Method for preparing ordered macroporous anodic alumina film by two-step anodic oxidation

An anodic oxidation method, anodic oxidation technology, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of poor order, complicated cost, difficult to achieve experimental conditions, etc., to avoid ablation Phenomenon, low cost, effect of improving orderliness
CN103243370AInactive Publication Date: 2013-08-14DONGHUA UNIV
7 Cites 16 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DONGHUA UNIV
Publication Date
2013-08-14
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a method for preparing an ordered macroporous anodic alumina film by two-step anodic oxidation. The method comprises the following steps of: carrying out hard anodizing on aluminum which is subjected to high temperature annealing, ultrasound deoiling and electrochemical polishing treatments in modified oxalic acid electrolyte, so as to obtain a porous anodic alumina film; removing an irregular porous alumina layer which is formed after first anodic oxidation by using a mixed solution of chromic acid and phosphoric acid; then carrying out second anodic oxidation, namely carrying out mild anodic oxidation on the aluminum sheet with the alumina film removed in the modified phosphate electrolyte in a constant voltage manner, wherein the voltage in the second anodic oxidation is completely the same as the voltage in the first anodic oxidation; and finally chambering the test sample subjected to anodic oxidation in a phosphoric acid solution to obtain the ordered macroporous anodic alumina film. The preparation method is carried out under an ice-water bath condition without the requirement on a very low temperature or a high voltage; the cost of used raw materials is low; and equipment is simple and is convenient to operate and easy to control, and therefore the method has a bright application prospect in the modern industry and high and new technology field.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of preparation of aluminum oxide films, in particular to a method for preparing ordered macroporous anodized aluminum oxide films by a two-step anodic oxidation method. Background technique

[0002] For nearly fifty years, Porous Anodic Alumina has been widely studied and applied in various industrial production and scientific research fields. From a structural point of view, the micropore distribution of the porous anodized aluminum layer is highly ordered, showing a hexagonal close-packed periodic structure. The columnar channels are perpendicular to the aluminum substrate and parallel to each other. The pore diameter, pore spacing, and film thickness can be adjusted within a certain range. , the hole density can reach 10 9 ~10 10 / cm 2 , These structural characteristics of porous anodized aluminum and its unique functional characteristics have aroused great interest among scholars, and researchers at home and ab...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More