Anti-corrosion carbon nanotube/silane composite super-hydrophobic coating and preparation method

A super-hydrophobic coating, carbon nanotube technology, applied in coatings, metal material coating processes, devices for coating liquid on surfaces, etc., can solve the problem of poor chromium-free passivation protection performance, endangering personal safety, corrosion resistance It can improve mechanical stability and wear resistance and save resources.

Active Publication Date: 2019-06-07
TIANJIN GONGDA GALVANIZING EQUIP CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor corrosion resistance of galvanized steel in hot and humid environment, and the current chromium-containing passivation endangers personal safety, pollutes the environment, and other problems such as poor protection performance of chromium-free passivation, and provides a carbon steel loaded with corrosion inhibitor. Nanotube modified silane composite super-hydrophobic functional coating to further improve the corrosion resistance of galvanized steel and endow it with self-cleaning, waterproof, anti-fouling, drag reduction, ice / snow and other multi-functional properties

Method used

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  • Anti-corrosion carbon nanotube/silane composite super-hydrophobic coating and preparation method

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preparation example Construction

[0033] A kind of preparation method of anticorrosion carbon nanotube / silane composite superhydrophobic coating of the present invention, comprises the following steps:

[0034] 1) Preparation of silane treatment solution: Add 4% to 5% (v / v) of silane coupling agent dropwise to deionized water (DI) / absolute ethanol (AE) mixed solution (DI:AE (v / v) v)=5~6:90), the mixed solution is placed on a magnetic stirrer and stirred at a rate of 600~1000rpm for 30~60min, and the pH value is adjusted to 5 by using 0.05~1mol / L glacial acetic acid, and then placed in Perform hydrolysis at room temperature for 3 to 6 days to obtain silane treatment solution;

[0035] 2) Preparation of multi-walled carbon nanotubes (MWCNTs) loaded with corrosion inhibitor: First, the purified MWCNTs were ultrasonically dispersed in a mixed solution of concentrated sulfuric acid (98%) / concentrated nitric acid with a volume ratio of 3:1, and ultrasonically dispersed at 140°C. Disperse for 3 hours, then wash with...

Embodiment 1

[0041] Prepared as described above,

[0042] To prepare vinyltriethoxysilane treatment solution, add vinyltriethoxysilane coupling agent 4% (v / v) dropwise to deionized water (DI) / absolute ethanol (AE) mixed solution ( DI:AE(v / v)=6:90), wherein the volume ratio of the vinyltriethoxysilane coupling agent: the mixed solution of deionized water and absolute ethanol is 4%; the mixed solution is placed under magnetic force Stir on the stirrer at 800rpm for 50min, adjust the pH value to 5 with 0.08mol / L glacial acetic acid, and then place it at room temperature for 5 days of hydrolysis to obtain the vinyltriethoxysilane treatment solution;

[0043] Preparation of corrosion inhibitor-loaded multi-walled carbon nanotubes (MWCNTs): Add 0.2 g of carboxylated multi-walled carbon nanotubes into 0.001 M cerium nitrate solution, ultrasonically disperse for 2 h, then filter and dry in an oven at 80 °C , to obtain multi-walled carbon nanotubes (MWCNTs) loaded with corrosion inhibitors;

[00...

Embodiment 2

[0049] Prepared as described above,

[0050] To prepare γ-aminopropyltriethoxysilane treatment solution, add 5% (v / v) of γ-aminopropyltriethoxysilane coupling agent to deionized water (DI) / absolute ethanol drop by drop (AE) In the mixed solution (DI:AE(v / v)=5:90), the volume ratio of the γ-aminopropyltriethoxysilane coupling agent: the mixed solution of deionized water and absolute ethanol is 5%; the mixed solution was placed on a magnetic stirrer and stirred at a rate of 800rpm for 50min, and the pH value was adjusted to 5 by using 0.08mol / L glacial acetic acid, and then it was placed at room temperature and hydrolyzed for 5 days to obtain γ-aminopropanol Base triethoxysilane treatment fluid;

[0051] Take 100ml of γ-aminopropyltriethoxysilane silane treatment solution, add 0.5g of carboxylated multi-walled carbon nanotubes into 0.003M cerium nitrate solution, ultrasonically disperse for 2 hours, then filter and dry in an oven at 60°C , to obtain multi-walled carbon nanotub...

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Abstract

The invention provides an anti-corrosion carbon nanotube / silane composite super-hydrophobic coating and a preparation method thereof. According to the anti-corrosion carbon nanotube / silane composite super-hydrophobic coating, environment-friendly pollution-free organosilane is adopted as a film forming agent; a multi-wall carbon nanotube loaded with a corrosion inhibitor is adopted as a carrier; afunctional surface with the super-hydrophobic property is prepared through a one-step dip-coating technology; a special wetting surface is organically combined with an environment-friendly silane passivation technology; and then, the anti-corrosion life of galvanized steel is greatly prolonged and the maintenance cost is reduced. The preparation method mainly comprises the following steps: immersing a degreased and hydroxylated galvanized steel substrate in a silane solution for 1-10 minutes' treatment, wherein the silane solution contains the carbon nanotube loaded with the corrosion inhibitor, inorganic nanoparticles and a low-surface-energy modifier; and then, taking out the galvanized steel substrate slowly, removing an excess liquid by adopting compressed air, carrying out cleaning by adopting absolute ethanol, and carrying out curing and firm forming for 10-40 minutes at 80-150 DEG C. The anti-corrosion carbon nanotube / silane composite super-hydrophobic coating provided by the invention is simple in preparation process and low in cost, has no limitation to the shapes and sizes of workpieces, is suitable for large-scale preparation, and is expected to develop into a novel environment-friendly surface treatment technology.

Description

technical field [0001] The invention belongs to the technical field of metal substrate surface functionalization and anti-corrosion treatment technology, and in particular relates to an anti-corrosion carbon nanotube / silane composite super-hydrophobic coating and a preparation method thereof. Background technique [0002] Galvanizing on the surface of steel is one of the commonly used anti-corrosion technologies for steel, which can provide both physical barrier protection and sacrificial anode protection for the steel substrate. However, for hot-dip galvanized steel structural parts that have been served in harsh environments such as high temperature, high humidity, industrial atmosphere or marine atmosphere for a long time, it is difficult to provide long-term and effective protection for steel even with galvanized anti-corrosion. Therefore, further protective treatment of the surface is usually required. At present, phosphating or chromate passivation treatment processes...

Claims

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Application Information

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IPC IPC(8): C23F15/00C23C26/00B05D3/04B05D5/08B05D7/14B05D7/24
Inventor 李冲冲曹晓明范永哲赵雪马瑞娜杜安
Owner TIANJIN GONGDA GALVANIZING EQUIP CO LTD
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