Method for preparing highly ordered aluminum oxide template by asymmetric two-step anodization

A technology of secondary anodization and alumina template, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problems of limiting and restricting the scope of application, and achieve the effect of realizing modulation and expanding the scope of selection.
CN101831682AInactive Publication Date: 2010-09-15CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2010-09-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for preparing a highly ordered aluminum oxide template by asymmetric two-step anodization, which is characterized by comprising the following steps of: carrying out high-temperature annealing treatment on a highly pure aluminum sheet, and then carrying out electrochemistry polishing treatment, wherein the highly pure aluminum sheet has the purity being larger than or equal to 99.99wt%; anodizing for the first time in electrolyte by taking the highly pure aluminum sheet treated in the last step as the anode and a black lead as the cathode; dipping the highly pure aluminum sheet anodized for the first time into a mixed solution of phosphoric acid and chromic acid so as to remove an oxidation film on the surface of the highly pure aluminum sheet; anodizing for the second time in electrolyte different from the electrolyte for anodizing for the first time to obtain the aluminum oxide template, and then cleaning the aluminum oxide template to obtain the highly ordered aluminum oxide template. The invention widens the range of oxidation voltage for preparing aluminum oxide templates in electrolyte and realizes the modulation on the distance and the aperture between every two template holes to the larger extent.
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Description

technical field

[0001] The invention belongs to the technical field of preparing nanometer mesoporous materials, and relates to a method for preparing highly ordered alumina templates through asymmetric secondary anodic oxidation. technical background

[0002] Aluminum is oxidized under different conditions, and aluminum oxide films with different morphological structures can be obtained. Oxidation in weak solubility (such as boric acid, tartaric acid, etc.) or neutral solution (various neutral salts) can obtain dense alumina film; oxidation in medium solubility solution (such as dilute sulfuric acid, oxalic acid, phosphoric acid, etc.) A porous aluminum oxide film can be obtained; when oxidized in a solution with strong solubility (such as nitric acid, hydrochloric acid, sodium hydroxide, etc.), it is generally difficult to form an aluminum oxide film because the formed oxide is quickly dissolved. Taking advantage of the fact that aluminum can be oxidized in a solution wit...

Claims

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