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Preparation method for metallic aluminum super-hydrophobic surface

A super-hydrophobic surface, metal aluminum technology, applied in the direction of surface coating liquid device, special surface, surface reaction electrolytic coating, etc., can solve the problems of lattice limitation, difficult quality control, cumbersome and other problems, and achieve the reduction of current density Small size, low equipment requirements, and wide application range

Inactive Publication Date: 2009-09-16
JIMEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is cumbersome, requires a large oxidation current, takes a long time to react with the inorganic salt solution, and requires heating
[0008] In summary, the chemical etching method is simple and fast, but the disadvantage is that it is limited by the lattice and the quality is difficult to control
Electrochemical corrosion is easy to form a uniform nanostructure, but it needs to use expensive high-power power supply equipment and long processing time, which is not conducive to mass production

Method used

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  • Preparation method for metallic aluminum super-hydrophobic surface
  • Preparation method for metallic aluminum super-hydrophobic surface
  • Preparation method for metallic aluminum super-hydrophobic surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) The aluminum sheet was ultrasonically cleaned with acetone, ethanol, and deionized water for 5 minutes in sequence, and dried naturally for later use.

[0029] (2) Soak the washed aluminum sheet in 1M NaOH solution until a large number of bubbles are formed on the surface for 30 seconds, and then soak it in 5M HCl solution for 5 minutes.

[0030] (3) With the platinum sheet as the cathode and the aluminum foil as the anode, the areas of the cathode and the anode are equal, placed in parallel and facing each other, at room temperature and electrochemical corrosion solution (5%wt H 3 PO 4 Solution: glycerol=1:1V / V) under magnetic stirring, constant current density 1mA / cm 2 Oxidation for 10min. At this time, the surface has superhydrophilic properties, and the contact angle is almost zero.

[0031] (4) Dip the aluminum sheet in a 1% (fluorosilane: ethanol = 1:99 V / V) fluorosilane ethanol solution at 60°C for 1 hour, take it out and dry it naturally to obtain a super...

Embodiment 2

[0034] (1) The aluminum sheet was ultrasonically cleaned with acetone, ethanol, and deionized water for 5 minutes in sequence, and dried naturally for later use.

[0035] (2) Soak the washed aluminum sheet in 1M NaOH solution for 30s until a large number of bubbles are formed on the surface, and then soak it in 4M HCl solution for 10min.

[0036](3) With two equal-area platinum sheets as cathodes and aluminum foils as anodes, they are placed in parallel and facing each other with a distance of 10 mm. 3 PO 4 Solution: glycerol=2:3V / V) under magnetic stirring, constant current density 3mA / cm 2 Oxidation for 15min. At this time, the surface has superhydrophilic properties, and the contact angle is almost zero.

[0037] (4) Dip the aluminum sheet in 1% (fluorosilane: ethanol = 1:99 V / V) fluorosilane ethanol solution for 12 hours, and then dry it in an oven at 120° C. for 10 minutes to obtain a superhydrophobic surface. The contact angle of water droplets on the aluminum surfac...

Embodiment 3

[0039] (1) The aluminum sheet was ultrasonically cleaned with acetone, ethanol, and deionized water for 5 minutes in sequence, and dried naturally for later use.

[0040] (2) Soak the washed aluminum sheet in 1M NaOH solution for 60s until a large number of bubbles are formed on the surface, and then soak it in 3M HCl solution for 20min.

[0041] (3) With two equal-area platinum sheets as cathodes and aluminum foils as anodes, they are placed in parallel and facing each other with a distance of 10 mm. 3 PO 4 Solution: glycerol=2:3V / V) under magnetic stirring, constant current density 3mA / cm 2 Oxidation for 20min. At this time, the surface has superhydrophilic properties, and the contact angle is almost zero.

[0042] (4) Dip the aluminum sheet in 1% (fluorosilane: ethanol = 1:99 V / V) fluorosilane ethanol solution for 12 hours, and then dry it in an oven at 120° C. for 10 minutes to obtain a superhydrophobic surface. The contact angle of water droplets on the aluminum surfa...

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Abstract

A preparation method for a metallic aluminum super-hydrophobic surface is disclosed, relating to the treatment of metal surface. A preparation method for the metallic aluminum super-hydrophobic surface is provided. Cleaning of an aluminum sheet comprises cleaning and then air-drying the aluminum sheet to obtain the cleaned and air-dried aluminum sheet for future use; chemical corrosion comprises removing an oxide layer on the surface of the cleaned and air-dried aluminum sheet and then immersing the aluminum sheet in a HCl solution for corrosion or in a NaOH solution; electrochemical corrosion comprises regarding the chemically-corroded aluminum sheet as an anode and regarding a platinum sheet or a titanium net as an cathode, arranging in parallel the anode and the cathode in face of each other, and implementing one-step anodic oxidation in a constant-current mode; fluorosilane modification comprises immersing the electrochemically-corroded aluminum sheet in a fluorosilane alcohol solution for the modification and the drying to result in the metallic aluminum super-hydrophobic surface. Compared with the use of the chemical method or the electrochemical method only, the two-step method integrates the advantages of the chemical method and the electrochemical method, the required processing time is shorter, the apparatuses are so simpler as to be beneficial for large-scale production, and the invention can be used for the preparation of the super-hydrophobic surface of other metals.

Description

technical field [0001] The invention relates to metal surface treatment, in particular to a method for preparing a super-hydrophobic surface of metal aluminum or aluminum alloy. Background technique [0002] In recent years, superhydrophobic surfaces on metal substrates have attracted much attention due to their wide application prospects. The super-hydrophobic surface is used on metal materials, which can have the effect of anti-fouling, anti-rust and reducing the coefficient of friction (using water as lubricant); The frictional resistance between them increases the driving speed and reduces the noise; the superhydrophobic surface is used on the needle tip of the micro-syringe, which can completely eliminate the adhesion of expensive drugs on the needle tip and the resulting loss and pollution. [0003] A superhydrophobic surface generally refers to a surface whose contact angle with a water droplet is greater than 150°. It is generally believed that the composite rough ...

Claims

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Application Information

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IPC IPC(8): C25D11/24B05D5/08
Inventor 张芹朱元荣
Owner JIMEI UNIV
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