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　　The present invention relates to a method for directly coating a mirror aluminum surface (the term "coating" is provided by an industry encyclopedia), belonging to the technical field of aluminum and its alloys. The method includes cleaning the surface of the aluminum plate with water, dilute acid, and alkaline solution; The cleaned aluminum plate is vacuum coated with ceramic material to form a thin film on the surface of the aluminum plate. The ceramic material is Si3N4, and Ti3N4 is made of mirror aluminum using the method of the present invention. The thin film layer formed on the surface is not only colorful and aesthetically pleasing, but also corrosion-resistant, wear-resistant, and defect resistant; Moreover, this method has a simple process, minimal environmental pollution, and low production costs, which is conducive to large-scale industrial production.

　　1. A direct coating method for mirror aluminum surface, comprising cleaning the aluminum plate surface with water, dilute acid, or alkaline solution; The cleaned aluminum plate is vacuum coated with ceramic material to form a thin film on the surface of the aluminum plate.

　　2. The direct coating method for mirror aluminum surface according to claim 1, characterized in that the dilute acid is one of 1% -5% dilute hydrochloric acid, 1% -5% dilute nitric acid, and 1% -5% dilute sulfuric acid, and the alkaline solution is an inorganic alkaline solution.

　　3. The direct coating method for mirror aluminum surface according to claim 1 or 2, characterized in that the ceramic material is one or two of Si3N4 and Ti3N4.

　　4. The direct coating method for mirror aluminum surface according to claim 1 or 2, characterized in that a thin film with a thickness of 5-15ym is formed on the surface of the aluminum plate after vacuum coating.

　　5. The direct coating method for mirror aluminum surface according to claim 3, characterized in that a thin film with a thickness of 5-15ym is formed on the surface of the aluminum plate after vacuum coating.

A direct coating method for mirror aluminum surface

technical field

　　The present invention relates to a method for coating aluminum surfaces, particularly to a direct coating method for mirror aluminum surfaces, belonging to the technical field of aluminum and its alloys.

Background technology

　　Aluminum and its alloys are lightweight metal materials with advantages such as low density, strong electrical and thermal conductivity, excellent mechanical properties, and the ability for secondary processing. Therefore, they have been widely used in industrial production.

　　Due to the fact that light metals such as aluminum and its alloys are easily corroded materials, surface treatment is usually carried out to reduce their corrosion. The existing technology mainly adopts surface treatment methods such as chemical conversion treatment and anodizing. After surface treatment, aluminum and its alloy materials have improved their corrosion resistance and wear resistance to a certain extent. However, due to chemical treatment or anodizing treatment, the metal surface becomes rough and lacks aesthetics. To address these issues, aluminum and its alloy materials are typically surface treated and then colored to enhance their surface aesthetics.

　　The Chinese patent application (publication number: CN101381871A) discloses a method for preparing mirror aluminum, which involves first heating the aluminum substrate at a temperature of 50-70 ° C; Under C, clean with dilute acid with a concentration of 5% -8% at 100 ° C; C－110° Under the condition of C, dry; Apply scale and corrosion inhibitors to the surface of the dried substrate, and then dry it in an oven; Then spray UV cured paint as a primer on the surface of the dried substrate in a dust-free environment, level it, and place it at 40-60 ° C; Cure in a UV curing oven with 4-6 kW of strong UV radiation for 25-35 seconds; Can the cured substrate be further processed for 8 hours? 15 minutes of vacuum coating to obtain a mirror panel with a single color. Finally, the surface of the mirror panel with a single color is sprayed with UV curable paint as a topcoat in a dust-free environment, leveled, and placed at 40-60 ° C; C's ultraviolet curing oven is irradiated with strong ultraviolet light of 4-6kw for 25-35 seconds to obtain colored mirror aluminum. The disadvantage of this method is that it requires two coatings to obtain colored mirror aluminum, and the process of adding Ti is complex and costly; And the coloring material paint contains volatile harmful substances such as benzene and toluene, which affect the environment and have harmful effects on human health.