The method of direct coating on the surface of mirror aluminum plate includes cleaning the surface of aluminum plate with water, dilute acid and alkali solution; after cleaning, the aluminum plate is vacuum coated with ceramic materials to form a film on the surface of aluminum plate.

The coating process of mirror aluminum plate is simple, less environmental pollution and low production cost, which is beneficial to large-scale industrial production. Clean the aluminum plate with water first, remove the dirty dirt on the surface of the aluminum plate, and then make the temperature of the aluminum plate within 40 ° C-45 ° C. clean the surface of the aluminum plate with dilute hydrochloric acid with a mass concentration of 3%, remove the corrosive layer, oil stain and other impurities on the surface, then clean the aluminum plate with a mass concentration of 15% sodium carbonate solution, and finally clean the acid and alkali solution remaining on the surface of the aluminum plate with water until the washing solution is neutral. After that, put it in a drying oven to dry.

Then take out the processed mirror aluminum plate, preheat it to 180 ° C, and then put it in the vacuum chamber for vacuum coating. The vacuum coating is a common evaporation coating, that is, when coating, place the evaporation source Si3N4 material on the crucible in the vacuum chamber, and place the mirror aluminum plate in the front of the crucible. After vacuuming in the vacuum chamber, heat the crucible with electron beam to evaporate the evaporation source Si3N4 material, and the atoms or molecules of the evaporated material are deposited on the aluminum plate in the front of the crucible, and the evaporation rate of the evaporation source It is 120-200m / min and the coating time is 30-40min. At the end of vacuum coating, the color mirror aluminum plate was obtained, and the thickness of the film formed on the surface of mirror aluminum plate was 5-15 PM.