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Hole sealing treatment method for aluminum and aluminum alloy anodized films

A technology of alloy anode and treatment method, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of fast fluoride ion consumption, difficulty in anodic oxidation film, water marks on the product surface, etc., and achieve sealing treatment The effect of low temperature, easy operation, and small natural ecological hazards

Active Publication Date: 2012-09-19
MITAC PRECISION TECH(KUNSHAN) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of these two sealing agents are that the fluoride ion used for sealing the pores consumes quickly and must be adjusted frequently, and because the application range of fluoride ions is narrow, it is difficult to adjust, resulting in good and bad sealing effects; sealing 20 Thick anodized film above micron is more difficult
[0005] When the calcium and magnesium salt sealing technology is used to seal the organic dyeing film, the color flow is serious, the film is easy to change color, and there are water marks on the surface of the product after drying.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Use an aqueous solution of water-based nano-coating N7111-3 with a mass concentration of 5% as the sealing solution, and immerse the anodized aluminum workpiece in the sealing solution for sealing treatment. The treatment temperature is 25°C and the treatment time is 20 seconds. , and then take out the aluminum workpiece and bake at 130° C. for 30 minutes.

[0020] The surface of the aluminum workpiece obtained does not have any "powder frost" and water marks. The neutral salt spray test for 96 hours shows that there is no any corrosion on the surface of the aluminum alloy workpiece. The storage test (environmental temperature is 50 ° C, relative humidity is 96% RH ) for 336 hours, there was no significant change on the surface of the aluminum workpiece.

Embodiment 2

[0022] The isobutanol solution of organosol gel N7111-1 with a mass concentration of 5% was used as the sealing liquid, and the anodized aluminum workpiece was immersed in the sealing liquid for sealing treatment. The treatment temperature was 20°C. The time is 20 seconds, and then the aluminum workpiece is taken out and baked at 120° C. for 30 minutes.

[0023] The surface of the aluminum workpiece obtained does not have any "powder frost" and water marks. The neutral salt spray test for 96 hours shows that there is no any corrosion on the surface of the aluminum alloy workpiece. The storage test (environmental temperature is 50 ° C, relative humidity is 96% RH ) for 336 hours, there was no significant change on the surface of the aluminum workpiece.

Embodiment 3

[0025] The aqueous solution of water-based nano-coating N7111-3 with a mass concentration of 20% was used as the sealing liquid, and the aluminum alloy workpiece that had been anodized and dyed was immersed in the sealing liquid for sealing treatment. The treatment temperature was 25°C. The time is 10 seconds, and then the aluminum alloy workpiece is taken out and baked at 150° C. for 30 minutes.

[0026] The surface of the obtained aluminum alloy workpiece does not have any "powder frost" and water marks, and the dyed anodic oxide film does not appear to flow or change color. The neutral salt spray test was performed for 96 hours, and the surface of the aluminum alloy workpiece did not show any corrosion. After 336 hours of storage test (environment temperature is 50° C., relative humidity is 96% RH), the surface of the aluminum alloy workpiece has no obvious change.

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Abstract

The invention provides a hole sealing treatment method for aluminum and aluminum alloy anodized films. The hole sealing treatment method for the aluminum and aluminum alloy anodized films is characterized by taking an aqueous solution of an aqueous nano-coating or an alcohol solution of organic sol gel as a hole sealing solution, and hole sealing treatment is performed on the aluminum and aluminum alloy anodized films according to the following specific process: soaking an anodized aluminum or aluminum alloy workpiece into the aqueous solution of the aqueous nano-coating or the alcohol solution of the organic sol gel for the hole sealing treatment, wherein the treatment temperature is 20-25 DEG C and the treatment time is 10-20 seconds; and then taking out and baking the aluminum alloy workpiece for 30 minutes at 110-150 DEG C. The hole sealing treatment method for the aluminum and aluminum alloy anodized films is simple in process, relatively low in energy consumption, and accordant with requirements on environmental protection; and after the hole sealing treatment on aluminum and aluminum alloy workpieces, the corrosion resistance of surfaces of the aluminum and aluminum alloy workpieces are relatively high, water marks are avoided and the dyeing treatment effect of the anodized films is not affected.

Description

【Technical field】 [0001] The invention relates to a surface treatment process of aluminum and its alloys, in particular to a method for sealing holes of anodized films of aluminum and its alloys. 【Background technique】 [0002] The sealing of aluminum and its alloy anodized film is to block the nano-scale pores on the surface by physical or chemical methods, thereby reducing the porosity and adsorption performance of the anodized film, and improving the hardness and corrosion resistance of the anodized film. At present, the sealing methods of aluminum and its alloy anodized film mainly include boiling water or high temperature steam sealing technology, nickel salt or cobalt salt sealing technology and calcium magnesium salt sealing technology. [0003] The principle of boiling water or high-temperature steam sealing technology is simple. The sealing process of the membrane is the hydration process of alumina. The operating temperature is the main controlling factor of the se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/18
Inventor 杨升攀陈其亮
Owner MITAC PRECISION TECH(KUNSHAN) CORP
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