The furniture of electrolytic coloring aluminum alloy plate factory has good decorative performance, so it is widely used at home and abroad, especially in the surface treatment of building aluminum profiles. At present, the main process is electrolytic coloring of tin nickel mixed salt. The product color is mainly champagne. Compared with single nickel salt, the electrolytic coloring of tin nickel mixed salt is bright and full. The main problem is that the product has color difference. In the production process of aluminum profile, unreasonable extrusion technology and oxidation coloring technology will lead to product color difference.
The influence of extrusion process on the oxidation coloring of aluminum alloy plate is mainly the influence of die design, extrusion temperature, extrusion speed and cooling mode on the surface state and microstructure uniformity of extruded profiles. The die design shall be able to fully roll the feed, otherwise bright (dark) band defects may occur easily, and separation may occur on the same profile; at the same time, the die state and extruded particles on the profile surface will also affect the oxidation coloring of the profile. Extrusion temperature, speed, cooling mode and cooling time, etc., make the profile uneven, and also produce color difference.
The color difference of anodized aluminum alloy electrolytic coloring of aluminum plate manufacturers has a very important influence, especially in the process of vertical oxidation production line, two colors are easy to appear, the depth of vertical oxidation ditch is 7.5m, the temperature difference between bath and anodizing is easy to occur, the temperature has an important impact on anodizing, high temperature and liquid oxidation tank improve the dissolution of oxide film, On the contrary, the more grooves on the surface of anodized film, the smaller the pore size. In addition, the porosity of anodized film is higher at high temperature and lower at low temperature.
Electrolytic colouring of aluminum alloy is mainly to make the ions of colored liquid metal react with electrochemical reduction in the microporous barrier layer on the surface of the oxide film, which makes the incident light scattering and display different colors on the bottom of the anode oxide film hole by the metal ions deposited in the nonferrous liquid. The more microporous materials are deposited, the deeper the color is. 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 lighter and darker, resulting in color on both ends of the colored material. In the anodizing process of aluminum alloy manufacturers, the conductivity of oxide film will also lead to color difference of materials. The color problem is that the main horizontal line is easy to appear, mainly because the blank in front of the oxidation process is not tightly clamped, resulting in poor personal conductive materials, making its relatively different oxide film, which will produce color difference after dyeing.
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