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Preparation of super-hydrophobic surface for metal anti-corrosive and self-cleaning effects

A super-hydrophobic surface, metal anti-corrosion technology, applied in the direction of electrolytic organic material coating, etc., can solve the problems of difficult process control, long preparation time, complicated operation, etc., and achieve the effect of low cost, simple operation, and high environmental stability

Inactive Publication Date: 2009-05-27
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, there have been literature and patent reports using methods for preparing superhydrophobic surfaces to reduce the contact between metal surfaces and water, so as to achieve metal anticorrosion and self-cleaning. However, these reported methods generally have complex operations, long preparation time, and process control. Disadvantages such as difficulty and instability

Method used

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  • Preparation of super-hydrophobic surface for metal anti-corrosive and self-cleaning effects
  • Preparation of super-hydrophobic surface for metal anti-corrosive and self-cleaning effects
  • Preparation of super-hydrophobic surface for metal anti-corrosive and self-cleaning effects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Use an ultrasonic cleaner to clean the metal copper sheet sample for the test. The cleaning steps are: put the copper substrate in acetone, deionized water, and ethanol in sequence and clean it with ultrasonic waves for 5 minutes each to remove the grease and other pollution on the surface substance;

[0028] 2. Use the treated copper sheet as the anode and cathode of the electrochemical reaction respectively, and put the 3 (CH 2 ) 10 COOH) in the ethanol solution, apply a DC voltage of 5V between the anode and the cathode;

[0029] After 3.1 hours, the cathode copper sheet was taken out, rinsed with ethanol and deionized water, and dried in the atmosphere to obtain a superhydrophobic surface layer attached to the surface of the cathode copper sheet.

[0030] 4. After testing with the contact angle detector, the results are: the contact angle is 154.8°, and the rolling angle is 2.3°. Such as image 3 As shown, the water droplet is approximately spherical on the p...

Embodiment 2

[0032] 1. Use an ultrasonic cleaner to clean the metal zinc and iron sheet samples used in the test. The cleaning steps are: put the metal zinc and iron substrates in acetone, deionized water, and ethanol in turn and clean them with ultrasonic waves for 5 minutes each to remove the surface. grease and other pollutants;

[0033]2. Use the treated metal zinc and iron substrates as the anode and cathode of the electrochemical reaction respectively and put in 0.05mol / L fatty acid (CH 3 (CH 2 ) 10 COOH) in the ethanol solution, apply a DC voltage of 2V between the anode and the cathode;

[0034] 3. After 2 hours, the cathode iron sheet is taken out, rinsed with ethanol and deionized water, and dried in the atmosphere to obtain a super-hydrophobic surface layer attached to the cathode iron sheet surface.

[0035] 4. After testing with the contact angle detector, the results are: the contact angle is 153.8°, and the rolling angle is 2.5°.

Embodiment 3

[0037] 1. Use an ultrasonic cleaner to clean the metal copper and aluminum samples for the test. The cleaning steps are as follows: put the copper substrate in acetone, deionized water, and ethanol in sequence and clean it with ultrasonic waves for 5 minutes each to remove the grease and oil on the surface. other pollutants;

[0038] a) Use the treated metal copper and aluminum substrates as the anode and cathode of the electrochemical reaction respectively and put 0.05mol / L fatty acid (CH 3 (CH 2 ) 12 COOH) in the ethanol solution, apply a DC voltage of 4V between the anode and the cathode;

[0039] 2. After 2 hours, take out the cathode aluminum sheet, rinse it with ethanol and deionized water, and dry in the atmosphere to obtain the super-hydrophobic surface layer attached to the surface of the cathode aluminum sheet.

[0040] 3. After testing with the contact angle detector, the results are: the contact angle is 157.2°, and the rolling angle is 2.1°.

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Abstract

The invention relates to a method for preparing a super-hydrophobic surface with metal corrosion protection and self-cleaning functions, which comprises the following steps: 1) washing a metal or an alloy substrate clean by using acetone, deionized water and ethanol sequentially; 2) using the cleaned metal or the alloy substrate as an anode and a cathode respectively and putting the anode and the cathode into a fatty acid CH3(CH2)n-2COOH electrolyte solution with the concentration of between 0.001 and 0.5 mol per liter, wherein n is equal to between 10 and 14; and applying voltage of between 0.5 and 25 volts between the cathode and anode to perform an electrochemical reaction for 0.5 to 6 hours so as to deposit a layer of a fatty acid salt super-hydrophobic surface with the metal corrosion protection and self-cleaning functions on the surface of the metal or the alloy substrate serving as the cathode. The method has simple operation and low equipment requirement, is not limited by the shape of a substrate, is easy to achieve industrialization, and has comparatively wide practical value.

Description

technical field [0001] The invention relates to a method for preparing a superhydrophobic material, in particular to a method for preparing a superhydrophobic surface for metal anticorrosion and self-cleaning functions. Background technique [0002] Metals and alloys are widely used in various departments of shipbuilding, construction, national defense and national production due to their excellent electrical conductivity, thermal conductivity, certain strength and good processability. However, ordinary metals are easily corroded in humid or corrosive environments, which affects the service life of the material, causes it to not function normally, and brings many unsafe factors to users. Worldwide, the consumption caused by metal corrosion accounts for 2 to 3% of the entire industrial product production, and the direct economic loss caused by it reaches 700 billion U.S. dollars every year. If the indirect losses such as maintenance costs are included, this figure will be gre...

Claims

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Application Information

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IPC IPC(8): C25D9/02
Inventor 郗金明孟海凤江雷
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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