Mirror aluminum surface direct coating method

【CHINA ALUMINUM INDUSTRY NETWORK】The present invention relates to a method for directly coating a mirror aluminum surface, which belongs to the technical field of aluminum and its alloys. The method comprises the steps of: washing the surface of the aluminum plate with water, dilute acid and alkaline solution; the cleaned aluminum plate is vacuum coated with a ceramic material to form a thin film on the surface of the aluminum plate. The ceramic material is Si3N4, Ti3N4, which is manufactured by the method of the present invention. Mirror aluminum, the film layer formed on the surface is not only diverse in color, good in appearance, corrosion resistance, abrasion resistance, and scratch resistance; but also the method is simple in technology, less in environmental pollution, and low in production cost, which is favorable for large-scale industrial production.

A method for direct film coating on a surface of a mirror aluminum, which comprises cleaning the surface of the aluminum plate with water, a dilute acid, and a lye; and the aluminum plate after cleaning is vacuum coated with a ceramic material to form a thin film on the surface of the aluminum plate.

2. The method of claim 1, wherein the dilute acid is a dilute hydrochloric acid with a mass fraction of 1%-5%, a dilute nitric acid content is 1%-5%, and the mass fraction is One of 1%-5% dilute sulfuric acid, and the alkali solution is an inorganic alkali solution.

The method for directly coating a mirror aluminum surface according to claim 1 or 2, wherein the ceramic material is one or two of Si3N4 and Ti3N4.

The method for directly coating a mirror aluminum surface according to claim 1 or 2, wherein the thickness of the thin film formed on the surface of the aluminum plate after the vacuum coating is 5 to 15 μm.

5. The method for directly coating a mirror surface aluminum surface according to claim 3, wherein the thickness of the thin film formed on the surface of the aluminum plate after the vacuum deposition is 5 to 15 μm.

FIELD OF THE INVENTION [0001] The present invention relates to a method for coating a surface of an aluminum surface, and more particularly to a method for directly coating a surface of an aluminum mirror surface, and belongs to the technical field of aluminum and alloys thereof.

BACKGROUND OF THE INVENTION [0002] Aluminum and its alloys are light metal materials, have advantages of small density, strong electrical and thermal conductivity, excellent mechanical properties, secondary processing, etc., and therefore have been widely used in industrial production.

[0003] Since light metals such as aluminum and its alloys are an easily corrodible material, the surface is usually treated to reduce its corrosion. The prior art mainly uses chemical conversion treatment and anodization and other surface treatment methods. After surface treatment of aluminum and its alloy materials, although it has improved corrosion resistance and wear resistance to some extent, due to chemical treatment or anodizing treatment, the metal surface is rough and lacks in appearance. In order to solve these problems, aluminum and its alloy materials are usually surface-treated and then colored on their surfaces to increase the surface aesthetics of aluminum and its alloy materials.

[0004] China Patent Application (Publication No.: CN101381871A) discloses a method for preparing mirror aluminum, which first uses an aluminum substrate at a temperature of 50 to 70° C. with a dilute acid having a concentration of 5% to 8%. Cleaning, drying at 100 °C ~ 110 °C, coating the surface of the dried substrate with a scale inhibitor, drying in an oven, and drying the substrate in a dust-free environment The surface is sprayed with UV-curing paint as a primer, leveled, placed in a 40-60 °C UV curing oven at 4 to 6kw with strong UV radiation for 25 to 35 seconds, and the cured substrate is allowed to conduct for 8 to 15 minutes. Vacuum coating, a mirror panel with a single color is obtained, and the above-mentioned single-color mirror panel is sprayed with a UV-curing paint as a surface paint in a dust-free environment, and is leveled and placed in an ultraviolet curing oven at 40-60° C. 4 ~ 6kw strong UV radiation curing 25 ~ 35 seconds, to obtain a colored mirror aluminum. The disadvantage of this method is that the production method requires two coatings to obtain a colored mirror aluminum, and the Ti addition process is complicated and the cost is high; and the coloring material paint contains volatile and harmful substances such as benzene and toluene, which affects the environment and harms the human body. effect.

SUMMARY OF THE INVENTION [0005] The present invention addresses the disadvantages of the prior art, and proposes a direct coating method for a mirror aluminum surface with a simple preparation method, a low production cost, a variety of colors, and a good appearance.

[0006] The above object of the present invention can be achieved through the following technical solutions: A method for direct film coating on a mirror aluminum surface, which comprises cleaning the surface of the aluminum plate with water, dilute acid, alkali solution; and the cleaned aluminum plate is coated with a ceramic material for vacuum coating A thin film is formed on the surface of the aluminum plate.

[0007] As the aluminum plate is easily exposed to air corrosion of the aluminum plate, the surface of the corrosion layer is not only dull color, affecting the aesthetics, but also affect the subsequent coating process. Water, dilute acid, alkali solution can be used to remove the aluminum oxide film on the surface of the aluminum plate to facilitate the subsequent coating process.

[0008] The common vacuum coating method used in the prior art of the present invention means that the coating material is evaporated or sputter-coated under a vacuum condition so that it is deposited on the surface of the substrate to be coated. For example, an ordinary vacuum evaporation coating method is used, but the vacuum coating material used in the present invention uses a ceramic material, and the surface color of the coating is various, so that the aluminum plate forms a mirror aluminum with high corrosion resistance and wear resistance, and the vacuum coating time is 10-80 minutes. .

[0009] In the above method of direct coating of aluminum on a mirror surface, the dilute acid is a dilute hydrochloric acid with a mass fraction of 1%-5%, a dilute nitric acid with a mass fraction of 1%-5%, and a dilute content of 1%-5%. One of sulfuric acid, the alkali solution is an inorganic alkali solution. The invention adopts dilute acid treatment instead of high-concentration acid treatment because it is treated with high-concentration acid, it is easy to cause passivation reaction on the surface of metal such as aluminum, and the effect of treatment cannot be achieved. Further preferably, the dilute acid is a dilute hydrochloric acid having a mass fraction of 1% to 5%, and the alkaline solution is one of a 1-5% sodium hydroxide solution or a 10-20% sodium carbonate solution.

[0010] In the above method for directly coating a mirror surface aluminum surface, the ceramic material is one or two of Si3N4 and Ti3N4. The ceramic materials Si3N4 and Ti3N4 used in the present invention are highly heat-resistant, acid-resistant, and highly wear-resistant materials, so using Si3N4 and Ti3N4 as materials can effectively improve the wear resistance and corrosion resistance of the mirror aluminum. At the same time, after the vacuum coating, the surface of the mirror aluminum obtained is smooth, smooth, and the color of the coating is various, and different colors of mirror aluminum can be obtained according to actual needs.

[0011] In the above method of directly plating the aluminum surface of the mirror surface, the thickness of the thin film formed on the surface of the aluminum plate after the vacuum deposition is 5 to 15 μm.

In summary, the present invention has the following advantages:

[0013] 1. The direct film coating method of the present invention has a simple process, less environmental pollution, and low production cost, and is beneficial to large-scale industrial production.

[0014] 2. The film layer formed on the surface of the mirror aluminum by the direct film coating method of the present invention not only has various colors and good appearance, but also has excellent corrosion resistance, wear resistance, and scratch resistance after the direct coating of mirror aluminum. The advantages.

Specific embodiments [0015] The following specific embodiments, the technical solution of the present invention will be further specifically described; but the present invention is not limited to these embodiments.

Example 1

[0017] The aluminum plate first washed with water, washed away the dirt on the surface of the aluminum plate, washed, and then the temperature of the aluminum plate in the 40 °C ~ 45 °C, with a concentration of 3% diluted hydrochloric acid cleaning the surface of the aluminum plate, Remove impurities such as corrosion layer and oil stain on the surface, then wash the aluminum plate with a 15% sodium carbonate solution, and then wash the acid and alkali solution remaining on the surface of the aluminum plate with water, clean it until the lotion is neutral, and then dry it. Dry in the box.

[0018] After the above pretreated aluminum plate is taken out, preheated to 180° C., and then placed in a vacuum chamber for vacuum coating treatment. The vacuum coating is an ordinary evaporation coating. When the coating is applied, the evaporation source Ti3N4 material is placed on a crucible in a vacuum chamber, and the aluminum plate is placed in front of the crucible. After the vacuum is evacuated, the electron beam is used to heat the crucible. The evaporation source Ti3N4 material evaporates, and the evaporated material atoms or molecules are deposited on the aluminum plate in front of the crucible. The evaporation rate of the evaporation source is 120-200 m/min and the coating time is 20-30 minutes. After the vacuum coating is finished, a colored mirror aluminum is obtained, and the thickness of the thin film formed on the surface of the mirror aluminum is 5 to 15 μm.

Example 2

[0020] The aluminum plate is first washed with water, the dirt on the surface of the aluminum plate is washed off, and the aluminum plate is washed at room temperature with dilute hydrochloric acid with a concentration of 5% to remove impurities such as corrosion layer and oil stain on the surface. Then, the aluminum plate is washed with a 3% sodium hydroxide solution, and the acid and alkali remaining on the surface of the aluminum plate are washed with water, washed until the lotion is neutral, and dried in a drying oven.

[0021] The pre-prepared aluminum plate is taken out, preheated to 180° C., and then placed in a vacuum chamber for vacuum coating treatment. The vacuum coating is an ordinary evaporation coating, ie when coating, the evaporation source Si3N4 material is placed on a crucible in a vacuum chamber, and the aluminum plate is placed in front of the crucible, and the vacuum chamber is evacuated and then heated by an electron beam. The evaporation source Si3N4 material evaporates, and the evaporated material atoms or molecules are deposited on the aluminum plate in front of the crucible. The evaporation source evaporation rate is 120-200 m/min and the coating time is 30-40 minutes. After the vacuum coating is finished, a colored mirror aluminum is obtained, and the thickness of the thin film formed on the surface of the mirror aluminum is 5 to 15 μm.

[0022] The specific embodiments described in the present invention are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains may make various modifications or additions to the described embodiments or substitute similar ones without departing from the spirit of the present invention or beyond the scope of the appended claims. The range.

Although the present invention has been described in detail and cited with reference to specific embodiments, it will be apparent to those skilled in the art that various changes or modifications may be made without departing from the spirit and scope of the present invention.

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