The anodic oxidation dyeing process of aluminum parts is introduced

1. Dyeing monochrome method: at 4 o 'clock, the aluminum products that have been anodized and washed with water are immediately immersed in the coloring solution. 40-60℃. Soaking time: light 30 seconds to 3 minutes; Dark, black for 3-10 minutes. After dyeing, remove and wash with water. 2, dyeing multicolor method: if two or more different colors are dyed on the same aluminum sheet, or when printing scenery, flowers and birds, text and text, the procedure will be very complex, including coating masking method, direct printing and dyeing method, foam dyeing method, etc. The above methods operate differently, but the principle is the same. Now, the coating masking method is described as follows: The method mainly consists of thin and uniform coating of a fast-drying and easy-to-clean varnish on the really needed yellow to mask it. After the paint film is dry, immerse all aluminum parts in dilute chromic acid solution, remove the yellow color of the uncoated parts, rinse the acid solution with water, dry at low temperature, and then dye red. If you want to dye the third and fourth color, you can follow this method. 3. Seal: After the stained aluminum sheet is washed with water, it is immediately boiled in distilled water at 90-100℃ for 30 minutes. After this treatment, the surface becomes uniform and non-porous, forming a dense oxide film. The dye applied by coloring is deposited in the oxide film and can no longer be erased. The sealing oxide film is no longer adsorbent, and its wear resistance, heat resistance and insulation properties are enhanced. After sealing treatment, the surface of the aluminum parts is dried and polished with a soft cloth to obtain a beautiful and bright aluminum product, such as multi-color dyeing. After sealing treatment, the protective agent applied to the aluminum parts should be removed, small areas should be wiped with acetone dipped in cotton, and large areas can be dipped in acetone to wash off the paint. 1, aluminum parts after washing oil treatment, should be immediately oxidized, and should not be placed for too long. When aluminum parts are made into oxide films, they should all be immersed in the electrolyte, the battery voltage should be stable and consistent from beginning to end, and the same batch of products must be completely consistent, even when dyed. 2, during the anodizing process, aluminum, copper, iron, etc. in the electrolyte continue to increase, affecting the luster of aluminum. When the aluminum content is greater than 24g/l, the copper content is greater than 0.02g/l, and the iron content is greater than 2.5 o 'clock. 3, when purchasing raw materials and dyes, you should choose high-purity products, because when the general impurities are slightly more or mixed with anhydrous sodium sulfate and dextrin, the dyeing effect is not good. 4, when a large amount of dyeing, the dyeing solution will become lighter after the initial concentration, and the color after dyeing will show different tones. Therefore, attention should be paid to mixing slightly concentrated dye in time to maintain the consistency of the dye concentration as much as possible. 5. When dyeing a variety of colors, the light color should be dyed first, and then the dark color should be dyed with yellow, red, blue, brown and black in turn. Before dyeing the second color, the paint should be dry so that the paint is close to the aluminum surface, otherwise the dye will soak in and the burr border will not be clear. 6, impurities in aluminum affect dyeing: silicon content is more than 2.5%, the bottom film is gray, should be dyed dark. The magnesium content is greater than 2%, and the stain band is dull. Low in manganese, but not bright. The color of copper is dull, and if it contains too much iron, nickel, and chromium, the color is also dull.