Introduction of Dyeing Process of Aluminum Anodized Film
Aluminum anodizing
An electrolytic oxidation process in which the surface of aluminum is usually transformed into an oxide film that has protective, decorative, and other functional properties.
Aluminum packaging materials are often used in cosmetic lipstick packaging, perfume bottle packaging, accessory caps or lotion/spray pumps, eye cream massage heads. . .
The role of anodizing:
1. Increase the corrosion resistance of aluminum parts and the passivation of the oxide film, which can prevent further oxidation of the surface of aluminum parts, thus playing a protective role.
2. Increase the hardness of aluminum parts, the hardness of the oxide film is 3 times that of pure aluminum, and at the same time increase the wear resistance of aluminum parts.
3. Easy to color, the sulfuric acid oxide film is porous, and it is easy for the dyeing liquid to penetrate into the film pores to have chemical or physical effects, and dye it into various bright colors.
The principle of aluminum anodized film dyeing
Due to the high porosity and strong adsorption capacity of the anodized film, it is easy to dye. The dyeing method is to immerse the anodized aluminum workpiece in a solution containing dye immediately after cleaning, and the pores of the oxide film are dyed with various colors due to the adsorption of the dye.
Because of this method, the color is fast, the color is bright, and the operation is simple; after dyeing, the dye can be firmly attached to the membrane pores, which improves the anti-corrosion ability and anti-fouling ability of the membrane layer, and can maintain a beautiful color. Therefore, the dyeing method has been rapidly developed and widely used.
Anodized film color
The color of an object is determined by the wavelength of light incident on the object that is reflected, so it varies depending on the light incident on the object, the surface state of the object, and the discernment of the observer.
The aluminum anodic oxide film itself is transparent, and the incident light is not only reflected on the surface of the anodic oxide film, but also can improve the reflection of the anodic oxide film on the surface of the aluminum substrate, and become complex light entering the eyes of the observer.
There are also directional concavo-convex phenomena on the surface of aluminum after stamping. And because the incident direction and viewing angle of the incident light are different, its color will also change.
(1) The brightness and haze of the product surface are different. When the same dye is used, different visual effects will be exhibited on the product surface.
(2) After the oxide film is formed, it can be colored according to the different needs of customers for the color of the product.
The columnar pores of the oxide film are easy to absorb dye molecules, which can significantly change and improve the appearance and performance of aluminum products, and further improve the decorative and protective effects of aluminum products. Anodizing Colors In addition to white and gradient colors, PANTONE® can be produced in all colors.
