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Preparation method of large-area high-order porous anodised aluminium film

A highly ordered and porous anode technology, applied in the field of electrochemistry, can solve the problems affecting the uniform growth of oxide film, difficulty, flash fire, etc., and achieve the effect of obvious self-organization effect and rapid preparation

Inactive Publication Date: 2013-01-23
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It should be pointed out that these hard oxidation processes are all realized at low temperature (below about 5°C). If the temperature is not well controlled, electrical breakdown or flash fire will still occur, which will affect the uniform growth of the oxide film.
Moreover, due to the high current density in the hard oxidation process, the electrolyte heats up seriously. To control the entire anodizing system in the low temperature range, it is necessary to increase the amount of electrolyte and use a powerful cooling system.
This is both uneconomical and difficult to implement for industrial applications

Method used

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  • Preparation method of large-area high-order porous anodised aluminium film

Examples

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Effect test

Embodiment 1

[0020] First, immerse an aluminum foil strip with a purity of 99.99%, a thickness of 200 μm, and a width of 10 mm in a 2 wt % sodium hydroxide solution at a temperature of 70 ° C for 2 minutes to remove the natural oxide film on the aluminum surface. Then rinse it with deionized water, put it into the electrolytic cell as the anode, and use another aluminum foil strip of the same size that has not been treated to remove the natural oxide film as the cathode. With 6M concentrated sulfuric acid aqueous solution as the electrolyte, at 100mA·cm -2 The current density of the constant current anodization is carried out under the condition of vigorously stirring the electrolyte. The temperature of the electrolyte is maintained at about 20°C by a water bath. The oxidation time is determined by the thickness of the PAA template, and the growth rate of the oxide film is about 3 μm min -1 . The morphology of the obtained samples is as figure 1 shown. figure 1 (a) is the SEM image of...

Embodiment 2

[0022] First, immerse an aluminum foil strip with a purity of 99.99%, a thickness of 200 μm, and a width of 10 mm in a 3 wt % sodium hydroxide solution at a temperature of 65 ° C for 3 minutes to remove the natural oxide film on the aluminum surface. Then rinse it with deionized water, put it into the electrolytic cell as the anode, and use another aluminum foil strip of the same size that has not been treated to remove the natural oxide film as the cathode. Using 1M concentrated sulfuric acid aqueous solution as the electrolyte, the constant current anodic oxidation was carried out under the condition of vigorously stirring the electrolyte at a current density of 50mA·cm-2. The temperature of the electrolyte is maintained at about 10°C by a water bath. The oxidation time is determined by the thickness of the PAA template, and the growth rate of the oxide film is about 1 μm·min-1. The average hole spacing of PAA nanoholes is about 45nm.

Embodiment 3

[0024] First, immerse an aluminum foil strip with a purity of 99.99%, a thickness of 200 μm, and a width of 10 mm in a 3 wt % sodium hydroxide solution at a temperature of 75 ° C for 1 minute to remove the natural oxide film on the aluminum surface. Then rinse it with deionized water, put it into the electrolytic cell as the anode, and use another aluminum foil strip of the same size that has not been treated to remove the natural oxide film as the cathode. Using 6M concentrated sulfuric acid aqueous solution as the electrolyte, the constant current anodic oxidation is carried out under the condition of vigorously stirring the electrolyte at a current density of 80mA·cm-2. The temperature of the electrolyte is maintained at about 40°C by a water bath. The oxidation time is determined by the thickness of the PAA template, and the growth rate of the oxide film is about 2 μm·min-1. The average hole spacing of PAA nanoholes is about 55nm.

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Abstract

The invention discloses a preparation method of a large-area high-order porous anodised aluminium film. Based on a principle of generating electric breakdown, an acidic electrolyte with high concentration is adopted for carrying out high-current-density constant-current anodic oxidization under a high temperature, so that the anodised aluminium film can uniformly and stably grow without causing the electric breakdown, an aluminum foil is only subjected to a process of simply removing a natural oxide film by using sodium hydroxide without a complex pretreatment process and electrochemical polishing, a strong cooling system is not needed, the electrolyte do not need to be stirred, and under a normal temperature, the large-area high-order porous anodised aluminium film rapidly and stably grows with the growth speed rate reaching 4mu m.min<-1>.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a method for preparing a porous anodic aluminum oxide film, in particular to a simple and rapid electrochemical preparation method for an anodic aluminum oxide film with a large-area highly ordered nanopore array structure. Background technique [0002] Porous anodized aluminum (PAA) membrane is a self-assembled hexagonal close-packed nanopore array structure, which has the advantages of simple preparation process, low cost, controllable pore size, high pore density, and easy chemical dissolution by acid or alkali. . In recent years, using PAA as a template, combined with methods such as electrochemical deposition, chemical polymerization, chemical vapor deposition, sol-gel and electrophoretic deposition have successfully synthesized and assembled metals, alloys, nonmetals, polymers and other substances. Nanotubes, nanowires and quantum dot arrays. This kind of template ...

Claims

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Application Information

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IPC IPC(8): C25D11/06
Inventor 宋晔朱绪飞叶秋梅蒋龙飞
Owner NANJING UNIV OF SCI & TECH
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