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Preparation method of anodized aluminum oxide on aluminum surface

A technique for anodizing aluminum and aluminum surfaces, applied in the direction of surface reaction electrolytic coatings, electrolytic coatings, coatings, etc., can solve the problems of low mechanical strength and inability to meet functional applications, achieve low cost, shorten preparation time, and solve The effect of taking too long to prepare

Pending Publication Date: 2021-08-10
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This layer of oxide film is thin and has low mechanical strength, which cannot meet the requirements of functional applications

Method used

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  • Preparation method of anodized aluminum oxide on aluminum surface
  • Preparation method of anodized aluminum oxide on aluminum surface
  • Preparation method of anodized aluminum oxide on aluminum surface

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preparation example Construction

[0018] In the present invention, the preparation method of anodized aluminum on aluminum surface comprises the following steps:

[0019] (1) Pretreatment of pure aluminum;

[0020] (2) dissolving organic phosphonic acid in deionized water as an electrolyte, using the pure aluminum treated in step (1) as an anode, and using a graphite electrode as a cathode, and electrochemically oxidizing for 5min-20min;

[0021] (3) The pure aluminum treated in step (2) is taken out, washed with deionized water and dried, that is, porous alumina is prepared on the surface of the pure aluminum.

[0022] Among them, the pretreatment of pure aluminum is to place the pure aluminum or alumina after mechanical grinding and deionized water washing in 0.1mol / L sodium hydroxide aqueous solution at room temperature for 60s, take it out, wash it with deionized water and dry it. The organic phosphonic acid is N-(phosphonomethyl)iminodiacetic acid, and the concentration of its aqueous solution is 0.8mol / ...

Embodiment 1

[0024] Put the pure aluminum after mechanical grinding and deionized water cleaning in 0.1mol / L sodium hydroxide aqueous solution at room temperature for 60s, take it out, wash it with deionized water and dry it; prepare 1.0mol / LN-(phosphonomethyl) Iminodiacetic acid is used as the electrolyte, the pretreated pure aluminum material is used as the anode, the graphite electrode is used as the cathode, and the current density is 35mAcm -2 , after 5 minutes of electrochemical oxidation, take it out, rinse it with deionized water, and then dry it to prepare nano-scale porous alumina on the aluminum surface.

Embodiment 2

[0026] Put the pure aluminum that has been mechanically polished and washed with deionized water in 0.1mol / L sodium hydroxide aqueous solution at room temperature for 60s, take it out, wash it with deionized water and dry it; prepare 0.9mol / LN-(phosphonomethyl) Iminodiacetic acid is used as the electrolyte, the pretreated pure aluminum material is used as the anode, the graphite electrode is used as the cathode, and the current density is 33mAcm -2 , take it out after electrochemical oxidation for 10 minutes, rinse it with deionized water and dry it, then nano-scale porous alumina can be prepared on the aluminum surface.

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Abstract

The invention belongs to the field of metal material surface treatment, and particularly discloses a preparation method of anodized aluminum oxide on the aluminum surface. The method is characterized in that an aqueous solution of organic phosphonic acid is taken as an electrolyte, aluminum is taken as an anode, electrochemical oxidation treatment is carried out, and porous alumina is generated on the surface of the aluminum. According to the method, a highly-ordered nano-scale porous structure is formed on the aluminum surface by selecting the proper anodic oxidation electrolyte solution and proper anodic oxidation conditions and adopting an anodic oxidation method, so that the preparation time is greatly shortened, and the problems that the preparation time of anodic aluminum oxide on the pure aluminum surface is too long and the application is limited are solved.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a preparation method of porous anodized aluminum. Background technique [0002] Aluminum is a highly active metal, which can naturally form an oxide film with a thickness of several hundred nanometers in the air. This layer of oxide film is thin and has low mechanical strength, which cannot meet the requirements of functional applications. In order to obtain an oxide film layer with special functions, surface treatment of aluminum is required. Usually in the electrolyte, the aluminum is used as the anode for electrochemical oxidation treatment, so as to obtain an oxide film on the surface of the aluminum. The porous anodized aluminum film is obtained by electrochemically oxidizing aluminum in an acidic electrolyte such as oxalic acid, phosphoric acid, sulfuric acid, etc. It is a hexagonal close-packed periodic structure. Porous anodic aluminum oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/10C25D11/16
CPCC25D11/10C25D11/16
Inventor 臧东勉黄志超张奇张帆李非凡徐育镕
Owner EAST CHINA JIAOTONG UNIVERSITY