Preparation method for super hydrophobic protective film on surface of high strength aluminum alloy

An aluminum alloy surface, super-hydrophobic technology, applied to the surface coating liquid device, special surface, metal material coating process, etc., to achieve the effect of simple process, convenient operation, and easy large-scale industrial production

Inactive Publication Date: 2013-01-02
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the difficulties and problems in the preparation of superhydrophobic protective film on the surface of high-strength aluminum alloy in the prior art, the purpose of the present invention is to provide a method for preparing a superhydrophobic protective film on the surface of high-strength aluminum alloy

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  • Preparation method for super hydrophobic protective film on surface of high strength aluminum alloy

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Experimental program
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Effect test

Embodiment 1

[0022] The 2024 high-strength aluminum alloy workpiece with a clean surface is subjected to the following treatments in sequence:

[0023] ① Hydrothermal film formation: Immerse the clean high-strength aluminum alloy workpiece in a reaction kettle filled with 0.001mol / L cerium nitrate aqueous solution, seal the reaction kettle and keep it in an oven at 130°C for 3 hours, then naturally cool to room temperature, Take out the workpiece and dry it;

[0024] ② Hydrophobic treatment of the film layer: soak the high-strength aluminum alloy workpiece after hydrothermal film formation in step ① in the hydrophobic treatment solution at room temperature for 10 hours, take it out and dry it at 85°C for 1 hour to obtain the high-strength aluminum alloy surface Superhydrophobic protective film.

[0025] The hydrophobic treatment solution is a solution obtained by mixing dodecafluoroheptylpropyltrimethoxysilane and absolute ethanol at a volume ratio of 1:100 and magnetic stirring for 2 hou...

Embodiment 2

[0031] The 2024 high-strength aluminum alloy workpiece with a clean surface is subjected to the following treatments in sequence:

[0032] ① Hydrothermal film formation: Immerse the clean high-strength aluminum alloy workpiece in a reaction kettle filled with 0.0005mol / L samarium nitrate aqueous solution, seal the reaction kettle and keep it in an oven at 160°C for 2 hours, then naturally cool to room temperature, Take out the workpiece and dry it;

[0033] ② Hydrophobic treatment of the film layer: soak the high-strength aluminum alloy workpiece after hydrothermal film formation in step ① in the hydrophobic treatment solution at room temperature for 6 hours, take it out and dry it at 90°C for 0.5 hour to obtain the high-strength aluminum alloy surface Superhydrophobic protective film.

[0034] The hydrophobic treatment solution is a solution obtained by mixing dodecafluoroheptylpropyltrimethoxysilane and absolute ethanol at a volume ratio of 1:80 and magnetic stirring for 1 ...

Embodiment 3

[0037] The surface-cleaned 7075 high-strength aluminum alloy workpiece is subjected to the following treatments in sequence:

[0038] ① Hydrothermal film formation: Immerse the clean high-strength aluminum alloy workpiece in a reaction kettle filled with 0.001mol / L lanthanum nitrate aqueous solution, seal the reaction kettle and keep it in an oven at 120°C for 5 hours, then naturally cool to room temperature, Take out the workpiece and dry it;

[0039] ② Hydrophobic treatment of the film layer: soak the high-strength aluminum alloy workpiece after hydrothermal film formation in step ① in the hydrophobic treatment solution at room temperature for 12 hours, take it out and dry it at 80°C for 1 hour to obtain the high-strength aluminum alloy surface Superhydrophobic protective film.

[0040] The hydrophobic treatment solution is a solution obtained by mixing dodecafluoroheptylpropyltrimethoxysilane and absolute ethanol at a volume ratio of 1:120 and magnetic stirring for 2 hours...

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Abstract

The invention provides a preparation method for a super hydrophobic protective film on a surface of a high strength aluminum alloy. The preparation method comprises two steps of hydrothermally forming a film and hydrophobizing a film layer, wherein a solution used in the step of hydrothermally forming the film is a rare earth nitrate water solution, so that a rare earth oxide film with a good protection effect for the high strength aluminum alloy and a specific nanometer / micron rough structure can be obtained; and the nanometer / micron rough structure of the rare earth oxide film lays a foundation for achieving a super hydrophobic function of the film layer, so that the super hydrophobic function of the film layer can be achieved by hydrophobizing the film layer, thereby reducing probability for direct contact between the high strength aluminum alloy and a corrosion medium so as to further enhance the protection effect of the film layer. The super hydrophobic protective film on the surface of the high strength aluminum alloy prepared by the preparation method has good super hydrophobic and protection functions, and is expected to be widely applied. The preparation method has characteristics of greennesss and environment-friendliness, simple process, convenience for operation and easiness for large-scale industrial production and the like.

Description

technical field [0001] The invention belongs to the field of surface treatment of metal materials, and in particular relates to a preparation method of a superhydrophobic protective film on the surface of a high-strength aluminum alloy. [0002] Background technique [0003] High-strength aluminum alloy is a kind of high-strength duralumin. Due to its advantages of light weight, high specific strength and high specific stiffness, it is widely used in the aerospace field, and is often used to make various high-load parts and components, such as aircraft On the skeleton, skin, bulkhead, ribs, spars, rivets, etc. As aircraft must face complex and harsh natural environments during their service, corrosion problems cannot be ignored. Corrosion not only destroys the high-strength aluminum alloy itself, but also poses a serious threat to the structural integrity of the aircraft, and even leads to major accidents involving aircraft crashes and fatalities. Therefore, the developme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/08B05D7/24C23C22/56
Inventor 雷惊雷李凌杰黄涛何建新徐辉潘复生
Owner CHONGQING UNIV
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