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High-speed preparation method of extra small bore diameter porous anodized aluminium film

A technology of aluminum oxide film and porous anode, applied in the field of metal surface treatment technology and nanotechnology, can solve problems such as low growth rate, and achieve the effects of simple preparation process, improved efficiency and increased electrical conductivity

Inactive Publication Date: 2011-11-16
CHANGZHOU UNIV
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Problems solved by technology

In the academic paper "Fabrication of Porous Anodic Alumina with Ultrasmall Nanopores, 2010, Nanoscale Res. Lett." submitted in 2010, we studied in detail the ultra-small pore PAA prepared by different anodic oxidation at different low voltages 1-10V. The experimental results also show that although regular ultra-small pore PAA can be obtained, the growth rate is very low

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  • High-speed preparation method of extra small bore diameter porous anodized aluminium film
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  • High-speed preparation method of extra small bore diameter porous anodized aluminium film

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[0023] Further illustrate content of the present invention below in conjunction with example:

[0024] Case number one:

[0025] In the first step, the purity is 99.999%, the thickness is 200μm, and the area is 4cm 2 The high-purity aluminum foil is soaked in acetone for 10 minutes, rinsed with deionized water, and then directly put into the electrolytic cell as the anode, with the graphite plate as the cathode, and the ratio of the cathode area to the anode area is 2:1. The electrolyte consists of 1.0M sulfuric acid, 0.8M aluminum sulfate and 20% ethanol, the electrolysis voltage is 5V, the total volume of the electrolyte in the electrolytic cell is two liters, the electrolytic cell is placed in a 5L constant temperature water bath, and the temperature of the constant temperature water bath is set at 10°C. The anodic oxidation time is 1 hour. After cleaning, put it into the mixed solution of 6.0% by weight phosphoric acid and 1.8% by weight chromic acid at 60°C for 90 minut...

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Abstract

The invention relates to a high-speed preparation method of an extra small bore diameter porous anodized aluminium film, belonging to the fields of a metal surface treatment technology and a nanotechnology. An extra small bore diameter PAA (Porous Anodized Aluminium) film is prepared on the surface of an aluminum sheet at high speed by a three-time new anodic oxidation process. In the first-time anodic oxidation, the voltage is 1-10V, the temperature is controlled to be 0-60 DEG C, the electrolysis time is 30 minutes to 2 hours, and a sample is washed with deionized water; a porous alumina layer formed by the first-time anodic oxidation is removed by chemical corrosion; in the step two, the electrolysis process is same as that of the step one, the electrolysis time is 5 seconds to 60 minutes, and then a protecting layer is formed; in the third time anodic oxidation, the voltage is 20-100 V, and the temperature is kept at 0-60 DEG C. The bore diameter of the extra small bore diameter PAA prepared with the method is less than 20 nm, the growth rate is 4-250 mu m / h and is 20-250 times that of the common processes. The three-time anodic oxidation process does not need complicated preindenting and polishing, has low requirements on temperature control, and has good stability, high preparation rate and shorter reaction time.

Description

technical field [0001] The invention relates to a high-speed preparation technology of an ultra-small-aperture porous anodic aluminum oxide film, which belongs to the field of metal surface treatment technology and nanotechnology, and its application fields include non-ferrous metal surface treatment and preparation and application of nanostructure new materials. Background technique [0002] Porous anodic oxide aluminum, Porous Anodic Alumina, PAA, is not only very important for the surface treatment of aluminum metal, but also an important template for the preparation and assembly of nanostructured materials. The pore size of the currently reported anodized aluminum oxide membranes is usually in the range of 20-500 nm. According to the literature "H.Chik and J.M.Xu, Mater.Sci.Eng.R 43(2004) 10", common processes include: 1). 0.3M sulfuric acid electrolyte, temperature -20 to 5°C, anodic oxidation voltage 25V, 2) 0.3M oxalic acid electrolyte, temperature 0-20 ℃, anodic oxi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/12
Inventor 丁古巧丁建宁袁宁一杨蓉朱媛媛
Owner CHANGZHOU UNIV
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