Preparation method of aluminum based fluoride-free superhydrophobic membrane

A super-hydrophobic, aluminum-based technology, applied to the surface coating liquid device, special surface, pre-treated surface, etc., can solve the problems of reducing surface free energy, threatening the ecological environment and human safety, etc., to achieve good water repellency, The effect of reducing the solid-liquid contact area and facilitating large-scale production

Inactive Publication Date: 2019-06-28
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current technologies for preparing superhydrophobic surfaces generally require special equipment and experimental conditions to give the surface a certain roughness. In addition, in order to reduce the free energy of the surface, fluorine-containing chemical reagents are frequently used for fluorination treatment, which seriously threatens the ecological environment. Environmental and Human Safety

Method used

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  • Preparation method of aluminum based fluoride-free superhydrophobic membrane
  • Preparation method of aluminum based fluoride-free superhydrophobic membrane
  • Preparation method of aluminum based fluoride-free superhydrophobic membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The 5083 aluminum alloy was polished smooth with 200-mesh, 400-mesh, 800-mesh, 1200-mesh and 2000-mesh sandpaper in sequence. After grinding, it was placed in excess absolute ethanol and deionized water for 10 minutes, and then the sample was taken out and placed in a Etched in 15g / L sodium hydroxide aqueous solution at room temperature for 30min, then dried and soaked in ethanol solution containing 2% hexadecyltrimethoxysilane for 2 hours, and then placed in a 120°C Heating and drying in an oven for 10 minutes can form a non-fluorinated superhydrophobic film on the surface of the sample.

[0029] Then the static contact angle of the blank 5083 aluminum alloy substrate and the above-mentioned super-hydrophobic 5083 surface is tested by a contact angle measuring instrument, wherein, the 5083 aluminum alloy without super-hydrophobic treatment is used as a blank, by figure 1 and figure 2 The static contact angle shown is seen by figure 1 It can be seen that the static c...

Embodiment 2

[0033] The 6061 aluminum alloy was polished smooth with 200-mesh, 400-mesh, 800-mesh, 1200-mesh and 2000-mesh sandpaper in sequence. After grinding, it was placed in excess absolute ethanol and deionized water for 5 minutes, respectively, and then the sample was taken out and placed in a Etch in 10g / L sodium hydroxide aqueous solution at room temperature for 60min, then dry it and place it in an ethanol solution containing 3% octadecyltriethoxysilane for 1 hour, then place it at 100°C Heating and drying in a special oven for 30 minutes can form a non-fluorinated superhydrophobic film on the surface of the sample. The static contact angle of the resulting superhydrophobic film is 154.2°, as Figure 5 shown.

Embodiment 3

[0035] The 2024 aluminum alloy was polished smooth with 200-mesh, 400-mesh, 800-mesh, 1200-mesh and 2000-mesh sandpaper in sequence. After grinding, it was placed in excess absolute ethanol and deionized water for 5 minutes, and then the sample was taken out and placed in a Etched in 20g / L sodium hydroxide aqueous solution at room temperature for 20min, then dried and soaked in an ethanol solution containing 1% octadecyltrimethoxysilane for 12 hours, and then placed in a 150°C Heating and drying in an oven for 10 minutes can form a non-fluorinated superhydrophobic film on the surface of the sample. The resulting superhydrophobic film has a static contact angle of 155.5°, as Figure 6 shown.

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Abstract

The invention belongs to the technical field of metal surface processing, in particular to a preparation method of an aluminum based fluoride-free superhydrophobic membrane. The method comprises the steps that a processed aluminum material is placed in a sodium hydroxide solution with the concentration of 10-25 g/L to conduct surface etching to form a multi-stage texture structure, the aluminum material is placed in an ethanol solution with the silane concentration of 1-5% to perform lower-surface energy molecule self assembling, and the superhydrophobic membrane is obtained on the surface ofthe aluminum material after drying. The method has the advantages that the operation is simple and convenient, the method is environmental-friendly, the scale preparation of the superhydrophobic membrane is convenient, and excellent surface self-cleaning and corrosion-resistance characteristics are achieved.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a preparation method of an aluminum-based fluorine-free super-hydrophobic film. Background technique [0002] Based on the excellent characteristics of light weight and high strength of aluminum, it is widely used in aerospace, ships, automobile manufacturing and other fields. However, since the natural oxide film formed on the surface of aluminum is relatively loose, it cannot provide good corrosion protection properties for the substrate. Therefore, in a corrosive environment, the corrosive medium and corrosive ions are easy to penetrate and diffuse into the substrate, causing corrosion and material corrosion. Performance failure, and then cause serious economic losses and safety accidents. [0003] The preparation of biomimetic superhydrophobic surfaces and their basic research in the field of corrosion protection have attracted extensive attention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/18B05D3/00B05D5/08B05D7/14B05D7/24C23F1/36
Inventor 张斌斌李红玲徐玮辰朱庆军侯保荣
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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