Preparation method of through-hole anodic aluminum oxide template

An anodic oxidation of aluminum and anodic oxidation technology, applied in the field of electrochemistry, can solve the problems of complex removal process of barrier layer, difficult operation, and difficult control of opening size, so as to avoid corrosion process of barrier layer removal, avoid pollution and environment Contamination, the effect of improving the production efficiency

Inactive Publication Date: 2014-12-24
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has requirements for the thickness and properties of the PAA film layer, and it is difficult to control the size of the openings on one side of the PAA film barrier layer, the operation is very difficult, the electrolyte is not environmentally friendly, and the shape and size of the film pores may be damaged.
[0005] In summary, the current methods for preparing PAA through-hole templates have various defects, such as: heavy metal impurity contamination, complex and time-consuming process for removing barrier layers, difficulty in controlling the size of openings, and unenvironmental protection of the electrolyte, etc.

Method used

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  • Preparation method of through-hole anodic aluminum oxide template
  • Preparation method of through-hole anodic aluminum oxide template
  • Preparation method of through-hole anodic aluminum oxide template

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Embodiment 1

[0034]First, take two strips of aluminum foil with a purity of 99.99%, a length of 70 mm, a width of 20 mm, and a thickness of 150 μm, and put 2 wt%, 70 ° C in NaOH solution for 2 min to remove the natural oxide film on the surface of the aluminum foil. Two pieces of aluminum foil were overlapped and fixed in the mold, and then the mold was put into a hydraulic press, pressurized at 10 MPa, and maintained for 30 min. Then take out the double-layer composite aluminum foil that has been bonded, rinse it repeatedly with deionized water, and use it as the anode for anodic oxidation, and then use the platinum mesh as the cathode. With 0.75 M oxalic acid solution as the electrolyte, at 50 mA cm -2 The current density (high field anodization) at a constant temperature of 20 ° Under C, single-sided constant current anodizing is carried out. The oxidation time is determined by measuring the change of voltage in real time. When the voltage rises rapidly, the current is halved, and it...

Embodiment 2

[0036] First, take two strips of aluminum foil with a purity of 99.99%, a length of 70 mm, a width of 20 mm, and a thickness of 150 μm, and put 2 wt%, 70 ° C in NaOH solution for 2 min to remove the natural oxide film on the surface of the aluminum foil. Two pieces of aluminum foil were overlapped and fixed in the mold, then the mold was put into the hydraulic press, pressurized at 5 MPa, and maintained for 60 min. Then take out the double-layer composite aluminum foil that has been bonded, rinse it repeatedly with deionized water, and use it as the anode for anodic oxidation, and then use the platinum mesh as the cathode. With 0.75 M oxalic acid solution as the electrolyte, at 50 mA cm -2 The current density at a constant temperature of 20 ° Under C, single-sided constant current anodizing is carried out. The oxidation time was determined by measuring the change of the voltage in real time. When the voltage rose rapidly, the current was halved and kept for 30 min before st...

Embodiment 3

[0038] Firstly, take a strip of aluminum foil with a purity of 99.99%, a length of 70 mm, a width of 20 mm, and a thickness of 150 μm and 100 μm, respectively, and put 2 wt%, 70 ° C in NaOH solution for 2 min to remove the natural oxide film on the surface of the aluminum foil. Two pieces of aluminum foil were overlapped and fixed in the mold, and then the mold was put into a hydraulic press, pressurized at 10 MPa, and maintained for 30 min. Then take out the bonded double-layer composite aluminum foil, rinse it repeatedly with deionized water, use the side of the aluminum foil with a thickness of 100 μm as the anode for anodic oxidation, and then use the platinum mesh as the cathode. With 0.75 M oxalic acid solution as the electrolyte, at 50 mA cm -2 The current density at a constant temperature of 20 ° Under C, single-sided constant current anodizing is carried out. The oxidation time was determined by measuring the change of the voltage in real time. When the voltage ros...

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Abstract

The invention discloses a preparation method directly producing a barrier-free through-hole anodic aluminum oxide template during anodizing. According to extensibility of metallic aluminum and the diffusion principle of intermetallic interface, double aluminum foil layers are laminated by pressurizing. The first aluminum foil layer is completely oxidized by single-side anodizing and reaches the second aluminum foil layer, so that a fully through-hole first porous anodic aluminum oxide film. The aluminum oxide template with 100% through holes can be obtained by the preparation method, and the need of using complex post-treatment process to remove a barrier layer is avoided. Through-hole time points can be precisely positioned according to anodizing curves. The thickness of the through-hole aluminum oxide template can be controlled by regulating thickness of the first aluminum foil layer or by double anodizing. The preparation method is applicable to the process of mild anodizing and high-field anodizing of aluminum foils in various aqueous electrolytes.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a method for preparing a through-hole porous anodized aluminum template, in particular to a method for obtaining a double-layer composite aluminum foil without a barrier layer by only anodizing on one side without special post-treatment. Facile electrochemical preparation of through-hole anodized alumina templates. Background technique [0002] Porous anodized aluminum (PAA) is a kind of porous material obtained by electrochemical anodization in a suitable electrolyte, with regular pore arrangement and hexagonal close-packed cells. As a nano-template material, PAA has the characteristics of simple preparation process, high pore density, large aspect ratio, regular pore arrangement, and controllable pore size. It is widely used in metals, alloys, non-metals, non-metal oxides, polymers, etc. The preparation of low-dimensional nanostructures of various materials has broad ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/04C25D11/12
Inventor 宋晔朱绪飞蒋龙飞杨斌
Owner NANJING UNIV OF SCI & TECH
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