Preparation method of self-dropping nano-porous anodic alumina membrane

An anodized aluminum, nanoporous technology, applied in anodizing, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problem that the growth rate of porous aluminum oxide film is only limited, the porous anodized aluminum template is easily damaged, and it is not easy to separate metal copper. and other problems, to achieve the effect of fast and efficient demoulding, convenient and efficient production, and high production efficiency

Inactive Publication Date: 2013-10-30
夏天
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  • Application Information

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Problems solved by technology

[0005] Using sulfuric acid, oxalic acid or phosphoric acid as the electrolyte, the anodization practice performed near the optimum value of the oxidation voltage is called mild anodization, or MA, and its disadvantage is that the growth rate of the porous aluminum oxide film is only 2 μm / h, slow production speed and low production efficiency
In addition, after the anodic oxidation reaction is completed, a mixed solution of cuprous chloride and hydrochloric acid is usually used to detach the porous anodized film from the aluminum substrate. After the reaction, the porous anodized aluminum template is easily damaged and is extremely difficult to react. Separation, high cost of separation, and low yield

Method used

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Examples

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preparation example Construction

[0020] The preparation method of the self-detaching nanoporous anodic aluminum oxide film disclosed in the present invention includes the following steps:

[0021] A. Perform constant current electrochemical polishing on the annealed aluminum sheet, the current is 10mA, the polishing time is 20-40s, and the solution is 1.00mol / L NaOH solution, and then the aluminum sheet is immersed in deionized water for ultrasonic cleaning for 10s;

[0022] B. Place the polished aluminum sheet in step A in a constant current oxidation cell, the current intensity is 10-40mA, the electrolysis time is 1h-3h, the electrolyte is 0.5-1.5mol / L sulfuric acid solution, and the electrolysis environment is an ice water bath , Electromagnetic stirring;

[0023] C. After the reaction in step B, the cathode and anode of the electrode are reversely connected, and the constant current is unchanged to continue electrolysis, and the electrolysis time is 40-60s;

[0024] D. The anodic aluminum oxide sheet obtained in ...

Embodiment 1

[0030] Example 1. Perform constant current electrochemical polishing on the annealed aluminum sheet, the current is 10mA, the polishing time is 20s, the polishing liquid is 1.00mol / L NaOH solution, and then the aluminum sheet is rinsed with deionized water and immersed in it Perform ultrasonic cleaning in ionized water for 10 seconds; place the polished aluminum sheet in a constant current oxidation cell, turn on the power supply, the current intensity is 10mA, the electrolysis time is 1h, the electrolyte is 0.5mol / L sulfuric acid solution, and the electrolysis environment is Ice water bath, electromagnetic stirring, stirring rate 40round / min; after the anodizing reaction, reversely connect the cathode and anode of the circuit, reconnect the power supply, constant current intensity 10mA, electrolysis time 40s; immerse the obtained anodized aluminum oxide sheet in deionized water Ultrasonic washing for 20s, then air dry naturally. The scanning tunnel electron microscope of the s...

Embodiment 2

[0031] Example 2. The annealed aluminum sheet was subjected to constant current electrochemical polishing, the current size was 10mA, the polishing time was 25s, and the polishing solution was 1.00mol / L NaOH solution. Then the aluminum sheet was rinsed with deionized water and immersed in it. Perform ultrasonic cleaning in ionized water for 10 seconds; place the polished aluminum sheet in a constant current oxidation cell, turn on the power source, the current intensity is 20mA, the electrolysis time is 2h, the electrolyte is 1.0mol / L sulfuric acid solution, and the electrolysis environment is Ice water bath, electromagnetic stirring, stirring rate 60round / min; after the anodizing reaction, reversely connect the cathode and anode of the circuit, reconnect the power supply, constant current intensity 20mA, electrolysis time 50s; immerse the obtained anodized aluminum oxide sheet in deionized water Ultrasonic washing for 20s, then air dry naturally. The scanning tunnel electron m...

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Abstract

The invention discloses a preparation method of a self-dropping nano-porous anodic alumina membrane, wherein an electrochemically polished aluminum sheet is prepared to a dense porous nano alumina template by utilizing sulfuric acid as electrolyte, a nano-porous anodic alumina template is prepared by constant current electrolytic oxidation, the oxidation efficiency is high, alumina nanopores on the template are orderly and trimly arranged, the quality of the template is good and the product is trim. The technical problem to be solved in the invention is to improve the preparation maneuverability and demolding efficiency of the nano-porous alumina template, the constant current oxidization preparation manner is used for effectively reducing the preparation difficulty and improving the oxidization efficiency, the template growth speed is as high as 3-5 micron / h, the nanopore arrays are uniformly distributed, the template quality is high, and meanwhile, a reverse electrode gas hedge manner is used for quickly and efficiently demolding the template so as to ensure convenient and efficient production.

Description

[0001] Technical field [0002] The invention relates to the preparation of a nano template, in particular to a preparation method of a self-detaching nano porous anodic aluminum oxide film. Background technique [0003] Aluminum is a relatively active metal. It can form an oxide film with a thickness of several hundred nanometers in the air. This oxide film is amorphous, thin and porous, and has low mechanical strength. It cannot meet the requirements of functional applications. The aluminum oxide film with special functions must be treated on the aluminum surface. The aluminum is used as an anode for electrolytic treatment. An oxide film is formed on the aluminum surface and becomes aluminum anodized. Anodized aluminum film is divided into barrier type and porous type. Anodizing in a neutral electrolyte can obtain a dense barrier oxide film, while oxidation in an acidic electrolyte with a certain oxidizing ability such as oxalic acid, phosphoric acid, and sulfuric acid can o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06C25D11/20
Inventor 夏天
Owner 夏天
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