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Anodic oxidation method for preparing aluminum-based super-hydrophobic film

A super-hydrophobic, water-drop technology, applied in the direction of anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problems of high cost and difficult industrialization, achieve good reproducibility, simple operation process, and good industrial application prospects Effect

Inactive Publication Date: 2012-01-04
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these existing methods either use expensive materials such as fluorinated siloxane with extremely low surface energy, or require special processing equipment such as plasma processing equipment or complicated processes, so the cost is high and it is difficult to industrialize

Method used

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  • Anodic oxidation method for preparing aluminum-based super-hydrophobic film
  • Anodic oxidation method for preparing aluminum-based super-hydrophobic film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First, the aluminum alloy plate was mechanically polished and polished to remove surface defects and oxide films, and was cleaned with ethanol and deionized water for 15 minutes, respectively. The prepared electrolyte was 1.803 mol / L sulfuric acid, 0.068 mol / L potassium dichromate, 0.079 mol / L oxalic acid, 2.57 mol / L sodium chloride and 1.37 mol / L glycerin. Then use the aluminum plate as the anode and the graphite as the cathode to carry out the reaction. The control current density is 1.2 A / dm 2 , and the reaction time was 30 min. Wash the reacted aluminum sheet with distilled water and dry it or dry it naturally; soak it in stearic acid ethanol solution with a mass fraction of 1% for 30 minutes, and dry it for 24 hours at a relative humidity of 60-75% and at room temperature , the aluminum alloy porous superhydrophobic surface can be prepared. The wettability of the coating surface was tested with an OCA20 contact angle tester, and the results showed that the conta...

Embodiment 2

[0019] First, the aluminum alloy plate was mechanically polished and polished to remove surface defects and oxide films, and was cleaned with ethanol and deionized water for 15 minutes, respectively. Prepare the electrolyte as 1.37 mol / L sulfuric acid, 0.054 mol / L potassium dichromate, 0.079 mol / L oxalic acid, 2.6 mol / L sodium chloride and 1.37 mol / L glycerin. Then use the aluminum plate as the anode and the graphite as the cathode to carry out the reaction. The control current density is 1.3 A / dm 2 , and the reaction time was 35 min. Wash the reacted aluminum sheet with distilled water and dry it or dry it naturally; soak it in stearic acid ethanol solution with a mass fraction of 1% for 30 minutes, and dry it for 25 hours at a relative humidity of 60~75% and at room temperature , the aluminum alloy porous superhydrophobic surface can be prepared. The wettability of the coating surface was tested with an OCA20 contact angle tester, and the results showed that the contact ...

Embodiment 3

[0021] First, the aluminum alloy plate was mechanically polished and polished to remove surface defects and oxide films, and was cleaned with ethanol and deionized water for 15 minutes, respectively. The prepared electrolyte was 1.803 mol / L sulfuric acid, 0.06 mol / L potassium dichromate, 0.079 mol / L oxalic acid, 2.57 mol / L sodium chloride and 1.37 mol / L glycerin. Then use the aluminum plate as the anode and the graphite as the cathode to carry out the reaction. The control current density is 1.4A / dm 2 , and the reaction time was 35 min. Wash the reacted aluminum plate with distilled water and dry it or dry it naturally; soak it in stearic acid ethanol solution with a mass fraction of 1% for 30 minutes, and dry it for 26 hours at a relative humidity of 60~75% and at room temperature , the aluminum alloy porous superhydrophobic surface can be prepared. The wettability of the coating surface was tested with an OCA20 contact angle tester, and the results showed that the contact...

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Abstract

The invention belongs to the field of preparation technology of super-hydrophobic surface and provides an anodic oxidation method for preparing an aluminum-based porous super-hydrophobic surface. The method comprises the following steps: performing mechanical polishing on an aluminum alloy board, removing surface defects and oxidation films, washing with ethanol and deionized water, and drying; preparing electrolyte consisting of 1.803 mol / L of sulfuric acid, 0.068 mol / L of potassium dichromate, 0.079 mol / L of oxalic acid, 2.57 mol / L of sodium chloride and 1.37 mol / L of glycerin; then electrifying by taking the aluminum board as an anode and graphite as a cathode for reaction, wherein the current density is controlled to 1.2 A / dm<2> and the reaction time is 30-40 min; washing the reacted aluminum board with distilled water, and drying or naturally airing; placing the aluminum board in 1 wt% stearic acid ethanol solution to soak for 20-30 min and then taking out the aluminum board; washing the aluminum board with a proper amount of alcohol; taking out the aluminum board and cleaning with clean water; and drying at the room temperature in the atmospheric environment for 24-28 hours under the relative humidity of 60-75% to prepare the porous aluminum alloy super-hydrophobic surface.

Description

technical field [0001] The invention relates to a method for preparing an aluminum-based super-hydrophobic surface in an atmospheric environment at room temperature. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and is widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. It has excellent electrical conductivity, thermal conductivity, processing plasticity, corrosion resistance and high strength. However, the metal surface obtained by the commonly used aluminum alloy surface treatment methods is not self-cleaning, easy to be polluted, and lacks long-term protection performance in corrosive solution environments such as acids, alkalis, and salts. Therefore, it has always been an important topic in the field of metal material protection to study new aluminum alloy protection methods or approaches that are stronger, more stable and have better long-t...

Claims

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Application Information

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IPC IPC(8): C25D11/08C25D11/18
Inventor 吴若梅梁叔全喻亚
Owner HUNAN UNIV OF TECH
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