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Anodizing method improving protection performance of aluminum and aluminum alloy

A protective performance and anodizing technology, applied in anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., can solve problems such as waste of energy, environmental pollution, and large washing wastewater

Active Publication Date: 2016-04-06
AVIC BEIJING INST OF AERONAUTICAL MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only contains hexavalent chromium, but also produces a large amount of flushing wastewater, which has serious pollution to the environment.
In addition, the process must be heated to above 90°C, which not only wastes energy, but also produces a large amount of waste gas containing chromium

Method used

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  • Anodizing method improving protection performance of aluminum and aluminum alloy
  • Anodizing method improving protection performance of aluminum and aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Adopt the process of anodizing method of the present invention as follows:

[0018] 1. The test material is 2024 bare aluminum plate, the heat treatment system is T3, and the size is 75mm×150mm×2mm;

[0019] 2. Immerse aluminum and aluminum alloy samples in acetone, ultrasonically degrease for 8 minutes, take them out and dry them with hot air at 50°C;

[0020] 3. Hang the aluminum and aluminum alloy samples on the aluminum alloy hanger;

[0021] 4. Put the aluminum and aluminum alloy samples in a 50g / L cleaning agent solution to degrease the surface of the sample, degreasing in the cleaning agent at 60°C for no less than 10 minutes; wash the sample with running water after degreasing;

[0022] 5. Deoxidize the aluminum and aluminum alloy samples at 25°C. The deoxidation time is 3 minutes. After taking it out, clean the surface of the sample with deionized water; the chromic anhydride (CrO 3 ) concentration is 45g / L, nitric acid (HNO 3 , ρ=1.42g / mL) concentration is ...

Embodiment 2

[0027] The process of anodizing method is as follows:

[0028] 1. The test material is 7075 bare aluminum plate, the heat treatment system is T6, and the size is 75mm×150mm×2mm;

[0029] 2. Immerse aluminum and aluminum alloy samples in acetone, ultrasonically degrease for 8 minutes, take them out and dry them with hot air at 50°C;

[0030] 3. Hang the aluminum and aluminum alloy samples on the aluminum alloy hanger;

[0031] 4. Put the aluminum and aluminum alloy samples in a 50g / L cleaning agent solution to degrease the surface of the sample, degreasing in the cleaning agent at 60°C for no less than 10 minutes; wash the sample with running water after degreasing;

[0032] 5. Deoxidize the aluminum and aluminum alloy samples at 25°C. The deoxidation time is 3 minutes. After taking it out, clean the surface of the sample with deionized water; the deoxidation solution is chromic anhydride (CrO 3 ) concentration is 45g / L, nitric acid (HNO 3 , ρ=1.42g / mL) concentration is 100g...

Embodiment 3

[0037] The process of anodizing method is as follows:

[0038] 1. The test material is 2024 aluminum plate, the heat treatment system is T3, and the size is 75mm×150mm×1.5mm;

[0039] 2. Immerse aluminum and aluminum alloy samples in acetone, ultrasonically degrease for 8 minutes, take them out and dry them with hot air at 50°C;

[0040] 3. Hang the aluminum and aluminum alloy samples on the aluminum alloy hanger;

[0041] 4. Put the aluminum and aluminum alloy samples in a 50g / L cleaning agent solution to degrease the surface of the sample, degreasing in the cleaning agent at 60°C for no less than 10 minutes; wash the sample with running water after degreasing;

[0042] 5. Deoxidize the aluminum and aluminum alloy samples at 25°C. The deoxidation time is 3 minutes. After taking it out, clean the surface of the sample with deionized water; the deoxidation solution is chromic anhydride (CrO 3 ) concentration is 45g / L, nitric acid (HNO 3 , ρ=1.42g / mL) concentration is 100g / L,...

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Abstract

The invention provides an anodizing method improving protection performance of aluminum and aluminum alloy. An anodizing solution is formed by mixing at least one of inorganic salt of sulfuric acid, sodium borate, malic acid and cerium and water according to the proportion. A voltage control manner is adopted in anodizing for anodizing treatment on aluminum or aluminum alloy materials. An anodized film layer prepared through the method is good in corrosion resistance, good in combining performance with an organic paint film and low in fatigue performance on a base body and has the beneficial effects of being simple in technology, stable in performance, high in film forming efficiency and small in environment pollution. Organic-inorganic hybrid chromium-free closing method is selected after anodizing, chromium and other poisonous and harmful substances are not contained in confining liquid completely, and waste liquid discharging does not exist in the sealing process. The sealed anodized film layer is good in corrosion resistance, and the combining force of an original anodized film layer paint film is not influenced. The anodizing method and the sealing method can be used for replacing traditional chromic acid anodizing, sulfuric acid anodizing and dichromate sealing technologies and is applied to protection of aluminum and aluminum material surfaces of various industries such as aviation.

Description

technical field [0001] The invention relates to an anodizing method for improving the protection performance of aluminum and aluminum alloy, and belongs to the technical field of metal surface treatment. Background technique [0002] Aluminum and aluminum alloys are currently one of the most widely used metal structural materials. Selecting the appropriate aluminum and aluminum alloy surface treatment process plays an important role in improving the corrosion resistance of aluminum and aluminum alloy, enhancing its bonding force with the organic coating, and ensuring the fatigue performance of the base material. The traditional aluminum and aluminum alloy surface protection process usually adopts sulfuric acid anodization or chromic acid anodization process. Although sulfuric acid anodization has good corrosion resistance, it has a great influence on the fatigue performance of the substrate, which cannot meet the safety and long-life requirements of aluminum and aluminum al...

Claims

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Application Information

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IPC IPC(8): C25D11/04C25D11/06C25D11/24
CPCC25D11/04C25D11/06C25D11/246
Inventor 王强宇波易俊兰吴松林汤智慧彭超陈洁朱瑞鑫孙志华王志申丁建岗宋袁曾吴宏亮
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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