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Green and environment-friendly sealing method for surface anode oxidization of aluminum alloy

A technology of aluminum alloy surface and anodic oxide film, applied in surface reaction electrolytic coating, electrolytic coating, coating and other directions, can solve the problem of poisonous sealing liquid, and achieve the effect of stable composition, uniform color and strong corrosion resistance

Inactive Publication Date: 2013-09-18
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to propose a green and environment-friendly sealing method for aluminum alloy anodic oxidation film. The sealing solution of the present invention solves the defects that the existing sealing solution contains toxic and harmful substances. Sealing treatment can avoid Ni in the sealing process 2+ , F- and Cr 6+ The use of the sealing solution is easy to prepare, the composition is stable, and the operation is simple. The sealing method of the green aluminum alloy anodic oxidation film

Method used

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  • Green and environment-friendly sealing method for surface anode oxidization of aluminum alloy
  • Green and environment-friendly sealing method for surface anode oxidization of aluminum alloy
  • Green and environment-friendly sealing method for surface anode oxidization of aluminum alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0015] The green environmental protection sealing treatment of 2A12 aluminum alloy anodic oxidation film includes the following steps:

[0016] Step 1: Configure blocking solution: cerium nitrate 5g / L, prepared with deionized water, heated to 30°C and stirred to accelerate dissolution;

[0017] The second step: hang the aluminum alloy sample containing the anodized film;

[0018] Step 3: Hang it into the blocking solution at 90°C, soak it for 25 minutes at a magnetic stirring rate of about 300 revolutions per minute, and then take the sample out of the blocking solution;

[0019] Step 4: Rinse the sample treated in the third step with clean water, and then rinse with deionized water for 10 seconds; the sample after deionized rinsing is dried with a hair dryer for 5 minutes.

[0020] Take pictures of the samples before and after sealing. figure 1 In (a), (b) shown. Carry out scanning electron microscope SEM test before and after the sample is sealed, such as figure 2 In (a...

Embodiment 2

[0023] The green environmental protection sealing treatment of 2A12 aluminum alloy anodic oxidation film includes the following steps:

[0024] Step 1: Configure blocking solution: cerium nitrate 3-10g / L, prepared with deionized water, heat to 30-40°C and stir to accelerate dissolution;

[0025] The second step: hang the aluminum alloy sample containing the anodized film;

[0026] Step 3: Hang it into the blocking solution at 80°C, soak for 30 minutes at a magnetic stirring rate of about 300 rpm, and then take the sample out of the blocking solution;

[0027] Step 4: Rinse the sample treated in the third step with clean water, and then rinse it with deionized water for 10 seconds; dry the sample after deionized rinsing with a hair dryer for 3 minutes.

[0028] After sealing, do Tafel polarization curve test on the sample, the result is as follows image 3 Curve a

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Abstract

The invention belongs to the technical field of metal surface treatment, and particularly relates to a green and environment-friendly sealing method for an anode oxidization membrane of aluminum alloy. The sealing fluid used in the sealing method is aqueous solution cerium nitrate, and the cerium nitrate content per litre aqueous solution is 3-10g. With the sealing fluid, the defect that the existing sealing fluid contains toxic and harmful substances can be solved, the use of chromate and nickel salt in the sealing process can be avoided by sealing the anode oxide membrane of the aluminum alloy through the sealing fluid, so that the sealing method is a green and environment-friendly sealing method for the anode oxidization membrane of the aluminum alloy. The method is stable in technique, and the sealing fluid is easy to prepare, and low in cost, does not contain fluorine ions and hexavalent chromium ions, thus being green and safe sealing fluid which meets environment-friendly requirement. Compared with the traditional technology, the equivalent aluminum and aluminum alloy anode oxidization membrane corrosion resistance can be achieved.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and more particularly relates to a sealing method for sealing aluminum alloy anodized film. Background technique [0002] Anodizing is a traditional surface modification technology for aluminum and aluminum alloys. It is an electrochemical oxidation method in which the metal or alloy is placed in a suitable electrolyte as an anode for electrical treatment to form an oxide film on the surface. This technology is used for surface treatment of aluminum and aluminum alloys, and a layer of aluminum oxide film is formed on the surface, which improves the corrosion resistance, wear resistance and thermal shock resistance of aluminum and its alloys to a certain extent. , electronics, decoration and other fields have broad application prospects. The anodized film has a double-layer structure, the inner layer is thin and dense, which is called the barrier layer, and the outer layer is a th...

Claims

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Application Information

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IPC IPC(8): C25D11/24
Inventor 于美马荣豹李松梅刘建华刘英智李志勇杨茗佳王永平
Owner BEIHANG UNIV
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