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Method for preparing porous anodic alumina film by using industrial pure aluminum

A technology of industrial pure aluminum and aluminum oxide film, which is applied in anodic oxidation and other directions, can solve the problems of unfavorable industrial production, high cost and low cost of high-purity aluminum, and achieve the effects of easy control, low cost and convenient operation

Inactive Publication Date: 2009-12-16
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the aluminum substrates for the preparation of porous alumina membranes all use high-purity or ultra-high (purity is more than 99.99%) aluminum sheets, but because the cost of high-purity aluminum is too high, it is not conducive to industrial production; and the cost of industrial pure aluminum is relatively low. Experimental conditions, the use of industrial pure aluminum to prepare porous alumina membranes with excellent porosity will have important practical value in the research and adsorption of nanostructure assembly systems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] (1) An industrially pure aluminum sheet with a length of 4cm, a width of 3cm, a thickness of 0.3mm, and a purity of 99.5% was annealed in the air at 500°C for 4h and cooled with the furnace; % acetone solution for 30min ultrasonic degreasing treatment, then soaked in 90g / L NaOH solution for 5min to remove the oxide layer on the aluminum surface, then rinsed with distilled water, and then immersed in 2.5mol / L HNO 3 30 seconds, remove and rinse with distilled water. At 0°C, at a volume ratio of V (C2H5OH) :V (LClO4) = 3:1 C 2 h 5 OH and HClO 4 Perform constant voltage electrochemical polishing in the mixed solution for 2-3 minutes to remove the oxide layer on the surface of the aluminum sheet and improve the smoothness of the surface. Finally, rinse with distilled water and dry for later use.

[0010] (2) Use the aluminum sheet treated in step (1) as an anode, and stainless steel as a cathode, and prepare an alumina template by a secondary anodic oxidation method. ...

Embodiment 2

[0012] (1) Anneal an industrially pure aluminum sheet with a length of 4cm, a width of 3cm, a thickness of 0.3mm, and a purity of 99.0% in air at 400°C for 4h and cool with the furnace; % acetone solution for 30min ultrasonic degreasing treatment, then soaked in 90g / L NaOH solution for 5min to remove the oxide layer on the aluminum surface, then rinsed with distilled water, and then immersed in 2.5mol / L HNO 3 30 seconds, remove and rinse with distilled water. At 0°C, at a volume ratio of V (C2H5OH) :V (HClO4) = 3:1 C 2 h 5 OH and HClO 4 Perform constant-voltage electrochemical polishing in the mixed solution for 3 minutes to remove the oxide layer on the surface of the aluminum sheet and improve the smoothness of the surface. Finally, rinse with distilled water and dry for later use.

[0013] (2) Use the aluminum sheet treated in step (1) as an anode, and stainless steel as a cathode, and prepare an alumina template by a secondary anodic oxidation method. Firstly, in 0...

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Abstract

The invention discloses a method for preparing a porous anodic alumina film by using industrial pure aluminum. By controlling process conditions such as voltage, electrolyte category, temperature, concentration and the like, a nano-scale porous alumina template with narrow diameter distribution range is prepared. The method is carried out in ice-water bath, and has the advantages of low used raw material cost, simple equipment, convenient operation and easy control; and the hole diameter of the alumina template obtained by the method is about 50 to 60 nanometers, and is evenly distributed.

Description

technical field [0001] The invention relates to a method for preparing a porous anodic aluminum oxide film by utilizing industrial pure aluminum. Background technique [0002] At present, the aluminum substrates for the preparation of porous alumina membranes all use high-purity or ultra-high (purity is more than 99.99%) aluminum sheets, but because the cost of high-purity aluminum is too high, it is not conducive to industrial production; and the cost of industrial pure aluminum is relatively low. Under the experimental conditions, the use of industrial pure aluminum to prepare porous alumina membranes with excellent porosity will have important practical value in the research and adsorption of nanostructure assembly systems. Contents of the invention [0003] The object of the present invention is to provide a method for preparing uniformly distributed and ordered nanoporous anodized aluminum with a purity of 99.0%-99.9% as a matrix, oxalic acid as an electrolyte, and se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04
Inventor 覃爱苗谢宗仁陈海念
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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