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Self-repairing confining liquid and method for confining aluminium alloy anodic oxide film by using the same

A technology of anodic oxidation film and sealing solution, which is applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of short life of sealing solution, difficult control of hot water, generation of dirt, etc., and achieve stable sealing effect, Ease of control and cost savings

Inactive Publication Date: 2011-11-16
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Hot water often creates fouling on sealing surfaces, while hot water is difficult to control in large-scale production due to pH changes and contamination (e.g. phosphates, silicates, and chlorides), resulting in short sealing solution life
Hot water sealing takes a long time (2min / μm) and high energy consumption is the obvious disadvantage of hot water sealing

Method used

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  • Self-repairing confining liquid and method for confining aluminium alloy anodic oxide film by using the same
  • Self-repairing confining liquid and method for confining aluminium alloy anodic oxide film by using the same
  • Self-repairing confining liquid and method for confining aluminium alloy anodic oxide film by using the same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The first step: sample selection

[0040]The sample is a 2024-T3 bare aluminum plate treated according to the People's Republic of China Aviation Industry Standard "Sulfuric Acid Anodizing Process for Aluminum and Aluminum Alloys" (HB / Z233-93), with a size of 100mm×50mm×2.5mm;

[0041] The thickness of the anodized film on the surface of the 2024-T3 bare aluminum plate measured by a vortex thickness gauge is 3 μm. The morphology of the anodized film was observed by a field emission scanning electron microscope (Hitachi S-4800 SEM). figure 2 As shown in the figure, there are holes in the anodized film.

[0042] Step 2: Prepare self-healing sealing solution

[0043] The self-healing blocking solution is to dissolve 10g of ammonium adipate in 100ml of deionized water at a temperature of 25°C, and measure the pH value to 7.0 with a Swiss-made FE20 FiveEasy pH meter;

[0044] The third step: closed processing

[0045] (A) adding the self-repairing sealing solution prepa...

Embodiment 2

[0057] The first step: sample selection

[0058] The sample is a 7050-T7451 bare aluminum plate treated by boric acid-sulfuric acid anodizing process (U.S. Pat. No. 4,894, 127, Jan. 16, 1990), with a size of 100mm×50mm×2.5mm;

[0059] Step 2: Prepare self-healing sealing solution

[0060] The self-healing blocking solution is to dissolve 5g of ammonium adipate in 100ml of deionized water at a temperature of 40°C, and measure the pH value to 6.8 with a pH meter;

[0061] The third step: closed processing

[0062] (A) Add the environmentally friendly self-repairing sealing solution prepared in the second step into the stainless steel electrolytic cell, and the consumption of the self-repairing sealing solution is 2 / 3 of the volume of the electrolytic cell;

[0063] (B) heating the self-healing sealing solution to 100°C;

[0064] (C) The sample selected in the first step is completely immersed in the self-repairing sealing solution, and one end of the sample is connected to th...

Embodiment 3

[0069] The first step: sample selection

[0070] The sample is a 2214-T6 bare aluminum plate that has been treated according to the provisions of the Aviation Industry Standard of the People's Republic of China "Sulfuric Acid Anodizing Process for Aluminum and Aluminum Alloys" (HB / Z233-93), with a size of 100mm×50mm×2.5mm;

[0071] Step 2: Prepare self-healing sealing solution

[0072] The self-healing blocking solution is to dissolve 15g of ammonium adipate in 100ml of deionized water at a temperature of 30°C, and measure the pH value to 7.2 with a pH meter;

[0073] The third step: closed processing

[0074] (A) adding the self-repairing sealing solution prepared in the second step into the stainless steel electrolytic cell, the consumption of the self-repairing sealing solution is 2 / 3 of the volume of the electrolytic cell;

[0075] (B) Heating the self-healing sealing solution to 90°C;

[0076] (C) The sample selected in the first step is completely immersed in the self...

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Abstract

The invention discloses a self-repairing confining liquid and a method for confining an aluminium alloy anodic oxide film by using the same. The self-repairing confining liquid is formed by dissolving 5g-15g of ammonium adipate in 100ml of deionized water. The confining method is to carry out confining treatment on anodized aluminium alloy under the action of an electric field. The confining method confines the micropores of the oxide film, and in the anodic oxide process, since holes caused by the fusion and the dropping of second-phase particles are filled and repaired, a confining bed witha net structure is formed on the surface so that the confined aluminium alloy anodic oxide film has the self-repairing capacity and higher decay resistance.

Description

technical field [0001] The invention relates to a sealing technology suitable for aluminum alloy anodic oxidation film, in particular to a self-repairing sealing liquid and a method for sealing the aluminum alloy anodic oxidation film with it. Background technique [0002] Anodic oxidation is the most commonly used surface treatment method for aluminum and aluminum alloys. Porous anodized films will be formed on the surface of aluminum and aluminum alloys after anodization. Composed of two parts. Although this porous characteristic endows the anodized film with the ability to color and other functions, it is impossible to meet the requirements for corrosion resistance, weather resistance, and pollution resistance. Therefore, considering practical application, the anodized film of aluminum and aluminum alloy must be sealed. [0003] The aviation industry standard of the People's Republic of China "Sulfuric Acid Anodizing Process of Aluminum and Aluminum Alloys" (HB / Z 233-93...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/18
Inventor 刘建华李永星李松梅于美李明陈高红
Owner BEIHANG UNIV
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