The surface treatment process of aluminum alloy mainly includes: surface etching, surface finishing, anodizing coloring process, surface spraying and surface plating process. It is through these rich surface treatment processes that the products of various aluminum alloy materials in our lives can show different personalized appearance textures and colors, etc., which enrich the spiritual appearance of the products and enrich our colorful material world.
Firstly, the surface etching texture process
Metal etching is a technique that removes a material using a chemical reaction or physical impact.
Aluminum alloy etching decoration can emboss a three-dimensional decorative pattern or text on the surface of the material, which can flexibly show different curvatures or radians. Not easy to deform is very suitable for personalized product engraving and printing.
Secondly, the surface finishing texture technology
1. Polishing is for the purpose of obtaining smooth surface or specular gloss, and sometimes also used to eliminate gloss (matting). Polished aluminum has excellent reflectivity over a wide range of wavelengths, so it has various decorative uses and uses with reflective functionality. Its natural surface state has a pleasant appearance. It is soft and shiny, and can be colored or textured for aesthetic reasons.
2.Sandblasting
Sandblasting is often used on the nameplate of aluminum alloy materials for surface treatment. Sandblasting on the surface of aluminum alloy materials will result in a relatively soft surface finish and roughness. It will obtain a film light decoration or a surface effect with a slight reflective surface, which is often used as a background decoration for relief graphics.
3.Drawing
The aluminum alloy wire drawing process can clearly show each fine silk mark, so that the aluminum alloy has a fine hair shine in matte, and the product has both fashion and technology. The common wire drawing effects of aluminum alloys can be divided into straight wire drawing, random wire drawing and spiral wire drawing.
4.Embossing
The required texture is obtained on the surface of the aluminum alloy product through the pressing process.
Thirdly, the anodizing coloring process
The fresh oxide film obtained by anodizing aluminum and its alloys has a strong adsorption capacity. It can be made into various bright colors after a certain process. This can not only beautify the surface of aluminum products, but also increase the oxidation. Corrosion resistance of the membrane.
According to the different distribution of coloring matter and pigment in the oxide film, it can be divided into three types: natural hair color, electrolytic coloring method and dyeing method. Among them, the natural coloring method is to obtain the color of the oxide film while anodizing and electrolyzing; and the coloring and dyeing are performed after the anodized film is prepared.
Fourth, the surface plating
Surface plating can improve the effects of surface corrosion resistance and surface decoration of aluminum alloy materials. Because aluminum is a typical amphoteric metal, it will react violently when encountering acids and bases, making electroplating on aluminum parts much more difficult than plating on steel substrates, and some special treatments must be performed. Compared with anodizing and coloring of anodized aluminum alloy, the color of the plating layer is very limited. The plating layer is generally copper-nickel-chromium plating, wear-resistant, anti-corrosion, and general automotive, bathroom, lighting, furniture, etc. will choose electroplating. The current cost of decorative surface plating is relatively high.
The decorative electroplating of the surface of aluminum alloy materials mainly uses polished electrolytic oxidation colored copper plating, nickel, chromium, and other decorative coatings such as imitation gold.
Fifth, painting process
Roller coating is a kind of paint coating process, which uses a rubber roller or steel roller to apply paint on the surface of aluminum plate. The paint is leveled and arranged, and finally it is evenly transferred to the steel strip in motion before being carried out. Curing, thereby coating the organic solid protective film of steel molecules.
