into straight wire drawing, screwed wire drawing, screwed wire drawing, screwed wire drawing. Metal wire drawing process can clearly show each fine trace, so that the metal matte gloss in the exudation of fine silk luster, products both fashionable and technological sense.
4. High-light cutting
The diamond knife is strengthened on the spindle of the high-speed rotary fine-engraving machine with a fine-engraving machine to cut parts, and a local bright area is generated on the surface of the product. The brightness of cutting highlight is affected by the speed of the milling bit. The faster the bit speed is, the brighter the cutting highlight is. On the contrary, the darker the cutting highlight is and the easier the cutter grain is. In recent years, high-light milling technology has been used in some metal frames of high-end TV sets. In addition, anodic oxidation and wire drawing technology make TV sets full of fashion sense and sharp sense of science and technology.
5. Anodic oxidation
Anodic oxidation refers to the electrochemical oxidation of metals or alloys. Aluminum and its alloys form an oxide film on aluminium products (anodes) under the action of applied current under the corresponding electrolyte and specific technological conditions. Anodic oxidation can not only solve the defects of surface hardness and wear resistance of aluminium, but also prolong the service life of aluminium and enhance its beauty. It has become an indispensable part of surface treatment of aluminium. It is the most widely used and very successful process at present.
6. Bicolor Anodic Oxidation
Dual-color anodization refers to the process of anodizing a product and giving different colors to a specific area. Dual-color anodic oxidation has high cost because of its complex process, but through the contrast between the two colors, it can better reflect the high-end and unique appearance of the product.
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