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Method for sealing aluminum alloy micro-arc oxidation film layer

A technology of micro-arc oxidation and aluminum alloy, which is applied in coatings, surface reaction electrolytic coatings, electrolytic coatings, etc., can solve problems such as high cost, complicated process, and environmental pollution, and achieve enhanced bonding, simple process, and simple ingredients Effect

Inactive Publication Date: 2013-06-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the disadvantages of complex process, high cost, and environmental pollution in the prior art, the present invention proposes a sealing method for aluminum alloy micro-arc oxidation film layer

Method used

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  • Method for sealing aluminum alloy micro-arc oxidation film layer

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Embodiment 1

[0026] This embodiment is a method for sealing the micro-arc oxidation film layer of 7A85-T7452 aluminum alloy. The size of the aluminum alloy sample to be sealed is 30 mm × 20 mm × 5 mm, and the thickness of the micro-arc oxidation film is 50 μm. The specific process is:

[0027] Step 1. Preprocessing:

[0028] Put the sample in acetone and ultrasonically clean it for 3 minutes to remove oil, take it out and dry it, put it in deionized water for cleaning for 3 minutes, and dry it for later use.

[0029] Step 2. Prepare the sealing sol: In this embodiment, the specific volume ratio of the sealing sol is: ethyl orthosilicate: absolute ethanol: silane coupling agent: deionized water=4:8:1:2, to be sealed The sample surface area is 17cm 2 , the total amount of sol used is 95ml.

[0030] The specific process of preparing the blocked sol is as follows: add 25ml of absolute ethanol and 25ml of tetraethyl orthosilicate to a 100ml beaker A in sequence, and stir evenly with a glass...

Embodiment 2

[0035] This embodiment is a method for sealing the micro-arc oxidation film layer of 7A85-T7452 aluminum alloy. The size of the aluminum alloy sample to be sealed is 30 mm × 20 mm × 5 mm, and the thickness of the micro-arc oxidation film is 50 μm. The specific process is:

[0036] Step 1. Preprocessing:

[0037] Put the sample in acetone and ultrasonically clean it for 3 minutes to remove oil, take it out and dry it, put it in deionized water for cleaning for 3 minutes, and dry it for later use.

[0038] Step 2. Prepare the sealing sol: In this embodiment, the specific volume ratio of the sealing sol is: ethyl orthosilicate: absolute ethanol: silane coupling agent: deionized water=5: 10: 1.5: 2.5, to be sealed The sample surface area is 17cm 2 , The total amount of sol used is 95ml.

[0039]The specific process of preparing the blocked sol is as follows: add 25ml of absolute ethanol and 25ml of tetraethyl orthosilicate to a 100ml beaker A in sequence, and stir evenly with ...

Embodiment 3

[0044] This embodiment is a method for sealing the micro-arc oxidation film layer of 7B50-T76511 aluminum alloy. The size of the aluminum alloy sample to be sealed is 40 mm × 20 mm × 2 mm, and the thickness of the micro-arc oxidation film is 40 μm. The specific process is:

[0045] Step 1. Preprocessing:

[0046] Put the sample in acetone and ultrasonically clean it for 3 minutes to remove oil, take it out and dry it, put it in deionized water for cleaning for 3 minutes, and dry it for later use.

[0047] Step 2. Prepare the sealing sol: In this embodiment, the specific volume ratio of the sealing sol is: ethyl orthosilicate: absolute ethanol: silane coupling agent: deionized water=4:8:1:2, to be sealed The sample surface area is 18cm 2 , The total amount of sol used is 90ml.

[0048] The specific process of preparing the blocked sol is as follows: add 24ml of absolute ethanol and 24ml of ethyl orthosilicate to a 100ml beaker A in sequence, and stir evenly with a glass rod...

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Abstract

The invention discloses a method for sealing an aluminum alloy micro-arc oxidation film layer. The method comprises the following steps of: cleaning the surface of an aluminum alloy sample subjected to micro-arc oxidation, then placing the aluminum alloy sample in sealing sol for sealing, and then, curing the aluminum alloy sample at room temperature and roasting the aluminum alloy sample to obtain a sealed aluminum alloy sample. The sealing sol is prepared from ethyl orthosilicate, absolute ethyl alcohol, a silane coupling agent and deionized water. The sealing sol used in the method has no components harmful to human bodies and the environment, and the dispersibility and the uniformity of the sealing sol are better so that the bonding force between the sealed surface and a sequent coating can be enhanced. The porosity of the film layer on the sealed surface of the sample is effectively reduced, and microcracks on the surface of the sample are sealed, so that the surface becomes smooth, the corrosion resistance of a micro-arc oxidation film is improved, and an aluminum alloy matrix is protected well. The method has the characteristics of simplicity in operation and low cost so as to be suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of material surface treatment, and relates to a sealing method, in particular to a sealing method of an aluminum alloy micro-arc oxidation film layer. Background technique [0002] Aluminum alloy has been widely used in aerospace, automobile, electronics, communication and other fields due to its high specific strength and specific stiffness, easy processing and forming, abundant reserves, and easy recycling. [0003] Aluminum has high chemical activity, and an oxide film can be naturally formed on the surface in the atmosphere. However, the naturally formed oxide film is very thin and has limited protection for the base material. Under corrosive conditions, especially in the presence of chloride ions, the corrosion damage of aluminum and its alloys is very serious, which greatly limits the application range of aluminum alloys and the service life of aluminum alloy structures. To solve this problem, it is ...

Claims

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Application Information

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IPC IPC(8): C25D11/18
Inventor 叶作彦李重阳刘道新张晓化袁萌
Owner NORTHWESTERN POLYTECHNICAL UNIV
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