5052 alloy aluminum plate is widely used because of its good decorative properties after electrolysis, especially in the building materials industry, its surface will be treated accordingly and widely used. According to the understanding of the aluminum plate manufacturer, the main process is electrolytic coloring with tin nickel mixed salt, and the color of the manufactured products is mainly champagne color, which is much brighter and fuller in color than monochrome coloring.
Among them, during the extrusion process, oxidation coloring will change to some extent, mainly due to the influence of die design, extrusion speed, extrusion temperature and cooling mode of 5052 alloy aluminum plate. The mold design should be able to fully blend the incoming materials, otherwise bright (dark) band defects are easy to occur, and color separation may occur on the same profile; At the same time, the die state and extrusion lines on the profile surface also affect the oxidation coloring. Extrusion temperature, speed, cooling mode and cooling time are different, resulting in uneven structure of profiles and color difference.
Anodic oxidation will have a great impact on the color difference of electrolytic coloring, especially in the production process of vertical oxidation line, it is easy to appear two colors. The vertical oxidation tank is 7.5m deep, and the temperature difference between the upper and lower tank liquids is easy to occur. Temperature has an important impact on anodic oxidation. When the temperature is high, the dissolution of the oxidation tank liquid to the oxide film is intensified, and the pore size of the porous anodic oxide film surface will increase. Conversely, the pore size of the porous anodic oxide film surface is smaller.
In addition, the higher the temperature, the higher the porosity of the anodic oxide film, the more intense the dissolution, and the larger the pore size of the anodic oxide film surface. Aluminum plate manufacturers understand that the main principle of electrolytic coloring is to make the metal ions in the coloring solution electrochemically reduce on the surface of the barrier layer in the micropores of the oxide film, so that the metal ions in the coloring solution are deposited at the bottom of the anodized film holes, scattering the incident light and showing different colors. The more materials deposited in the micropores, the darker the color.