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Double-layer super-hydrophobic material and preparation method thereof

A super-hydrophobic, double-layer technology, applied in the coating process of metal materials, coatings, etc., can solve the problems of reducing surface energy, corrosion, growth, etc., to achieve improved roughness, obvious corrosion resistance, and slow corrosion rate Effect

Active Publication Date: 2016-11-16
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common ceramic materials, glass and other amorphous materials are difficult to be ideal materials for constructing superhydrophobic surfaces due to their lack of crystalline properties.
[0004] Through the study of the hydrophobic effect of the crystal growth on the alloy surface on the substrate, we found that the micro-nano sheet structure provides good support for the surface to achieve the effect of reducing the surface energy and achieve the super-hydrophobic effect. However, the growth of this crystal on the alloy surface cannot achieve Completely dense; so during use, the droplets will still come into contact with the substrate and corrosion will gradually occur

Method used

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  • Double-layer super-hydrophobic material and preparation method thereof
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  • Double-layer super-hydrophobic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The material of the present invention is a super-hydrophobic film with two layers of micro-nano multi-level structure coated on an alloy substrate. The composition of the super-hydrophobic film is a long-chain fatty acid salt; the first super-hydrophobic layer above the substrate is a micro-nano sheet layer The network crystal structure built, the second layer of super-hydrophobic crystal micro-nano non-uniform distribution sheet structure.

[0034] The preparation method of this material is:

[0035] (1) AZ31 magnesium alloy was selected to be polished with sandpaper and soaked in absolute ethanol to ultrasonically clean the oxide film and oil stain on the surface of the alloy, cleaned with deionized water, and dried to obtain material A;

[0036] (2) according to 0.5-10mL / cm 2 Soak material A into a mixture of equal volumes of 0.01mol / L stearic acid ethanol solution and 0.01mol / L nickel sulfate aqueous solution, heat at 140°C for 7 hours; take out and dry after cooli...

Embodiment 2

[0040] The material preparation method of this example is basically the same as that of Example 1, except that the heating temperature of the second hydrothermal heating is 90°C.

[0041] The material obtained by this method has a special double-layer micro-nano structure, the bottom layer is a network structure built by micro-nano sheets, and the upper layer is a complementary micro-nano three-dimensional sheet structure.

[0042] The material synthesized by the two-step hydrothermal method of the method has excellent hydrophobic properties, the surface contact angle reaches 152°, does not adhere to various complex liquids, and has good self-cleaning properties and antifouling properties. The material has good corrosion resistance, and after soaking in 3.5wt.% NaCl solution for 24 hours, the impedance modulus can still reach 800Ωcm 2 .

Embodiment 3

[0044] The material preparation method of this example is basically the same as that of Example 1, except that the heating temperature of the second hydrothermal heating is 120°C.

[0045] The material obtained by this method has a special double-layer micro-nano structure, the bottom layer is a network structure built by micro-nano sheets, and the upper layer is a sheet-like structure with a relatively uniform micro-nano distribution complementary to it.

[0046]The surface contact angle of the double-layer superhydrophobic material reaches 151°, which also achieves the double-layer superhydrophobic effect; it has self-cleaning, anti-fouling and corrosion resistance properties, and after soaking in 3.5wt.% NaCl solution for 24 hours, the impedance modulus can still reach 700Ωcm 2 .

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Abstract

The invention provides a double-layer super-hydrophobic material and a preparation method thereof. An alloy substrate material is ground through abrasive paper and ultrasonically cleaned by being soaked in absolute ethyl alcohol, so that oxide films and oil stains on the surface of the alloy substrate material are removed, and A is obtained; the A is soaked in a mixed solution, formed by equivalent-volume mixing of a 0.01 mol / L stearic acid ethanol solution and a 0.01 mol / L nickel sulfate aqueous solution, according to the proportion of 0.5-10 mL / cm<2>, and then heated for 7 h through water at the temperature of 140 DEG C; the A is cooled, taken out and dried to obtain B; the B is soaked in a mixed solution, formed by equivalent-volume mixing of a 0.01-0.2 mol / L stearic acid ethanol solution and a 0.01-0.2 mol / L cobalt sulfate aqueous solution, according to the proportion of 0.5-10 mL / cm<2>, and then heated for 5-8 h through water at the temperature of 90-130 DEG C; and the B is cooled, taken out and dried to obtain the double-layer super-hydrophobic material. According to the double-layer super-hydrophobic material and the preparation method thereof, the purpose that alloy is provided with super-hydrophobic films with the corrosion resistance and the antifouling property being stable for a long time can be achieved.

Description

technical field [0001] The invention relates to a metal material surface treatment method, in particular to a double-layer super-hydrophobic material with anti-fouling and corrosion-resistant effects and a preparation method thereof. Background technique [0002] Superhydrophobic materials can reduce the contact area between the substrate and corrosive media by virtue of the special wettability of the surface that is not easily wetted by liquid, and achieve effective antifouling and corrosion resistance. It has received wide attention from all walks of life. A superhydrophobic material is defined as a material on which a droplet has a static contact angle greater than 150° on its surface and from which the droplet slides off the surface easily. Studies have shown that the two key factors for the preparation of superhydrophobic materials are the surface micro-rough structure and low surface energy. Crystal structure materials have special properties that non-crystals do not...

Claims

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Application Information

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IPC IPC(8): C23C26/00
CPCC23C26/00
Inventor 王君李佳欢刘琦刘婧媛李占双李茹民刘连河
Owner HARBIN ENG UNIV
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