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Preparation method of ceramic film through chemical conversion and micro-arc oxidation of aluminum and aluminum alloy

A technology of chemical conversion coating and micro-arc oxidation, which is applied in the direction of anodic oxidation and metal material coating technology, to achieve the effect of expanding application fields, improving corrosion resistance, improving decorative performance and corrosion resistance

Active Publication Date: 2011-11-16
北京京磁电工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the combination of chemical conversion and micro-arc oxidation has not been applied to the preparation of aluminum and aluminum alloy dark (white) ceramic films.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Surface cleaning of LY12 aluminum alloy: polished step by step with water abrasive paper, and the surface is cleaned with deionized water.

[0019] 2. Put the cleaned LY12 aluminum alloy into the chemical conversion treatment solution to form a chemical conversion film with metal ions on the surface of the aluminum alloy. The chemical conversion treatment solution is: 2 g / L sodium fluoride, 8 g / L potassium permanganate, 8 g / L sodium molybdate, adjust the pH to 2~4 with phosphoric acid, the treatment temperature is 40~60°C, and the treatment time is 5 ~10min.

[0020] 3. Putting the aluminum alloy having a chemical conversion film with metal ions formed in step 2 into the micro-arc oxidation electrolyte, and performing micro-arc oxidation treatment on it. The micro-arc oxidation electrolyte is: 6g / L sodium phosphate, 2 g / L sodium tungstate, 4g / L sodium tetraborate, the micro-arc oxidation treatment temperature is room temperature, and the micro-arc oxidation treatmen...

Embodiment 2

[0023] 1. Surface cleaning of LY12 aluminum alloy: polished step by step with water abrasive paper, and the surface is cleaned with deionized water.

[0024] 2. Put the cleaned LY12 aluminum alloy into the chemical conversion treatment solution to form a chemical conversion film with metal ions on the surface of the aluminum alloy. The chemical conversion treatment solution is: 1 g / L sodium fluoride, 8 g / L potassium permanganate, 5 g / L nickel acetate, 5 g / L sodium molybdate, adjust the pH to 2~4 with phosphoric acid, and the treatment temperature is 40~60 ℃, the treatment time is 5-10 minutes.

[0025] 3. Put the LY12 aluminum alloy that has formed a chemical conversion film with metal ions in step 2 into the micro-arc oxidation electrolyte, and perform micro-arc oxidation treatment on it. The micro-arc oxidation electrolyte is: 20g / L sodium silicate, 15g / L sodium pyrophosphate, 4g / L sodium hydroxide. The micro-arc oxidation treatment temperature is room temperature, and the ...

Embodiment 3

[0028] 1. Surface cleaning of LY12 aluminum alloy: LY12 aluminum alloy is polished step by step with water abrasive paper, and the surface is cleaned with deionized water.

[0029] 2. Put the cleaned LY12 aluminum alloy into the chemical conversion treatment solution to form a chemical conversion film with metal ions on the surface of the ALY12 aluminum alloy. The chemical conversion treatment solution is: 6g / L potassium permanganate, 3 / L potassium fluorozirconate, adjust the pH to 2-4 with phosphoric acid, the treatment temperature is 40-60°C, and the treatment time is 5-10 minutes.

[0030] 3. Put the LY12 aluminum alloy that has formed a chemical conversion film with metal ions in step 2 into the micro-arc oxidation electrolyte, and perform micro-arc oxidation treatment on it. The micro-arc oxidation electrolyte is: 20g / L sodium silicate, 15g / L sodium pyrophosphate, 4g / L sodium hydroxide. The micro-arc oxidation treatment temperature is room temperature, and the micro-arc o...

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Abstract

The invention belongs to the technical field of surface treatment, and relates to a preparation method of a ceramic film through chemical conversion and micro-arc oxidation of aluminum and aluminum alloy. The preparation method comprises: cleaning aluminum and aluminum alloy, and then carrying out chemical conversion treatment on the cleaned aluminum and aluminum alloy to generate chemical conversion film containing metal ions; and then placing the chemical conversion film in a micro-arc oxidation electrolyte and carrying out micro-arc oxidation treatment on the chemical conversion film to obtain dark micro-arc oxidized ceramic film. In the preparation method provided by the invention, different metal cations such as Mn<7+>, Mo<6+>, Ni<2+>, Ce<2+>, Co<2+> and Zr<2+> are introduced to formthe chemical conversion film containing the corresponding metal ion on the surfaces of the aluminum and aluminum alloy, then the chemical conversion film is placed in different micro-arc oxidation electrolytes, the micro-arc oxidized ceramic film with improved corrosion resistance is obtained by virtue of micro-arc oxidation treatment, and simultaneously the film is colored.

Description

technical field [0001] The invention belongs to the technical field of surface treatment and relates to a method for preparing aluminum and aluminum alloy chemical transformation-micro-arc oxidation dark ceramic film. technical background [0002] Aluminum alloy has low density, high strength, good plasticity, can be processed into various profiles, has excellent electrical conductivity, thermal conductivity and corrosion resistance, and is widely used in industry. However, its corrosion resistance is poor, and its surface hardness and wear resistance are difficult to meet high requirements for use. Therefore, it is very important to promote the development of corrosion and protection technology for aluminum alloys. [0003] Chemical conversion treatment is currently a convenient, economical and effective surface treatment technology, and it provides a good base for other protective methods such as coating and electroless plating. After chemical reaction, a layer of dense m...

Claims

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Application Information

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IPC IPC(8): C23F17/00C23C22/44C23C22/36C25D11/06
Inventor 邵忠财杨丽张璇
Owner 北京京磁电工科技有限公司
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