Surface processing technology of aluminum and aluminum alloy

Aluminum is widely used because of its easy processing, good visual effect, rich surface treatment means, etc. How much do you know about the surface processing technology of aluminum and aluminum alloys in daily products? Mobile phone frame, charging bank, wire drawing rivet and lantern rivet are all made of aluminum alloy. Aluminum itself has the effect of waterproof and anti-corrosion, and is light in weight. The following sections will briefly describe the six major surface processing technologies of aluminum and aluminum alloys.

1. Sand blasting (shot blasting)

The process of cleaning and roughening metal surfaces by the impact of high-speed sand flow. This method of aluminum surface treatment can make the surface of the workpiece get a certain degree of cleanliness and different roughness, and improve the mechanical properties of the workpiece surface. Therefore, it improves the fatigue resistance of the workpiece, increases the adhesion between it and the coating, extends the durability of the coating, and is also conducive to the leveling and decoration of the coating. This process is often seen in various products of Apple, and is increasingly used by the existing TV surface shell or middle frame.

2. Polishing

It is a processing method that uses mechanical, chemical or electrochemical methods to reduce the surface roughness of the workpiece to obtain a bright and flat surface. The polishing process is mainly divided into mechanical polishing, chemical polishing and electrolytic polishing. After mechanical polishing+electrolytic polishing, the aluminum parts can approach the stainless steel mirror effect, giving people a sense of high-end simplicity and fashion in the future (of course, more care should be taken if it is easy to leave fingerprints).

3. Wire drawing

Metal wire drawing is the manufacturing process of repeatedly scraping aluminum plates out of lines with sandpaper. Wire drawing can be divided into straight wire drawing, random wire drawing, spiral wire drawing and thread wire drawing. WeChat of metal processing has good content and deserves attention. The metal wire drawing process can clearly show every trace of fine wire, so that the metal matt can have a fine hair luster. The product has a sense of fashion and technology.

4. High gloss cutting

The precision engraving machine is used to reinforce the diamond cutter on the high speed rotating (generally 20000 rpm) precision engraving machine spindle to cut parts, creating local highlights on the product surface. The brightness of the cutting highlights is affected by the speed of the milling drill. The faster the drill speed is, the brighter the cutting highlights will be. On the contrary, the darker the highlights will be and the tool lines will be easily generated. WeChat of metal processing has good content and deserves attention. The use of high gloss and high gloss cutting in mobile phones is particularly abundant, such as the iPhone 5. In recent years, some high-end TV metal frames have adopted high gloss milling technology, and the anodizing and wire drawing process has made the TV full of fashion and scientific sharpness.

5. Anodizing

Anodic oxidation refers to the electrochemical oxidation of metals or alloys. Under the corresponding electrolyte and specific process conditions, aluminum and its alloys form a layer of oxide film on aluminum products (anodes) under the action of applied current. Anodizing can not only solve the defects in aluminum surface hardness and wear resistance, but also prolong the service life of aluminum and enhance its aesthetic quality. It has become an indispensable part of aluminum surface treatment and is the most widely used and successful process at present.

6. Double color anodizing

Two color anodizing refers to anodizing a product and giving different colors to specific areas. Double color anodizing has high cost due to its complex process; However, through the contrast between two colors, it can better reflect the high-end and unique appearance of the product.