Preparation method for aluminum alloy surface chromium-free corrosion-resistant chemical conversion membrane formation solution and membrane layer

A technology of aluminum alloy surface and chemical conversion coating, applied in the direction of metal material coating process, etc., can solve the problems of high cost, high film forming temperature, unsatisfactory corrosion resistance, etc. The effect of salt spray corrosion performance improvement

Pending Publication Date: 2019-03-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a chromium-free corrosion-resistant chemical conversion film film-forming solution and film preparation method on the surface of aluminum alloys, which can replace the 6+ The advanced chromate conversion treatment process solves the problems of high film-forming temperature, unsatisfactory corrosion resistance and high cost of the existing chromium-free conversion treatment technology, and effectively improves the corrosion resistance of the aluminum alloy substrate itself in harsh corrosive environments and is compatible with organic coatings. layer adhesion

Method used

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  • Preparation method for aluminum alloy surface chromium-free corrosion-resistant chemical conversion membrane formation solution and membrane layer
  • Preparation method for aluminum alloy surface chromium-free corrosion-resistant chemical conversion membrane formation solution and membrane layer

Examples

Experimental program
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Embodiment 1

[0036] In this example, the method for preparing a chromium-free corrosion-resistant chemical conversion film on the surface of an aluminum alloy is processed according to the following process flow:

[0037] (1) Grinding

[0038] The surface of the rolled 5083 aluminum alloy was polished with 1000-grit sandpaper, and a hole was punched in the middle of the upper part of the aluminum alloy sample for the convenience of hanging the aluminum alloy sample.

[0039] (2) Degreasing

[0040] The aluminum alloy sample was ultrasonically treated in a degreasing solution for 5 minutes at room temperature, and rinsed with running water for 1 minute after degreasing. Wherein, the composition of the chemical degreasing solution is: 20g / L sodium hydroxide, 20g / L sodium carbonate, 5g / L sodium silicate, and the balance is water.

[0041] (3) Alkaline washing

[0042] Soak the degreased aluminum alloy sample in the alkali cleaning solution for 20 seconds, the temperature of the alkali clea...

Embodiment 2

[0053] In the present embodiment, the preparation method of the chromium-free corrosion-resistant chemical conversion coating on the aluminum alloy surface is processed according to the following process flow:

[0054] (1) Grinding

[0055] The surface of the rolled 6061 aluminum alloy was polished with 1000-grit sandpaper. In order to facilitate the suspension of the aluminum alloy sample, a hole was punched in the upper middle of the aluminum alloy sample.

[0056] (2) Degreasing

[0057] The aluminum alloy samples were ultrasonically treated in degreasing solution for 3 min at room temperature, and rinsed with running water for 1.5 min after degreasing. Wherein, the composition of the chemical degreasing solution is: 10g / L potassium hydroxide, 20g / L potassium carbonate, 3g / L sodium silicate, and the balance is water.

[0058] (3) Alkaline washing

[0059] The aluminum alloy samples after degreasing were immersed in the alkaline washing solution for 30 seconds, the temper...

Embodiment 3

[0067] In the present embodiment, the preparation method of the chromium-free corrosion-resistant chemical conversion coating on the aluminum alloy surface is processed according to the following process flow:

[0068] (1) Grinding

[0069] The surface of the rolled 2024 aluminum alloy was polished with 1000-grit sandpaper. In order to facilitate the suspension of the aluminum alloy sample, a hole was punched in the upper middle of the aluminum alloy sample.

[0070] (2) Degreasing

[0071] The aluminum alloy samples were ultrasonically treated in degreasing solution for 12 minutes at room temperature, and rinsed with running water for 2 minutes after degreasing. Wherein, the composition of the chemical degreasing solution is: 20g / L sodium carbonate, 10g / L sodium phosphate, 5g / L sodium silicate, 3g / L sodium dodecylbenzenesulfonate, and the balance is water.

[0072] (3) Alkaline washing

[0073] The aluminum alloy samples after degreasing were immersed in the alkaline washi...

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Abstract

The invention relates to an aluminum alloy surface corrosion resistance treatment and in particular discloses a preparation method for an aluminum alloy surface chromium-free corrosion-resistant chemical conversion membrane formation solution and a membrane layer. The membrane formation solution is a mixed solution with a main salt, a buffer agent, a membrane formation promoter, a pH value adjuster and water, and the pH value of the membrane formation solution is 2-5. The chemical conversion membrane formation preparation method comprises four steps of oil removal, alkali washing, acid washingactivation and membrane formation, the whole treatment process is free of components such as chromium or chromate which can do harm to the environment, the membrane formation process is simple, the membrane formation solution is low in constitution component cost, the obtained chemical conversion membrane is uniform and dense and excellent in corrosion resistance, and the bonding force of an organic coating and an aluminum alloy substrate can be remarkably improved.

Description

technical field [0001] The invention relates to an aluminum alloy surface anticorrosion treatment technology, in particular to a chromium-free corrosion-resistant chemical conversion film forming solution and a film layer preparation method on the aluminum alloy surface. Background technique [0002] Due to its superior mechanical properties, aluminum alloys are widely used in aerospace, shipbuilding, transportation and construction industries, and have become one of the most important engineering structural materials. Although aluminum alloy is easy to form a layer of oxide film on the surface in the air, which has a certain protective effect on the alloy, but it is not enough to meet the needs of industrial protection, and it is prone to severe corrosion in harsh corrosive environments. Two-step treatment is required before use: surface modification treatment and spraying organic coating. [0003] Aluminum alloy surface modification treatment technologies mainly include s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/36C23C22/34C23C22/08C23C22/78C23G1/22
CPCC23C22/08C23C22/34C23C22/36C23C22/361C23C22/78C23G1/22
Inventor 杨延格刘洋张涛于宝兴张春艳王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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