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Composite film and preparation method thereof

A composite film and film technology, applied in the field of composite film and its preparation, can solve problems such as many surface holes, achieve the effects of convenient operation, improved photocatalytic performance and corrosion resistance, and simple process

Inactive Publication Date: 2018-08-10
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method provided by the invention combines the micro-arc oxidation coating and the sol-gel coating, and solves the defect that there are many holes on the surface of a single micro-arc oxidation film

Method used

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  • Composite film and preparation method thereof
  • Composite film and preparation method thereof
  • Composite film and preparation method thereof

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preparation example Construction

[0032] The invention provides a kind of preparation method of composite film, comprises the following steps:

[0033] (1) The substrate is sequentially degreased, sanded and cleaned to obtain a pretreated substrate;

[0034] (2) carrying out the micro-arc oxidation coating film in the electrolytic solution containing nano-titanium dioxide with the pretreatment substrate that described step (1) obtains, obtains the micro-arc oxidation film;

[0035] (3) performing sol-gel coating on the micro-arc oxidation film obtained in the step (2) to obtain a composite film precursor;

[0036] (4) Drying and annealing the composite thin film precursor obtained in the step (3) in sequence to obtain a composite thin film.

[0037] In the invention, the substrate is degreased, sanded and cleaned in sequence to obtain the pretreated substrate. In the present invention, the base body is preferably aluminum alloy, and the size of the base body is preferably 20×10×3 mm. In the present inventio...

Embodiment 1

[0070] (1) Substrate pretreatment: first, the aluminum alloy substrate is made into a small sample with a size of 20×10×3 mm by wire cutting. Then the samples were subjected to degreasing, grinding, cleaning and other processes.

[0071] ① Degreasing: ultrasonically clean the cut substrate with acetone for 20 minutes, and dry it for later use;

[0072] ②Grinding: Use 200#, 400#, 600#, 800#, 1000# sandpaper to polish the surface of the sample step by step;

[0073] ③Cleaning: ultrasonically clean the polished samples with alcohol and deionized water for 20 minutes respectively.

[0074] (2) Preparation of micro-arc oxidation film:

[0075] ① Preparation of electrolyte: Before micro-arc oxidation, first weigh 10g / L sodium silicate, 1g / L potassium hydroxide, and 4g / L nano-titanium dioxide, then add the corresponding volume of deionized water into the electrolytic cell, and stir. Allow the electrolyte to fully dissolve and mix well.

[0076] ②Connecting electrodes: hang the sa...

Embodiment 2

[0094] (1) Substrate pretreatment: first, the aluminum alloy substrate is made into a small sample with a size of 20×10×3 mm by wire cutting. Then the samples were subjected to degreasing, grinding, cleaning and other processes.

[0095] ① Degreasing: ultrasonically clean the cut substrate with acetone for 20 minutes, and dry it for later use;

[0096] ②Grinding: Use 200#, 400#, 600#, 800#, 1000# sandpaper to polish the surface of the sample step by step;

[0097] ③Cleaning: ultrasonically clean the polished samples with alcohol and deionized water for 20 minutes respectively.

[0098] (2) Preparation of micro-arc oxidation film:

[0099] ① Preparation of electrolyte: Before micro-arc oxidation, first weigh 5g / L sodium silicate, 2g / L potassium hydroxide, and 1g / L nano-titanium dioxide, then add the corresponding volume of deionized water into the electrolytic cell, and stir. Allow the electrolyte to fully dissolve and mix well.

[0100] ②Connecting electrodes: hang the sam...

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Abstract

The invention provides a preparation method of a composite film and belongs to the field of composite films. The preparation method comprises the following steps of: sequentially carrying out oil removal, grinding by using abrasive paper and washing on a base body to obtain a pretreated base body; carrying out micro-arc oxidation coating on the pretreated base body in electrolyte which contains nanometer titanium dioxide to obtain a micro-arc oxidation film; carrying out sol-gel coating on the micro-arc oxidation film to obtain a composite film precursor; and sequentially drying and annealingthe composite film precursor to obtain the composite film. According to the preparation method provided by the invention, micro-arc oxidation coating and sol-gel coating are combined, a sol-gel methodis used for coating sol to prepare the composite film, thus a sol-gel film totally clings to the surface of the micro-arc oxidation film, the binding force of the sol-gel film is increased, a hole sealing effect is also achieved on a surface hole structure of the micro-arc oxidation film , and the defect that the surface of a single micro-arc oxidation film has lots of holes and the defect that asingle sol-gel film has poor binding force with the base body are overcome.

Description

technical field [0001] The invention relates to the technical field of composite film preparation, in particular to a composite film and a preparation method thereof. Background technique [0002] TiO 2 The thin film has good chemical stability, excellent photocatalytic properties and hydrophilicity, so that it presents great application potential in sewage treatment, air purification, electronic materials, optical materials, biological materials and metal surface protection. [0003] Micro-arc oxidation is a method for in-situ formation of high-quality ceramic oxide films on the surface of valve metals such as aluminum, magnesium, and titanium. Micro-arc oxidation is developed from anodic oxidation. The valve metal is used as the anode, and stainless steel or graphite is used as the cathode. Placed in an electrolyte solution of a certain composition to react, and finally obtain a ceramic oxide film with high hardness, good corrosion resistance and high wear resistance. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26C23C18/12C23C28/04
CPCC23C18/1216C23C18/1254C23C28/042C25D11/026C25D11/26
Inventor 魏世丞王玉江梁义王亚子王博郭蕾黄玉炜黄威
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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