When the aluminum alloy is extruded, it is surface corrosion resistance not stable, so a type of surface treatment of anodizing can increase corrosion resistance, wear-resistance, and appearance of the extruded aluminum profiles. The anodized aluminum colors can be bright anodizing and color anodizing (dyed anodizing).
The anodizing process below can make you a great understanding of anodizing aluminum.
▸Surface pretreatment: The surface of the extruded aluminum is cleaned by chemical or physical means to expose a pure matrix to facilitate the obtaining of a complete and dense artificial oxide film. It is also possible to get a specular or matt (matte) surface by mechanical methods.
▸Anodizing: After surface pretreatment, under certain process conditions, the surface of the aluminum profile is anodized to form a dense, porous, strong adsorption AL203 film.
▸Sealing: The pores of the porous oxide film formed by anodization are closed so that the oxide film is prevented from being contaminated, and the corrosion resistance and wear resistance are enhanced. The oxide film is colorless and transparent. Metal salts are deposited in the pores of the film; the appearance of the profile shows many colors other than natural color.
What is Clear Anodizing? How does it look?
Clear anodizing can also be referred to as regular silver anodizing. The use of clear anodizing in the surface treatment of aluminum alloys accounts for 80%, and most industrial aluminum materials prefer to clear anodizing surface finishing. It has a bit of natural aluminum, elegant and beautiful, corrosion resistance while taking into account the advantages of lower cost.
What is Color Anodizing? What color can it be?
Color anodizing can also be referred to as dyed anodizing. It is with a wide range of colors, which has excellent decorative performance for aluminum products. This anodizing colors can be black, bronze, champagne, brown, yellow, green, purple, red, blue, gold, etc. Most aluminum products for consumer usage prefer to these decorative anodizing colors.
What Textures Can Be Chosen For The Anodized Aluminum Extrusions?
The smooth texture is the most regular one for both clear anodizing and color anodizing.
MECHANICAL FINISHING
If the aluminum extrusion profiles need to be anodized, we strongly suggest doing any mechanical finishing first. The tooling mechanical lines can be seen clearly on an anodized finish, and the anodized finish is easy to be scratched, especially for black anodized aluminum profiles. Mechanical finishes can improve and solve these defects and imperfections. Mechanical finishes are achieved by some methods, like sandblasting, brushing, or polishing.
- Sandblasting
The sandblasting process can clear and roughen the aluminum surface by the high-speed sand flow. It can improve the fatigue resistance of the aluminum surface, and increase the adhesive force between aluminum and anodizing film. This finish is used in many anodized aluminum extrusion products. The sandblasting anodized finish is like below.
- Polishing
A polished finishing can be achieved by mechanical grinding and chemical polishing. This process can reduce the roughness of the aluminum extrusion surface, and bring a bright and smooth surface.
RELATED REFERENCE: Know more about polishing anodized aluminum profiles.
- Brushing
The brushing process can produce lines texture on aluminum extrusion surface, and this finish is commonly used in picture frames, shower enclosures, and other aluminum extrusion products. The brushing anodized finish is like below.
Welcome your contact on our anodizing aluminum extrusion profiles for your required anodized colors.