Method for preparing highly ordered porous anodic alumina films in superhigh speed

A technology of porous alumina and porous anode, used in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve problems such as difficult large-scale industrial production, electric field burnout, increased voltage, etc., to improve reaction activity, increase Overall conductivity, effect of increasing temperature

Inactive Publication Date: 2010-02-24
JIANGSU POLYTECHNIC UNIVERSITY
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  • Abstract
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Problems solved by technology

[0010] However, it must be pointed out that both the hard anodizing of Woo Lee et al. and the high-field anodizing of Li YB et al. require complex pretreatment processes, low-speed anodizing before high-speed oxidation, and gradually increasing the voltage, especially requiring very low If the voltage and temperature are increased, the electric field is likely to concentrate on some points and burn (Burning effects), so these high-speed anodizing processes are still difficult to apply to large-scale industrial production

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  • Method for preparing highly ordered porous anodic alumina films in superhigh speed
  • Method for preparing highly ordered porous anodic alumina films in superhigh speed
  • Method for preparing highly ordered porous anodic alumina films in superhigh speed

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Embodiment Construction

[0028] Further illustrate content of the present invention below in conjunction with example:

[0029] Case number one:

[0030] Purity 99.999% thickness 200μm area 40cm 2 The high-purity aluminum foil is soaked in acetone for 10 minutes, rinsed with deionized water, and then directly put into the electrolytic cell as the anode, with the graphite plate as the cathode, and the ratio of the cathode area to the anode area is 2:1. The electrolyte consists of 1.0M oxalic acid, 0.8M aluminum sulfate and 0.05M ethylene glycol. The electrolysis voltage is 30V. The total volume of the electrolyte in the electrolytic cell is two liters. The electrolytic cell is placed in a 5L constant temperature water bath. Set the temperature at 25°C. The anodic oxidation time is 15 minutes. After cleaning, put it into a mixture of 6.0% by weight phosphoric acid and 1.8% by weight chromic acid at 60° C. for 30 minutes, take it out for cleaning and set aside.

[0031] The aluminum foil after the pri...

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Abstract

The invention discloses a method for preparing highly ordered porous anodic alumina films in superhigh speed, relating to the application fields including the surface treating field of nonferrous metal and the preparation and application field of new materials in nanometer structures. Aluminum materials are used as anodes without high-temperature annealing or chemical polishing, a mixed solution containing oxalic acid, aluminum sulfate and ethylene glycol is used as an improved oxalic acid electrolyte system, the primary electrolysis is performed in the common technology, the secondary electrolysis is performed at the electrolyte temperature of 25 to 65 DEG C and under the direct-current electrolytic voltage of 30 to 50V after an oxide layer formed by the primary electrolysis is removed, and then the superhigh-speed growing method of porous anodic alumina films is directly realized; the growing speed is from 20 to 200 mum/h and is 10 to 50 times higher than that of the common technology for preparing the highly ordered porous anodic alumina films. The method does not need complicated thermal annealing and polishing, low-temperature requirements or high voltage and only needs a common water bath to stably prepare the highly ordered porous anodic alumina films in superhigh speed in a very wide temperature range.

Description

technical field [0001] The invention relates to an ultra-high-speed method for preparing highly ordered porous anodic aluminum oxide films, which belongs to the technical field of metal surface treatment, and its application fields include the field of surface treatment of non-ferrous metals and the field of preparation and application of new nanostructure materials. Background technique [0002] Porous anodized aluminum is not only very important for the surface treatment of aluminum metal, but also an important template for the preparation and assembly of nanostructured materials. At present, the most popular and important application of porous anodized aluminum template is to use porous anodized aluminum template to obtain quantum dots, nanodots, nanowires, nanotubes, nanopores and various composite nanostructures of different materials, and further assemble and Device research. In addition, because of the ordered pore array structure of porous anodized aluminum, it can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/12
Inventor 丁建宁丁古巧袁宁一杨蓉
Owner JIANGSU POLYTECHNIC UNIVERSITY
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