The electrolytic coloring of 5052 aluminum plate has a good decorative effect, so it has been widely used at home and abroad, especially in the surface treatment of building aluminum profiles. At present, the main process is electrolytic coloring with tin nickel mixed salt, and the product color is mainly champagne color. Compared with single nickel salt coloring, the product color of electrolytic coloring with tin nickel mixed salt is bright and full; the main problem is product color difference, which will be caused by aluminum extrusion process and oxidation coloring process of aluminum plate manufacturer in the production process.
The influence of extrusion process on oxide coloring is mainly the influence of die design, extrusion temperature, extrusion speed and cooling mode on the surface state and microstructure uniformity of extruded profiles. In the design of the die, the feed should be kneaded sufficiently, otherwise the bright (dark) band defects will appear easily, and the color difference may appear in the same section; at the same time, the die state and extrusion line on the surface of the profile will also affect the oxidation coloring of the profile.
Different extrusion temperature, speed, cooling mode and cooling time make the structure of profile uneven, and also produce color difference. The color difference of anodizing electrolytic coloring has an important influence, especially the two colors that are easy to appear in the process of vertical oxidation production line. The depth of vertical oxidation ditch is 7.5m, and the temperature difference between bath and bath is easy to occur. Temperature has an important influence on anodizing. High temperature and liquid oxidation tank improve the dissolution of oxidation film, and the pore diameter of anodizing film on the surface of multiple tanks increases. On the contrary, the surface of anodizing film Many grooves on the surface have smaller apertures. In addition, high temperature will increase the porosity of anodized film, and vice versa.
Electrolytic coloring is mainly to make the colored liquid metal ions in the microporous barrier on the surface of the oxide film electrochemical reduction reaction, so that the nonferrous liquid deposition metal ions on the bottom of the anode oxide film hole incident light scattering and display different colors, the more microporous materials deposited, the deeper the color. Under the same electricity condition, the same amount of metals or metal compounds are deposited at high and low temperature. For the parts with high porosity and large surface aperture, the average sediment concentration of each pore is small.
Therefore, the color of 5052 aluminum plate is relatively light, while the color is relatively dark, resulting in the color of both ends of the colored material. In the anodizing process of 5052 aluminum plate, the conductivity of the oxide film will also cause color difference of the color material. The main problem is that it is easy to appear on the horizontal line, mainly because the blank in front of the anodizing process is not tightly clamped, resulting in poor personal conductive material, making its relatively different oxide film, which will produce color difference after dyeing.
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