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Processing method of aluminum and aluminum alloy super hydrophobic surface

A technology of super-hydrophobic surface and production method, which is applied in the field of surface treatment of metal substrates, can solve the problems of long treatment time of NaOH aqueous solution, damage of aluminum alloy mechanical properties, unfavorable industrial production, etc., and achieves low cost, simple equipment and high preparation process simple effect

Inactive Publication Date: 2007-08-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the NaOH aqueous solution takes a long time to process
Long-term treatment will damage the mechanical properties of aluminum alloy and is not conducive to industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The aluminum alloy foil was polished with metallographic sandpaper, then ultrasonically cleaned in water and acetone for 10 minutes, and rinsed with pure water. Put the treated aluminum alloy foil into a chemical corrosion solution containing 10wt% nitric acid and 1.0g / L copper nitrate trihydrate for treatment. The treatment temperature was 90° C., and the treatment time was 6 minutes. After the aluminum sheet was taken out, it was repeatedly rinsed with pure water and ethanol, and then placed in an ethanol solution with a concentration of decyltriethoxysilane of 1.0 mmol / L and a water concentration of 3.0 mmol / L for 24 hours. Then take it out, rinse it with a small amount of ethanol, and bake it at 150°C for 10 minutes. The surface of the treated aluminum foil is whitish, showing a uniform, smooth and soft matte effect. The scanning electron microscope photos show that there are a large number of crater-like pits on the surface of the aluminum foil, the size of which...

Embodiment 2

[0016] The aluminum sheet with a purity of 99.9% was polished with metallographic sandpaper, then ultrasonically cleaned with water and acetone for 10 minutes, and rinsed with pure water. Put the treated aluminum foil into a chemical corrosion solution containing 15wt% nitric acid and 3.0g / L copper nitrate trihydrate for treatment. The treatment temperature was 95° C., and the treatment time was 1 minute. After taking out the aluminum sheet, rinse it repeatedly with pure water and ethanol, and then put it into an ethanol solution with a concentration of perfluorotetrahydrododecyltriethoxysilane of 2.0mmol / L and a water concentration of 6.0mmol / L for 24 Hour. Then take it out, rinse it with a small amount of ethanol, and bake it at 150°C for 10 minutes. The surface of the treated aluminum foil is whitish, showing a uniform, smooth and soft matte effect. When a water droplet falls on the surface of the aluminum foil from a height, it can bounce off and roll freely on the surf...

Embodiment 3

[0018] The aluminum alloy sheet was polished with metallographic sandpaper, then ultrasonically cleaned with water and acetone for 10 minutes, and rinsed with pure water. Put the treated aluminum foil into a chemical corrosion solution containing 2wt% nitric acid and 1.0g / L copper nitrate trihydrate for treatment. The treatment temperature is 95-100° C., and the treatment time is 15 minutes. After taking out the aluminum sheet, rinse it repeatedly with pure water and ethanol, and then put it into the ethanol solution with the concentration of perfluorotetrahydrooctyltriethoxysilane at 1.0mmol / L and the concentration of water at 3.0mmol / L for 12 hours . Then take it out, rinse it with a small amount of ethanol, and bake it at 150°C for 10 minutes. The surface of the treated aluminum foil is whitish, showing a uniform, smooth and soft matte effect. Water droplets are easy to roll on the surface of the aluminum foil, and the contact angle between the treated aluminum foil and ...

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PUM

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Abstract

The invention involves an aluminum or aluminum alloy super-hydrophobic surface preparation method. The method is: polishing the surface of aluminum or aluminum alloy using metallographic sandpaper or polishing paste, pure water washing, acetone ultrasonic cleaning, pure water washing and other clean treatment, handing it with chemical etching solution containing nitric acid and metal salts (copper or nickel salt) 30s-20min under 90 ~ 100 degree C, then coating low surface energy material on its surface to get super-hydrophobic property. The aluminum or aluminum alloy surface treated by the invention has excellent hydrophobicity, the contact angle of water and surface can be as high as 150-165 degree, droplets are easy to roll on the surface. The method of the invention need not complex equipment, cost is low, technology is simple and repeatability is good.

Description

technical field [0001] The invention relates to a method for treating the surface of a metal base material, in particular to a method for manufacturing a super-hydrophobic surface of aluminum and aluminum alloy. Background technique [0002] Aluminum and aluminum alloys are widely used in transportation, energy, food, electronics, home appliances, aviation and other fields. In some fields, there are strict requirements on the wettability of aluminum and alloy surfaces. For example, aluminum foil used in air conditioner heat exchangers requires the contact angle between water and its surface to be as low or as high as possible, which can reduce the formation of water bridges between aluminum sheets and improve heat transfer efficiency. The super-hydrophobic surface with high contact angle and extremely low rolling angle can not only solve the problem of water bridge on the surface of aluminum foil, but also may solve the problem of air-conditioning frosting / defrosting, the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/24B05D3/12B05D3/10C09D5/16C23F1/20C23G1/24C23G5/00
Inventor 符小艺牟涛
Owner SOUTH CHINA UNIV OF TECH
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