Preparation method for corrosion-resistant and super-hydrophobic aluminum oxide membrane for zinc layer

An alumina and corrosion-resistant technology, which is used in the preparation of corrosion-resistant super-hydrophobic materials, can solve the problems of poor controllability of the size and shape of the micro-rough structure on the super-hydrophobic surface, and achieves improved corrosion resistance, improved corrosion resistance, and improved surface uniform effect

Inactive Publication Date: 2016-10-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, researchers have poor control over the size and shape of the microscopic rough structure of the superhydrophobic su

Method used

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  • Preparation method for corrosion-resistant and super-hydrophobic aluminum oxide membrane for zinc layer
  • Preparation method for corrosion-resistant and super-hydrophobic aluminum oxide membrane for zinc layer
  • Preparation method for corrosion-resistant and super-hydrophobic aluminum oxide membrane for zinc layer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The molar ratio of aluminum isopropoxide: water: ethyl acetoacetate: nitric acid is 1:300:1:0.5, take aluminum isopropoxide 11.35 g, water 300 g, ethyl acetoacetate 7.17 g, nitric acid (H + The molar ratio of water to water is 0.00167) 1.75 g, which are added to the three-necked flask in turn, and stirred at 85 °C for 1 h to obtain an alumina sol with uniform particle size and good dispersibility.

[0033] The zinc plate was immersed in the prepared alumina sol and etched for 2 h.

[0034] The etched zinc plate was modified by immersing in 167 mL / L hexamethyldisilazane solution for 2 h to obtain a superhydrophobic coating with a thickness of about 1 μm. The hydrophobic angle of the film is 153°, the sliding angle is less than 10°, and through the salt spray test, the time for 5% of the white rust area to appear is 99h, indicating that its corrosion resistance is good.

Embodiment 2

[0036] The molar ratio of aluminum isopropoxide: water: ethyl acetoacetate: nitric acid is 1:250:1:0.5, take aluminum isopropoxide 11.35 g, water 250 g, ethyl acetoacetate 7.17 g, nitric acid (H + Molar ratio of 0.002) to water, 1.75 g, was added to the three-necked flask in turn, and stirred at 80 °C for 2 h to obtain an alumina sol with uniform particle size and good dispersion.

[0037] The hot-dip galvanized sample was immersed in the prepared alumina sol and etched for 2 h.

[0038] The etched hot-dip galvanized sample was modified by immersing in 125mL / L hexamethyldisilazane solution for 2 h to obtain a superhydrophobic coating with a thickness of about 3um. The hydrophobic angle of the film is 157°, the sliding angle is less than 10°, and through the salt spray test, the time for 5% of the white rust area to appear is 106h, indicating that its corrosion resistance is good.

Embodiment 3

[0040] With the molar ratio of aluminum isopropoxide: water as 1:100, take 11.35 g of aluminum isopropoxide and 100 g of water into a three-necked flask in turn, and stir at 85°C for 24 hours to obtain an alumina sol with uniform particle size and good dispersibility.

[0041] The zinc plate was immersed in the prepared alumina sol and etched for 2 h.

[0042] The etched zinc plate was modified by immersing it in 100 mL / L hexamethyldisilazane solution for 2 h to obtain a superhydrophobic film with a thickness of about 3 μm. The hydrophobic angle of the film is 152°, the sliding angle is less than 10°, and through the salt spray test, the time for 5% of the white rust area to appear is 98h, indicating that its corrosion resistance is good. The contact angle photos and SEM photos of the superhydrophobic film layer prepared in this embodiment are respectively as follows figure 1 , image 3 shown. From image 3 It can be seen that a micro-nano-scale honeycomb structure with a ...

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Abstract

The invention discloses a preparation method for a corrosion-resistant and super-hydrophobic aluminum oxide membrane for a zinc layer. The method includes the steps of 1, adopting aluminum sources such as aluminum isopropoxide as a precursor, preparing aluminum oxide sol in a hydrolysis mode under the effect of catalysts, and placing samples into the sol or coating zinc with the sol for roughening surface structures; and 2, modifying the roughened zinc layer through low-surface energy modifying agents. The surface contact angle of the prepared super-hydrophobic membrane is greater than 150 degrees, and the slide angle of the prepared super-hydrophobic membrane is smaller than 10 degrees. According to the method, reaction conditions for preparing the super-hydrophobic membrane are mild, the surface is uniform, and the microcosmic nanostructures can be controlled by changing experiment parameters of sol preparation and dipping or coating means. The aluminum oxide membrane is arranged on the surface, and therefore the corrosion resistance of the zinc layer can be effectively improved. The membrane has the super-hydrophobic performance, and therefore the corrosion resistance of the zinc can be greatly improved.

Description

technical field [0001] The invention relates to the field of preparation of corrosion-resistant superhydrophobic materials, in particular to a method for preparing a zinc-layer corrosion-resistant aluminum oxide superhydrophobic film layer. Background technique [0002] Zinc is a metal commonly used in industry and is used in many fields such as construction, automobiles, aviation, and electronic equipment. But its nature is lively, the surface is easily corroded, and the corrosion of metals has produced huge losses in terms of economy and operation, so the anticorrosion work of zinc is particularly important. By preparing a "barrier layer" of aluminum oxide with a thickness of several to more than ten nanometers on the zinc layer, it can effectively block the contact between zinc and air and improve the corrosion resistance of the zinc layer. The application number is CN201210278314.9, which discloses a method for preparing an aluminum oxide film related to the field of th...

Claims

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Application Information

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IPC IPC(8): C23C18/12
CPCC23C18/1254C23C18/1295
Inventor 孔纲李晓聪赖德林车淳山
Owner SOUTH CHINA UNIV OF TECH
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