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A method for preparing ordered large structural unit aluminum oxide film

A technology of aluminum oxide film and large structure, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of high order and large structural unit size, current density and low electrolytic voltage of aluminum oxide film, etc. problem, to achieve the effect of fast film formation, good repeatability, and improved feasibility

Inactive Publication Date: 2016-10-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the constant current density electrolysis process currently used can suppress the occurrence of breakdown, its current density and electrolysis voltage are usually low, and it is difficult for the prepared alumina film to take into account both high order and large structural unit size.

Method used

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  • A method for preparing ordered large structural unit aluminum oxide film
  • A method for preparing ordered large structural unit aluminum oxide film
  • A method for preparing ordered large structural unit aluminum oxide film

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0025] A method for preparing an ordered large structural unit aluminum oxide film, comprising the steps of:

[0026] (1) Clean the high-purity aluminum flakes with a mass fraction ≥99.99% in absolute ethanol and deionized water in sequence to obtain clean aluminum flakes;

[0027] (2) With the clean aluminum sheet obtained in step (1) as the anode and the graphite as the cathode, perform electrochemical polishing at 18V in a mixed solution of perchloric acid and absolute ethanol with a volume ratio of 1:4 at 0°C to obtain Polished aluminum sheet;

[0028] (3) The polished aluminum sheet obtained in step (2) is used as the anode, the graphite is used as the cathode, and the volume ratio of solution A (0.28mol / L oxalic acid aqueous solution) and solution B (absolute ethanol) is A:B=500. solution to carry out anodizing process, the temperature is 5°C: linearly increase the voltage at a rate of 0.5V / s until the current density reaches 295A / m 2 After entering the constant curren...

Embodiment 2

[0032] A method for preparing an ordered large structural unit aluminum oxide film, comprising the steps of:

[0033] (1) Clean the high-purity aluminum flakes with a mass fraction ≥99.99% in absolute ethanol and deionized water in sequence to obtain clean aluminum flakes;

[0034] (2) With the clean aluminum sheet obtained in step (1) as the anode and the graphite as the cathode, perform electrochemical polishing at 21V in a mixed solution of perchloric acid and absolute ethanol with a volume ratio of 1:4 at 3°C ​​to obtain Polished aluminum sheet;

[0035] (3) The polished aluminum sheet obtained in step (2) is used as the anode, the graphite is used as the cathode, and the volume ratio of solution C (0.3mol / L oxalic acid aqueous solution) and solution B (absolute ethanol) is C:B=500. solution to carry out anodizing process, the temperature is 0°C: linearly increase the voltage at a rate of 1V / s until the current density reaches 505A / m 2 After entering the constant current...

Embodiment 3

[0040] A method for preparing an ordered large structural unit aluminum oxide film, comprising the steps of:

[0041] (1) Clean the high-purity aluminum flakes with a mass fraction ≥99.99% in absolute ethanol and deionized water in sequence to obtain clean aluminum flakes;

[0042] (2) With the clean aluminum sheet obtained in step (1) as the anode and the graphite as the cathode, perform electrochemical polishing at 23V in a mixed solution of perchloric acid and absolute ethanol with a volume ratio of 1:4 at 5°C to obtain Polished aluminum sheet;

[0043] (3) The polished aluminum sheet obtained in step (2) is used as the anode, the graphite is used as the cathode, and the volume ratio of solution D (0.32mol / L oxalic acid aqueous solution) and solution B (absolute ethanol) is D: B=3. solution to carry out anodizing process, the temperature is 0°C: linearly increase the voltage at a rate of 2V / s until the current density reaches 298A / m 2 Then enter the constant current densi...

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Abstract

The invention discloses a method for preparing an ordered macrostructure unit alumina membrane. The method comprises the steps of cleaning a high-purity aluminum sheet, and then performing electrochemical polishing; performing electrolysis by taking the polished aluminum sheet as an anode, taking graphite as a cathode and taking an added oxalic acid solution of ethanol as electrolyte, performing linear boosting till the current avalanche phenomenon due to dramatic increases in current, then performing electrolysis under constant large current density till a voltage stable stage, and then, stopping electrolysis; soaking in a saturated copper chloride solution to obtain the ordered macrostructure unit alumina membrane. According to the method disclosed by the invention, the size of the prepared alumina membrane structure unit can be controlled by controlling the adding proportion of the ethanol and the current density, and the prepared alumina membrane has a relatively large structure unit and an adjustable size, is highly ordered in arrangement, and can be used as a template for synthesizing various functional nano and submicro-materials. The method disclosed by the invention has the advantages of low cost, high controllability, good repeatability and the like, and the feasibility of applying the method in production is further improved.

Description

technical field [0001] The invention relates to an aluminum oxide film with an ordered large structural unit, in particular to a method for preparing an aluminum oxide film with a large structural unit and a highly ordered arrangement of the structural units by using an electrolytic process of aluminum, and belongs to the technical field of material preparation. Background technique [0002] By controlling the electrolysis conditions, an aluminum oxide film composed of ordered hexagonal structural units can be prepared by electrolytic method, and each structural unit contains a pore channel, forming a honeycomb-like porous structure. Compared with porous polymer membranes, colloidal crystal membranes and other membranes, porous alumina membranes have many advantages such as adjustable pore size and spacing, uniform and straight pore channels, good order of pore structural units, and high thermal and chemical stability. Advantages, it has become one of the preferred templates...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/10C25D11/24
Inventor 李屹覃玉燕凌志远
Owner SOUTH CHINA UNIV OF TECH