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Preparation method of aluminum or aluminum alloy super-hydrophobic surface

A super-hydrophobic surface, aluminum alloy technology, applied in the direction of anodic oxidation, etc., to achieve the effect of low temperature requirements, reduced preparation time, and simple method

Inactive Publication Date: 2013-09-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method utilizes anodic oxidation method to prepare superhydrophobic surface on aluminum or aluminum alloy surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Use ethanol and deionized water to ultrasonically clean the substrate (20mm×10mm×1.5mm) of the aluminum alloy sheet (the aluminum content is 98%, and the rest is magnesium, silicon, etc.) to remove grease and impurity ions on the aluminum alloy sheet;

[0018] 2. Use 0.3M oxalic acid aqueous solution for the aluminum alloy sheet cleaned in the previous step as the electrolyte, the aluminum sheet as the anode, and the graphite sheet as the cathode, in a water bath at 30°C, and pass a constant current density of 0.5A / cm 2 , anodized for 12 minutes. Then clean the aluminum alloy sheet with ethanol and deionized water, and dry it;

[0019] 3. Immerse the aluminum alloy sheet after the anodic oxidation treatment in the previous step for 30 minutes in 1 wt% fluorosilane ethanol solution, and then keep it at 120° C. for 2 hours to obtain a super-hydrophobic surface. The contact angle of water droplets on the aluminum surface is 156°.

Embodiment 2

[0021] 1. Use ethanol and deionized water to ultrasonically clean the aluminum sheet substrate (20mm×10mm×1.5mm) in order to remove grease and impurity ions on the aluminum sheet;

[0022] 2. Use 0.3M oxalic acid aqueous solution as the electrolyte for the aluminum sheet cleaned in the previous step, use the aluminum sheet as the anode, and the graphite sheet as the cathode, in a water bath at 40°C, pass a constant current of 1.5A / cm 2 , anodized for 4 minutes. Then clean the aluminum sheet with ethanol and deionized water, and dry it;

[0023] 3. Immerse the aluminum sheet after the anodic oxidation treatment in the previous step in 0.5-1wt% fluorosilane ethanol solution for 20 minutes, and keep it warm at 110° C. for 2.5 hours to obtain a super-hydrophobic surface. The contact angle of water droplets on the aluminum surface is 157°.

Embodiment 3

[0025] 1. Use ethanol and deionized water to ultrasonically clean the aluminum sheet substrate (20mm×10mm×1.5mm) in order to remove grease and impurity ions on the aluminum sheet;

[0026] 2. Use 0.3M oxalic acid aqueous solution for the aluminum sheet cleaned in the previous step as the electrolyte, the aluminum sheet as the anode, and the graphite sheet as the cathode, in a water bath at room temperature, and pass a constant current density of 1.0A / cm 2 , anodized for 4 minutes. Then clean the aluminum sheet with ethanol and deionized water, and dry it;

[0027] 3. Immerse the aluminum sheet after the anodic oxidation treatment in the previous step in 0.5-1wt% fluorosilane ethanol solution for 20 minutes, and keep it warm at 120° C. for 2 hours to obtain a super-hydrophobic surface. The contact angle of water droplets on the aluminum surface is 158°.

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Abstract

The invention relates to a preparation method of aluminum or aluminum alloy super-hydrophobic surface. The method comprises the followings: using ethanol and deionized water sequentially to ultrasonically cleaning an aluminum or an aluminum alloy piece; taking oxalic acid aqueous solution as electrolyte, an aluminum or aluminum alloy piece as an anode, and graphite as a cathode, carrying out oxidation in electrifying and water bathing, constructing a pyramidal surface with a micro-nano composite structure in one step, then cleaning the aluminum or aluminum alloy piece again, and drying; and decorating the aluminum or aluminum alloy piece after anode oxidation by adopting a low surface energy material, and then drying, namely the super-hydrophobic surface is obtained. By adopting the anode oxidation technology, a duality composite structure with a pyramidal micron structure and a nanowire can be constructed under high current in one step, the method used is simple and convenient, the technology is mature, and the preparation time is reduced greatly; and temperature requirements for anode oxidation are very low, and the preparation can be performed under low temperature and constant-temperature conditions. The contact angle of the prepared super-hydrophobic surface to water can reach more than 155 degrees.

Description

technical field [0001] The invention relates to a super-hydrophobic surface preparation technology, in particular to a method for preparing a super-hydrophobic surface of aluminum or aluminum alloy. Background technique [0002] Since the discovery of the "lotus leaf effect", superhydrophobic surfaces have attracted worldwide attention. The droplet contact angle of the superphobic surface is greater than 150°, and the rolling angle is less than 5°. The current research results show that superhydrophobicity is mainly determined by the two factors of surface roughness and surface energy. Since the smooth surface with the lowest surface energy has a contact angle with water of only 119°, it is also necessary to construct a complex and rough surround structure on the surface. The smaller the contact area between the protrusions on the surface and the droplet, the better the hydrophobicity and the larger the contact angle. [0003] The surface with "lotus leaf effect" has func...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04
Inventor 张海峰刘晓为王锋汪洋陈楠
Owner HARBIN INST OF TECH
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