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A preparation method of magnesium alloy superhydrophobic coating based on zeolite imidazolate framework

A technology of zeolite imidazolate and super-hydrophobic coating, which is applied in metal material coating technology, coating, surface reaction electrolytic coating, etc., can solve the problems of unfavorable promotion and application of ZIF super-hydrophobic coating, various reagents, and harmful environment , to achieve the effect of easy promotion and use, not easy to fall off, and strong binding force

Active Publication Date: 2022-02-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above that the current preparation methods of ZIF superhydrophobic coatings have the disadvantages of cumbersome steps and various reagents. Some methods require the use of fluorine-containing reagents, which are harmful to the environment and are not conducive to the popularization and application of ZIF superhydrophobic coatings.

Method used

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  • A preparation method of magnesium alloy superhydrophobic coating based on zeolite imidazolate framework
  • A preparation method of magnesium alloy superhydrophobic coating based on zeolite imidazolate framework
  • A preparation method of magnesium alloy superhydrophobic coating based on zeolite imidazolate framework

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Use 240#, 400#, 600#, 1000#, 1500# metallographic water abrasive paper to polish the AZ31B magnesium alloy sample successively to remove surface oxides, and then use acetone and absolute ethanol to ultrasonically clean the sample for 10 minutes, Then rinse with deionized water for 30s, and dry with cold air;

[0023] (2) the magnesium alloy sample that step (1) is processed is put into the electrolytic solution that the sodium hydroxide of 10g / L and the sodium hydroxide of 2g / L form, at 17A / dm 2 The current density, the pulse frequency of 100Hz and the duty cycle of 40% (+) and 40% (-) were treated by micro-arc oxidation for 40 minutes, and then cleaned with deionized water for 3 minutes and dried with cold air to obtain a micro-arc with a micron structure. oxide ceramic surfaces such as figure 1 shown;

[0024] (3) Slowly pour 25 mL of zinc nitrate hexahydrate solution with a concentration of 0.1 mol / L into 25 mL of 2-methylimidazole solution with a concentration...

Embodiment 2

[0027] (1) Use 240#, 400#, 600#, 1000#, 1500# metallographic water abrasive paper to polish the AZ31B magnesium alloy sample successively to remove surface oxides, and then use acetone and absolute ethanol to ultrasonically clean the sample for 10 minutes, Then rinse with deionized water for 30s, and dry with cold air;

[0028](2) Place the magnesium alloy sample processed in step (1) in an acetic acid solution with a concentration of 0.2mol / L, etch it for 10 minutes at room temperature, rinse it with deionized water for 1 minute, and dry it with cold air to obtain a micron structure. surface;

[0029] (3) Slowly pour 25 mL of zinc nitrate hexahydrate solution with a concentration of 0.1 mol / L into 25 mL of 2-methylimidazole solution with a concentration of 0.4 mol / L, and magnetically stir at a speed of 500 r / min for 30 min to obtain nitric acid hexahydrate A mixed solution of zinc and 2-methylimidazole, then the magnesium alloy with a micron-structured surface obtained in st...

Embodiment 3

[0032] (1) Use 240#, 400#, 600#, 1000#, 1500# metallographic water abrasive paper to polish the AZ31B magnesium alloy sample successively to remove surface oxides, and then use acetone and absolute ethanol to ultrasonically clean the sample for 10 minutes, Then rinse with deionized water for 30s, and dry with cold air;

[0033] (2) Place the magnesium alloy sample processed in step (1) in an acetic acid solution with a concentration of 0.4mol / L, etch it for 5 minutes at room temperature, rinse it with deionized water for 1 minute, and dry it with cold air to obtain a micron structure. surface;

[0034] (3) Slowly pour 25 mL of zinc nitrate hexahydrate solution with a concentration of 0.05 mol / L into 25 mL of 2-methylimidazole solution with a concentration of 0.1 mol / L, and magnetically stir at a speed of 500 r / min for 30 min to obtain nitric acid hexahydrate A mixed solution of zinc and 2-methylimidazole, then the magnesium alloy with a micron-structured surface obtained in s...

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Abstract

The invention discloses a preparation method of a magnesium alloy superhydrophobic coating based on a zeolite imidazolate framework, and belongs to the field of metal surface modification. In the present invention, the magnesium alloy is first subjected to micro-arc oxidation treatment to form a certain rough structure, and then the zeolite imidazolate framework structure (ZIF-L) is grown on the surface of the magnesium alloy by an in-situ growth method, and finally n-octyltriethyl Oxysilane is used to treat the surface with low energy, so that the surface of magnesium alloy can obtain superhydrophobic function. When distilled water is dropped on the surface, the contact angle is greater than 150°, and the rolling angle is less than 10°, achieving the superhydrophobic effect. The reaction process of the method is not limited by the shape of the substrate, the obtained coating has strong binding force, the reagents used are environmentally friendly, and are easy to popularize and apply.

Description

technical field [0001] The invention belongs to the technical field of surface modification of metal materials, and specifically relates to a preparation method for performing micro-arc oxidation treatment on the surface of a magnesium alloy, growth of a zeolite imidazolate skeleton structure and low-energy treatment on the surface, so that the surface of the magnesium alloy can obtain a superhydrophobic function. Background technique [0002] There are some special biological surface phenomena in nature, such as the lotus leaf coming out of the mud without being stained, and the water strider walking freely on the water surface. Superhydrophobic surfaces have broad application prospects, and there are more and more researches on self-cleaning, anti-icing, corrosion resistance, oil-water separation, anti-scaling and drag reduction. In recent years, researchers at home and abroad have published many preparation technologies for superhydrophobic coatings, and have constructed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30C23C22/73C23C22/68
CPCC25D11/30C25D11/024C25D11/026C23C22/73C23C22/68C23C2222/20
Inventor 于思荣王珺王丽媛尹晓丽朱光李京李权
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)