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Preparation method of porous anodic aluminum oxide film

A technology of aluminum oxide film and porous anode, which is applied in anodizing, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problems affecting the order degree of porous anodized aluminum oxide film, long anodizing time, and poor order degree of oxide film. and other problems, to achieve the effect of shortening the production cycle, low cost and large scope

Active Publication Date: 2013-07-31
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this method are: (1) the anodic oxidation time is longer, which leads to the production cycle; (2) the order degree of the oxide film produced by the first oxidation is poor, which affects the order degree of the final porous anodized aluminum oxide film

Method used

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  • Preparation method of porous anodic aluminum oxide film
  • Preparation method of porous anodic aluminum oxide film
  • Preparation method of porous anodic aluminum oxide film

Examples

Experimental program
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Effect test

Embodiment 1）

[0017] The preparation method of the porous anodic aluminum oxide membrane of the present embodiment has the following steps:

[0018] ① Pretreatment of pure aluminum surface:

[0019] First, soak pure aluminum in absolute ethanol for 5 minutes to remove oil stains from surface machining. Then, wash the pure aluminum with clean water to remove dust and dirt on the surface of the pure aluminum. Next, the pure aluminum washed with water was placed in an alkaline solution at 60° C. for 30 seconds, thereby removing the natural thin oxide layer on the surface of the pure aluminum. The alkaline solution was an aqueous solution containing 20 g of sodium hydroxide per liter. Next, take out the pure aluminum and wash it with water again, and place it in a dilute nitric acid solution with a volume percentage of 25% for 30 seconds. Finally, the pure aluminum was taken out and ultrasonically cleaned with deionized water for 5 min.

[0020] ② Put the pure aluminum pretreated in step ① a...

Embodiment 2～ Embodiment 4）

[0029] The preparation method of each embodiment is basically the same as that of Example 1, and the differences are shown in Table 1.

[0030] Table 1

[0031]

[0032]

[0033] .

Embodiment 5）

[0035] The preparation method of this embodiment is basically the same as that of Example 1, except that step ②: the pure aluminum after step ① pretreatment is used as the anode and put into the electrochemical polishing solution together with graphite as the cathode, at a voltage of 20V Electrochemical polishing was carried out for 30 s to form a nanoscale porous film on the surface of pure aluminum.

[0036] The above electrochemical polishing solution is composed of absolute ethanol and perchloric acid in a weight ratio of 4:1.

[0037] The scanning electron microscope picture of the surface of the porous anodized aluminum oxide film prepared in this embodiment is shown in image 3 , pore size distribution diagram see Figure 4 ,Depend on image 3 and Figure 4 It can be seen that the pore size distribution of the porous anodized aluminum oxide membrane prepared in this example is slightly worse, the porosity is only about 5%, and the average pore size is 80nm.

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Abstract

The invention discloses a preparation method of a porous anodic aluminum oxide film, which comprises the following steps: (1) pretreating the surface of pure aluminum; (2) electropolishing the pretreated pure aluminum, wherein the electropolishing solution is composed of 1,2-propanediol and perchloric acid according to a volume ratio of (9:1)-(2:1); (3) removing a nano-level porous film layer on the surface of the pure aluminum; (4) performing anodic oxidation for 1-5 hours; and (5) cleaning and drying. According to the invention, the nano-level porous film layer is formed on the surface of the pure aluminum through electropolishing by selecting the appropriate electropolishing solution and appropriate electropolishing conditions, thus greatly shortening the production cycle. Besides, a highly-ordered porous anodic aluminum oxide film can be finally obtained according to the invention.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a preparation method of a porous anodic aluminum oxide film. Background technique [0002] Aluminum is a relatively active metal. It can naturally 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, which cannot meet the requirements of functional applications. [0003] In order to obtain an oxide film layer with special functions, the aluminum surface must be treated, usually in an electrolyte, using aluminum as an anode for electrolytic treatment, so as to obtain an oxide film on the aluminum surface. According to different electrolytes, dense (or barrier) anodized aluminum oxide film and porous anodized aluminum oxide film can be obtained respectively. The dense (or barrier) anodized aluminum oxide film is obtained by anodizing aluminum in a ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08C25D11/16
CPCC25D11/16C25F3/20
Inventor 马迪李树白陈海云
Owner JIANGSU UNIV OF TECH
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