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What's the surface treatment processes for aluminum alloys?
2019-08-13

There are some common surface treatment processes for aluminum alloy:


Metal materials are used more and more in the existing products,because metal materials can better present product quality and highlight brand value. Among many metal materials, aluminum is easy to process and has good visual effect withabundant surface treatment methods.

The surface treatments of aluminum alloys are mainly divided into: sand blasting (formation of matte pearl silver surface), polishing (forming mirror surface), brushed (forming a satin-like effect), plating (covering one layer of other metal), spray (covering other non-metallic coatings) and anodizing (forming oxidation protection).

Let's take a look at the surface treatment process of aluminum alloys products.


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. (Sandblasted steel sand has several models: 80#, 120#, 240#, etc.)


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).


Brushed

Brushing is a manufacturing process in which the aluminum plate is repeatedly scraped out of the line by sandpaper. Drawing can be divided into straight brushing, chaotic brushing, spinning brushing, thread brushing. The brushing process can clearly show each of the fine silk marks, so that the matte light of the metal matt light, the product has both fashion and technology.

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 bit. The faster the bit speed, the brighter the cut light, and vice versa, the darker the blade.

High-light cutting is especially used in mobile phones, such as iphone5. In recent years, some high-end TV sets have adopted high-gloss milling technology, and the anodizing and brushed process makes the TV set full of fashion sense and technology sharpness.


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.


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.


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