Aluminum alloy surface treatment technology

Surface treatment includes sandblasting, polishing,drawing, high gloss cutting, anodizing, double-color anodizing and other processes. The purpose of mechanical treatment is to eliminate the uneven surface of the product and remedy other bad surface appearance phenomena. Chemical treatment can remove the oil stains on the surface of the product, and form a layer that can make the film-forming material better combined or transformed into active metal body, to ensure that the coating has a stable state, increase the binding force of the protective layer, so as to achieve the effect of protecting the body.

1. Sandblasting

The process of cleaning and coarsening metal surfaces by the impact of high speed sand flow. This method can make the surface of the aluminum parts to obtain a certain degree of cleanliness and different roughness, improve the fatigue resistance of the workpiece, the adhesion between the coating is strong, prolong the durability of the coating film, but also conducive to the paint flow and decoration.

2. Polishing

A process in which the surface roughness of a workpiece is reduced by mechanical, chemical or electrochemical means to obtain a bright, flat surface.

3. Drawing

Wire drawing is the manufacturing process of repeatedly scraping an aluminum sheet out of the wire with sandpaper. Wire drawing can be divided into straight wire drawing, random wire drawing, spiral wire drawing, thread drawing.

4. Specular cutting

The diamond cutter is reinforced by the engraving machine in the high speed rotation (general speed is 20000 RPM) of the engraving machine spindle to cut parts, resulting in local highlighting area on the surface of the product. In recent years, some high-end electronics, such as television sets, have adopted high-gloss milling of their metal frames, as well as anodizing and drawing processes to give televisions a sense of fashion and technological sharpness.

5. Anodizing

Anodic oxidation refers to the electrochemical oxidation of metal or alloy, aluminum and its alloy in the corresponding electrolyte and specific process conditions, due to the action of external current, in the process of forming a layer of oxide film on the aluminum products (anode). Anodic oxidation can prolong the service life and enhance the appearance of aluminum, which is the most widely used and very successful process at present.

6. Dual color anodizing

Two-color anodizing refers to anodizing a product and giving a specific area a different color. The cost of two-color anodic oxidation is high because of the complexity of the process. But through the contrast between the two colors, more can reflect the high-end products, unique appearance.

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