What is the point solution coloring of 5052 alloy aluminum sheet

Oct 08, 2021

5052 alloy aluminum sheet has been widely used for its good decoration after electrolysis, especially in the building materials industry, it will be widely used for corresponding treatment of its surface. According to the understanding of aluminum plate manufacturers, its main process is to use tin-nickel mixed salt electrolytic coloring, while the color of the manufactured products is mainly champagne, which is relative to monochrome coloring, the color of the product should be much brighter, and the tone is more full.

During the extrusion process, oxidation coloring will have certain changes, mainly due to the influence of mold design, extrusion speed, 5052 alloy aluminum sheet extrusion temperature and cooling mode, etc. The mold design should make the feed fully kneaded, otherwise it is easy to appear bright (dark) with defects, 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 oxidation coloring. Different extrusion temperature, speed, cooling method and cooling time make the profile structure uneven and also produce chromatic aberration.

Anodic oxidation will have a great influence on the color difference of electrolytic coloring, especially in the production process of vertical oxidation line, it is easy to have two colors, vertical oxidation tank deep 7.5m, the temperature difference between the upper and lower tank liquid is easy to occur, and the temperature has an important influence on Anode Oxidation. The temperature is high, and the dissolution of the oxide film by oxidation tank liquid is intensified, and the aperture on the surface of the porous anodic oxide film plus-sized. Conversely, the aperture on the surface of porous anodic oxide film is small.

When the temperature is higher, the porosity of the anodic oxide film is higher, the dissolution is more severe, and the aperture of the surface of the anodic oxide film is also larger. Aluminum plate manufacturers have learned that the main principle of electrolytic coloring is to make the metal ions of the coloring solution carry out electrochemical reduction reaction on the surface of the barrier layer in the micropores of the oxide film, the metal ions in the coloring solution are deposited at the bottom of the anode oxide film hole, scattering the incident light and showing different colors. The more materials deposited in the micropores, the darker the color.