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Anticorrosive sealing liquid and method for sealing anodic oxide film containing copper-aluminium alloy by utilizing same

A technology of anodic oxidation film and copper-aluminum alloy, applied in 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 , easy to control, cost-saving effect

Inactive Publication Date: 2010-08-04
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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  • Anticorrosive sealing liquid and method for sealing anodic oxide film containing copper-aluminium alloy by utilizing same
  • Anticorrosive sealing liquid and method for sealing anodic oxide film containing copper-aluminium alloy by utilizing same
  • Anticorrosive sealing liquid and method for sealing anodic oxide film containing copper-aluminium alloy by utilizing same

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Experimental program
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Effect test

Embodiment 1

[0039] The first step: sample selection

[0040]The sample is the LY11 alloy 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 LY11 alloy measured by a vortex thickness gauge is 3 μm. The morphology of the anodized film was observed with a 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 corrosion inhibiting sealing solution

[0043] The corrosion inhibition blocking solution is to dissolve 10g of ammonium adipate and 10μg of 2-mercaptobenzothiazole in 100ml of deionized water at a temperature of 25°C, and measure the pH value with the FE20 model FiveEasy pH meter produced in Switzerland. 7.0;

[0044] The third step: closed processing

[0045] (A) Add the corrosion-inh...

Embodiment 2

[0055] The first step: sample selection

[0056] The sample is LC5 alloy 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;

[0057] Step 2: Prepare corrosion inhibiting sealing solution

[0058] The corrosion-inhibiting blocking solution is to dissolve 5 g of ammonium adipate and 50 μg of benzotriazole in 100 ml of deionized water at a temperature of 40° C., and measure the pH value to 6.8 with a pH meter;

[0059] The third step: closed processing

[0060] (A) Add the environment-friendly corrosion-inhibiting sealing solution prepared in the second step into the stainless steel electrolytic cell, and the consumption of the corrosion-inhibiting sealing solution is 2 / 3 of the volume of the electrolytic cell;

[0061] (B) heating the corrosion inhibiting sealing solution to 100°C;

[0062] (C) The sample selected in the first step is completely immersed in the corrosion-inhibiting sealing solution...

Embodiment 3

[0066] The first step: sample selection

[0067] The sample is LY17 alloy 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;

[0068] Step 2: Prepare corrosion inhibiting sealing solution

[0069] The corrosion inhibition sealing solution is to dissolve 15g of ammonium adipate and 45 μg of quinaldicic acid in 100ml of deionized water at a temperature of 30°C, and measure the pH value to 7.2 with a pH meter;

[0070] The third step: closed processing

[0071] (A) Add the corrosion-inhibiting sealing solution prepared in the second step into the stainless steel electrolytic cell, and the consumption of the corrosion-inhibiting sealing solution is 2 / 3 of the volume of the electrolytic cell;

[0072] (B) heating the corrosion inhibiting sealing solution to 90°C;

[0073] (C) The sample selected in the first step is completely immersed in ...

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Abstract

The invention discloses anticorrosive sealing liquid and a method for sealing an anodic oxide film containing a copper-aluminium alloy by utilizing the same. The anticorrosive sealing liquid is prepared by dissolving 5-15g of adipate and 10-100mu g of anticorrosive in 100ml of deionized water. The anticorrosive is 2-mercaptobenzothiazole, benzotriazole, salicylaldoxime, 8-hydroxyquinoline or quinaldic acid. The sealing method is characterized by sealing the anodized copper-aluminium alloy in the electric field. By the sealing method, not only the micropores of the anodic oxide film are sealed, but also the anticorrosive is adsorbed in the anodic oxide film in the applied electric field, when the anodic oxide film is corroded, the anticorrosive is released from the micropores of the anodic oxide film through capillarity to play a role of corrosion inhibition to the copper-bearing phases in the base materials containing the copper-aluminium alloys to prevent further corrosion.

Description

technical field [0001] The invention relates to a sealing technology suitable for copper-containing aluminum alloy anodic oxidation film, in particular to a corrosion-inhibiting sealing liquid and a method for sealing the copper-containing aluminum alloy anodic oxidation film. 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...

Claims

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Application Information

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IPC IPC(8): C25D11/18
Inventor 刘建华李永星于美李松梅李英东李明
Owner BEIHANG UNIV
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