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Toughness porous anodic aluminium oxide film and preparation method thereof

A technology of alumina membrane and porous anode, applied in the fields of electrochemistry and material chemistry, can solve the problem of difficult to prepare large area, and achieve the effect of uniform pore size distribution, simple steps and good toughness

Inactive Publication Date: 2007-02-28
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the above methods are difficult to prepare large-area, high-toughness anodized aluminum films suitable for practical applications, so solving the brittleness of anodized aluminum films has practical significance

Method used

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  • Toughness porous anodic aluminium oxide film and preparation method thereof
  • Toughness porous anodic aluminium oxide film and preparation method thereof
  • Toughness porous anodic aluminium oxide film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0011] Example 1: After degreasing an aluminum sheet with acetone, soak it in 1% NaOH for 12 minutes, wash it with deionized water and put it in H2O with a volume ratio of 5:4:1. 3 PO 4 :H 2 SO 4 : HNO 3 Chemically polish for 3 minutes at 80°C in mixed acid, take it out and rinse it with deionized water, put it into 0.3mol / l sulfuric acid, aluminum sheet as anode, platinum wire as cathode, 10V, single-side oxidation at 25°C for 3 hours, and vigorously stir at the same time . The anodized film is used as the anode again, the platinum wire is still the cathode, and the electrolyte is 1% hydrochloric acid and 5g / l ferric chloride.

[0012] The aluminum substrate on the other side of the film is exposed to the electrolyte for single-sided electrolysis, the electrolysis time is 9min, the temperature is 25°C, and the current density is 0.4A / cm 2 . Soak in 6% phosphoric acid for 30 minutes at 30°C to remove the barrier layer. A porous anodized aluminum oxide film with toughnes...

Embodiment 2

[0013] Example 2: Take an aluminum sheet and degrease it with acetone, soak it in 5% NaOH for 8 minutes, wash it with deionized water and put it into H2O with a volume ratio of 5:4:1 3 PO 4 :H 2 SO 4 : HNO 3 Chemically polish at 80°C for 3 minutes in mixed acid, take it out and rinse it with deionized water, put it into 0.5mol / l oxalic acid, aluminum sheet as anode, platinum wire as cathode, 40V, single-side oxidation at 0°C for 5 hours, and vigorously stir at the same time . The anodized film is used as the anode again, the platinum wire is still the cathode, the electrolyte is 4% hydrochloric acid and 40g / l ferric chloride, and the aluminum substrate on the other side of the film is in contact with the electrolyte for single-sided electrolysis. 25℃, current density 0.5A / cm 2 . Soak in 3% phosphoric acid for 50 minutes at a temperature of 30°C to remove the barrier layer. A porous anodized aluminum oxide film with toughness penetrating on both sides can be obtained.

Embodiment 3

[0014] Example 3: Take an aluminum sheet and degrease it with acetone, soak it in 8% NaOH for 4 minutes, wash it with deionized water and put it into H2O with a volume ratio of 5:4:1 3 PO 4 :H 2 SO 4 : HNO 3 Chemical polishing at 80°C for 3 minutes in mixed acid, take it out and rinse with deionized water, put it into 0.4mol / l phosphoric acid, aluminum sheet as anode, platinum wire as cathode, 130V, single-side oxidation at 20°C for 1 hour, and vigorously stir at the same time . The anodized film is used as the anode again, the platinum wire is still the cathode, the electrolyte is 3% hydrochloric acid and 20g / l ferric chloride, and the aluminum substrate on the other side of the film is in contact with the electrolyte for single-sided electrolysis. 15℃, current density 0.04A / cm 2 . Soak in 5% phosphoric acid for 40 minutes at a temperature of 30°C to remove the barrier layer. A porous anodized aluminum oxide film with toughness penetrating on both sides can be obtained...

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Abstract

The invention provides the porous anode pellumina and preparing method. The porous anode pellumina is composed by hexagon crystal cells, the bore diameter range is 5-200nm, the bores are parallel, and the bore diameter is distributed homogeneously. The film has good tenacity. The method comprises the following steps: aluminium sheet degreasing, removing the surface oxidate with alkali, then carrying out chemical milling, using aluminum sheet as anode, platinum filament as cathode, carrying out electrolytic oxidation in acide, then film aluminium base is electrolyzed in the electrolytic solution of dilute hydrochloric acid and anhydrous ferric chloride, soaking the film in the phosphoric acid, and getting the product. The film can be used for separating film of hyperfiltration and microfiltration and form board for making functional material and nanometer line.

Description

technical field [0001] The invention belongs to the fields of material chemistry and electrochemistry. Background technique [0002] Porous anodized aluminum membrane is a porous structure composed of hexagonal columnar unit cells with round holes. The pores are parallel to each other, and the channels are perpendicular to the surface of the membrane. The pores have regular apertures, uniform pore size, uniform distribution, and an aspect ratio of 20-20000. The pore size ranges from 5 to 200 nanometers, and the pore size and pore density can be precisely controlled by changing the electrolysis conditions and supplementing with appropriate chemical post-treatment. Utilizing its unique structure, at present, it is mostly used to deposit various substances (such as metals, semiconductors, polymer materials, magnetic materials, etc.) Functional Materials. In addition, it can also make full use of its regular porous structure, good heat resistance, wear resistance, corrosion r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04
Inventor 李淑英常晓仆
Owner DALIAN UNIV OF TECH
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