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Method for preparing super-hydrophobic zinc-aluminum hydrotalcite coating on surface of aluminum alloy

A technology of aluminum alloy surface and hydrotalcite, applied in metal material coating process, coating, etc., can solve the problems of unfavorable popularization and application, high cost, complicated process flow, etc., and achieve easy popularization and application, good protection and wide source Effect

Active Publication Date: 2021-02-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of preparing zinc-aluminum hydrotalcite coatings disclosed in the above patents by water bath method and hydrothermal reaction method needs to prepare aluminum oxide layer on the surface of aluminum and aluminum alloy through anodic oxidation, micro-arc oxidation and other methods in advance. The process is complicated and the cost is high. , Not conducive to the promotion and application

Method used

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  • Method for preparing super-hydrophobic zinc-aluminum hydrotalcite coating on surface of aluminum alloy
  • Method for preparing super-hydrophobic zinc-aluminum hydrotalcite coating on surface of aluminum alloy
  • Method for preparing super-hydrophobic zinc-aluminum hydrotalcite coating on surface of aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Grind the 6061 aluminum alloy sample on 240#, 400#, 600#, 1000#, 1500# SiC sandpaper in order to remove the oxide film on the surface of the sample, and then put the sample in absolute ethanol and Ultrasonic cleaning in deionized water for 10 minutes to remove impurities and oil stains on the surface of the sample, take it out and dry it with cold wind for later use;

[0023] (2) Preparation containing 0.015mol / L ZnSO 4 ·7H 2 A mixed solution of O and 0.1mol / L urea, fully stirred to make the solution evenly mixed; place the aluminum alloy sample treated in step (1) and the above mixed solution in a hydrothermal reaction kettle, and place it in a drying oven at 120°C React for 8 hours; after the reaction, take out the sample, wash it repeatedly with deionized water, dry it with cold air, and get a zinc-aluminum hydrotalcite coating on the surface of the aluminum alloy;

[0024] (3) Dissolve 0.01mol stearic acid in 100mL absolute ethanol, fully stir to make the solu...

Embodiment 2

[0026] (1) Grind the 6061 aluminum alloy sample on 240#, 400#, 600#, 1000#, 1500# SiC sandpaper in order to remove the oxide film on the surface of the sample, and then put the sample in absolute ethanol and Ultrasonic cleaning in deionized water for 10 minutes to remove impurities and oil stains on the surface of the sample, take it out and dry it with cold wind for later use;

[0027] (2) Preparation containing 0.015mol / L ZnSO 4 ·7H 2 A mixed solution of O and 0.1mol / L urea, fully stirred to make the solution evenly mixed; place the aluminum alloy sample treated in step (1) and the above mixed solution in a hydrothermal reaction kettle, and place it in a drying oven at 100°C React for 8 hours; after the reaction, take out the sample, wash it repeatedly with deionized water, dry it with cold air, and get a zinc-aluminum hydrotalcite coating on the surface of the aluminum alloy;

[0028] (3) Dissolve 0.01mol stearic acid in 100mL absolute ethanol, fully stir to make the solu...

Embodiment 3

[0030] (1) Grind the 6061 aluminum alloy sample on 240#, 400#, 600#, 1000#, 1500# SiC sandpaper in order to remove the oxide film on the surface of the sample, and then put the sample in absolute ethanol and Ultrasonic cleaning in deionized water for 10 minutes to remove impurities and oil stains on the surface of the sample, take it out and dry it with cold wind for later use;

[0031] (2) Preparation containing 0.005mol / L ZnSO 4 ·7H 2 Mixed solution of O and 0.05mol / L urea, fully stirred to make the solution evenly mixed; place the aluminum alloy sample treated in step (1) and the above mixed solution in a hydrothermal reaction kettle, and place it in a drying oven at 100°C React for 6 hours; after the reaction, take out the sample, wash it repeatedly with deionized water, dry it with cold air, and get a zinc-aluminum hydrotalcite coating on the surface of the aluminum alloy;

[0032](3) Dissolve 0.005mol stearic acid in 100mL absolute ethanol, fully stir to make the solut...

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Abstract

The invention relates to a method for preparing a super-hydrophobic zinc-aluminum hydrotalcite coating on the surface of an aluminum alloy, and belongs to the field of metal material surface modification. The method comprises the steps that firstly, an aluminum alloy sample is subjected to mechanical polishing and ultrasonic cleaning to remove an oxide film and impurities on the surface of the aluminum alloy sample; then, a proper amount of zinc sulfate and urea are dissolved into deionized water, sufficient stirring is performed to make the solution uniformly mixed, the aluminum alloy sampleobtained after surface treatment and the mixed solution are put into a hydrothermal reaction kettle, the aluminum alloy sample is taken out after reacting for a period of time at a certain temperature, cold air drying is performed, and a zinc-aluminum hydrotalcite coating with a flaky or flaky-acicular structure is obtained on the surface of the aluminum alloy; and finally, the sample is soaked inan absolute ethyl alcohol solution of stearic acid to be modified, and the zinc-aluminum hydrotalcite coating with a super-hydrophobic function is obtained, wherein the contact angle of the deionizedwater on the surface of the coating is larger than 150 degrees, and the rolling angle is smaller than 10 degrees. The method is easy to operate, low in cost and environmentally friendly, the preparation process is not limited by the shape and size of the sample, and the method is easy to apply and popularize.

Description

technical field [0001] The invention relates to a method for preparing a superhydrophobic zinc-aluminum hydrotalcite coating on the surface of an aluminum alloy, belonging to the field of surface modification of metal materials. It specifically involves surface pretreatment, hydrothermal reaction and chemical modification of aluminum alloy, so as to obtain zinc-aluminum hydrotalcite coating with superhydrophobic function on the surface of aluminum alloy. Background technique [0002] With the rapid development of surface science and bionics, researchers have conducted in-depth research on superhydrophobic phenomena such as the "lotus leaf effect" in nature, and found that micro-nano structures and low surface energy substances are endowed to lotus leaves, water striders, etc. An important factor in the superhydrophobic properties of animal and plant surfaces. Inspired by this, the researchers used hydrothermal reaction method, anodic oxidation method, etching method, sol-ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C26/00
CPCC23C26/00
Inventor 赵严朱光于思荣王珺王丽媛刘林李权宋原吉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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