A kind of sealing method of aluminum alloy anodized film

Abstract

The invention relates to the technical field of aluminum alloy surface treatment, and particularly relates to a sealing method of a 2xxx / 7xxx aluminum alloy anode oxidized film for aviation. The sealing method is characterized by comprising the following steps: coating inorganic substance powder, liquid and a ceramic raw material on the surface of an anode oxidized aluminum alloy, then performing microwave heating treatment, and finally performing hole sealing treatment in the form of a ceramic layer. The oxidized film holes have adsorption effect, and the ceramic coating paint has permeability, so that the paint easily permeates through the holes and is deposited at the film holes; when dried by heating, the coating paint starts to be polymerized; and finally, after the liquid is evaporated, a ceramic film is formed to perform hole sealing. Thus, the ceramic coating paint seals the holes of the oxidized film, and furthermore, a coating is formed on the surface of the oxidized film.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy surface treatment, in particular to a method for sealing anodic oxidation films of aviation 2-series and 7-series aluminum alloys. The process can effectively seal the pores of aluminum alloy anodic oxidation films and effectively reduce the pores of aluminum alloys. rate, improve its wear resistance, corrosion resistance and electrical insulation. Background technique [0002] Anodic oxidation is a commonly used surface treatment method for aluminum alloys. After anodized aluminum alloys, the oxide film formed has the characteristics of a porous structure, so the film layer has high porosity and adsorption, and is easy to be polluted and corroded; in order to enhance The corrosion resistance, anti-fouling and electrical insulation properties of the anodized film, in practical applications, the film layer must be sealed with appropriate sealing technology, so as to improve the wear resistan...

AI Technical Summary

Problems solved by technology

[0003] Common sealing techniques include boiling water sealing, dichromate sealing and nickel fluoride sealing; boiling water sealing is the earliest sealing technology used, but since boiling water sealing is mainly physical sealing, it is difficult to seal holes in strong acids and strong The extent of improving the corrosion resistance of anodic oxidation in an alkaline environment is limited. At the same time, the boiling water sealing method still has high energy consumption, limited protective performance of the membrane, easy to produce microcracks, decreased hardness and wear resistance, high requirements on water quality, and easy to produce Disadvantages such as powder frost; dichromate sealing is a sealing technology with better corrosion resistance of oxide film among various sealing methods, but there is a pollution of dichromate to the environment, and the film layer is colored after sealing and other problems; the disadvantage of nickel fluoride sealing is that the fluorine ion used for sealing the hole consumes quickly, and the fluorine ion content is high, which is difficult to control; it is difficult to seal the thicker anodic oxide film above 20 microns

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