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A method for preparing a superhydrophobic lithium aluminum hydrotalcite coating on the surface of an aluminum alloy porous oxide film

A technology of porous oxide film and aluminum alloy surface, applied in the direction of surface reaction electrolytic coating, metal material coating process, coating, etc., can solve the problems of difficult control of the reaction process, unfavorable popularization and application, and low production efficiency, and achieve the goal of reaction The effect of short time, easy promotion and application, and simple equipment

Active Publication Date: 2022-04-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium-aluminum hydrotalcite prepared by the co-precipitation method and hydrothermal reaction method disclosed in the above patents exists in a powder state, and the operation is complicated and the production efficiency is low. If it is to be applied to the superhydrophobic field, it needs to be processed by spraying, etc. The cost increases and the reaction process is difficult to control, which is not conducive to popularization and application
[0004] At present, there are few reports on the preparation of superhydrophobic coatings on the surface of aluminum alloys by using lithium aluminum hydrotalcites.

Method used

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  • A method for preparing a superhydrophobic lithium aluminum hydrotalcite coating on the surface of an aluminum alloy porous oxide film
  • A method for preparing a superhydrophobic lithium aluminum hydrotalcite coating on the surface of an aluminum alloy porous oxide film
  • A method for preparing a superhydrophobic lithium aluminum hydrotalcite coating on the surface of an aluminum alloy porous oxide film

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) Aluminum alloy surface pretreatment: The surface of the 6063 aluminum alloy sample with a size of 40mm×20mm×3mm was polished to light with 240#, 400#, 600#, 1000#, 1500#, 2000# silicon carbide sandpaper in sequence, Clean the surface of the sample with absolute ethanol, then ultrasonically clean it in deionized water and absolute ethanol for 10 minutes to remove surface impurities and oil stains, and then dry it with cold air for later use;

[0023] (2) Aluminum alloy surface anodic oxidation treatment: prepare 20mL of alkaline washing liquid containing 0.5mol / LNaOH and 100mL of electrolyte containing 0.5mol / L sulfuric acid and 0.06mol / L adipic acid; The aluminum alloy sample was washed with the prepared NaOH solution for 2 minutes, rinsed with deionized water for 15 seconds, and then used as the anode, and the graphite sheet with a size of 40mm×20mm×3mm was used as the cathode, and anodized at an oxidation voltage of 15V for 20 minutes, and the distance between the ...

Embodiment 2

[0027] (1) Aluminum alloy surface pretreatment: The surface of the 6063 aluminum alloy sample with a size of 40mm×20mm×3mm was polished to light with 240#, 400#, 600#, 1000#, 1500#, 2000# silicon carbide sandpaper in sequence, Clean the surface of the sample with absolute ethanol, then ultrasonically clean it in deionized water and absolute ethanol for 10 minutes to remove surface impurities and oil stains, and then dry it with cold air for later use;

[0028](2) Aluminum alloy surface anodic oxidation treatment: prepare 20mL of alkaline washing solution containing 0.5mol / LNaOH and 100mL of electrolyte solution containing 0.3mol / L sulfuric acid and 0.04mol / L adipic acid; The aluminum alloy sample was washed with the prepared NaOH solution for 2 minutes, rinsed with deionized water for 15 seconds, and then used as the anode, and the graphite sheet with a size of 40mm×20mm×3mm was used as the cathode, and anodized at an oxidation voltage of 10V for 15 minutes, and the distance be...

Embodiment 3

[0032] (1) Aluminum alloy surface pretreatment: The surface of the 6063 aluminum alloy sample with a size of 40mm×20mm×3mm was polished to light with 240#, 400#, 600#, 1000#, 1500#, 2000# silicon carbide sandpaper in sequence, Clean the surface of the sample with absolute ethanol, then ultrasonically clean it in deionized water and absolute ethanol for 10 minutes to remove surface impurities and oil stains, and then dry it with cold air for later use;

[0033] (2) Aluminum alloy surface anodic oxidation treatment: prepare 20mL of alkaline washing solution containing 0.5mol / LNaOH and 100mL of electrolyte solution containing 0.7mol / L sulfuric acid and 0.10mol / L adipic acid; The aluminum alloy sample was washed with the prepared NaOH solution for 2 minutes, rinsed with deionized water for 15 seconds, and then used as the anode, and the graphite sheet with a size of 40mm×20mm×3mm was used as the cathode, and anodized at an oxidation voltage of 20V for 25 minutes, and the distance b...

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Abstract

The invention relates to a method for preparing a superhydrophobic lithium-aluminum hydrotalcite coating on the surface of an aluminum alloy porous oxide film, and belongs to the field of surface modification of metal materials. Firstly, the aluminum alloy surface is pretreated and ultrasonically cleaned; then, the electrolyte solution is prepared, and the aluminum alloy sample is used as the anode, and the graphite is used as the cathode, and a porous oxide film is prepared on the aluminum alloy surface through an anodic oxidation process; then a certain concentration of carbonic acid is prepared Lithium aqueous solution, soak the sample prepared with porous oxide film in it, and heat it in a water bath for 25-35min, keep it at 40-60°C to obtain a lithium-aluminum hydrotalcite coating; finally, soak the sample in sodium laurate Chemical modification is carried out in the aqueous solution to reduce its surface energy and obtain superhydrophobic properties. The contact angle of deionized water on the coating surface exceeds 150°, and the rolling angle is lower than 10°. The method is simple in process, has no special requirements on the shape and size of the sample, is low in cost, and is easy to popularize.

Description

technical field [0001] The invention relates to a method for preparing a superhydrophobic lithium-aluminum hydrotalcite coating on the surface of an aluminum alloy porous oxide film, and belongs to the field of surface modification of metal materials. It specifically involves pretreatment, anodic oxidation treatment, in-situ growth of lithium aluminum hydrotalcite and low-energy chemical modification on the surface of aluminum alloy, so that the surface of aluminum alloy porous oxide film can obtain lithium aluminum hydrotalcite coating with superhydrophobic function method of preparation. Background technique [0002] With the development of surface engineering technology and bionics, researchers have studied the super-hydrophobic phenomenon of "lotus leaf effect" in nature, and found that the surface of lotus leaves, dragonfly wings, legs of water striders and other parts have super-hydrophobic properties , because most of its surfaces have micro-nano structures and low-e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/04C25D11/16C23C18/12
CPCC23C28/046C25D11/16C23C18/1204C23C18/1241C23C18/1295
Inventor 于思荣宋原吉朱光尹晓丽王丽媛王珺
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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