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Method for preparing corrosion-resistant composite coating by using layer-by-layer self-assembly technology

A layer-by-layer self-assembly and composite coating technology, applied in coatings, anti-corrosion coatings, devices for coating liquids on surfaces, etc. The effect of short preparation time period, fast assembly speed and simple process

Active Publication Date: 2021-11-02
QINGHAI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the development of the magnesium alloy industry, the industrial requirements for the corrosion resistance of magnesium alloys are increasing, and the commonly used magnesium alloy protection technology can no longer meet the demand. Therefore, the corrosion-resistant composite coating and multi-layer coating technology has become the current research. Hotspots
[0003] Composite coating preparation technologies mainly include electroplating, sol-gel, thermal spraying, chemical vapor deposition, self-assembly and other methods, among which the electroplating method has great environmental pollution and sol-gel The preparation cost of the glue method is high, the thermal spraying method requires special equipment and the utilization rate of heat energy is low, the preparation speed of the chemical vapor deposition method is slow and the preparation coating is thin

Method used

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  • Method for preparing corrosion-resistant composite coating by using layer-by-layer self-assembly technology

Examples

Experimental program
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Embodiment 1

[0032] Example 1 The base material is a 2×2 mm magnesium alloy.

[0033] A method for preparing a corrosion-resistant composite coating utilizing layer-by-layer self-assembly technology, comprising the following steps:

[0034] (1) Use 400#-2000# sandpaper to polish the substrate in turn, use acetone, ethanol and deionized water to ultrasonically clean the magnesium alloy, and dry it in an oven for later use.

[0035] Immerse the dried substrate in a sodium hydroxide solution with a mass concentration of 5.66%, make the filling degree of the substrate and the sodium hydroxide solution 75% in an autoclave, conduct hydrothermal treatment at 160°C for 6 hours, and use a large amount of desiccant after taking it out Rinse with deionized water, blow dry with nitrogen and set aside. The SEM morphology of the surface under different magnifications is as follows: figure 1 As shown in the figure, it can be seen that after the hydrothermal treatment of sodium hydroxide solution, a roug...

Embodiment 2

[0042] Example 2 The base material is a 2×2mm magnesium alloy.

[0043] A method for preparing a corrosion-resistant composite coating utilizing layer-by-layer self-assembly technology, comprising the following steps:

[0044] (1) Polydopamine film is prepared with embodiment 1.

[0045] ⑵Preparation of nano-SiO 2 With embodiment 1.

[0046] nano-SiO 2 Dispersed in deionized water, prepared to a concentration of 1.0 mg / mL nano-SiO 2 Colloidal solution, use 1mol / L NaOH solution to SiO 2 Adjust the pH value of the colloid solution to 8.5, and soak the polydopamine film in nano-SiO 2 The self-assembly was carried out in the colloid solution at 37° C., and the self-assembly time was 24 hours. After taking it out, it was washed and dried to obtain a ceramic coating. The SEM morphology of the ceramic coating surface is as follows figure 2 As shown, it can be seen from the figure that the spherical nano-silica particles are uniformly deposited on the surface of the polydopami...

Embodiment 3

[0049] Example 3 The base material is a 2×2mm magnesium alloy.

[0050] A method for preparing a corrosion-resistant composite coating utilizing layer-by-layer self-assembly technology, comprising the following steps:

[0051] (1) Polydopamine film is prepared with embodiment 1.

[0052] (2) Disperse nano-titanium dioxide in deionized water to prepare a concentration of 0.1mg / mL nano-TiO 2 Colloidal solution, use 1mol / L NaOH solution to SiO 2 The pH value of the colloid solution was adjusted to 8.5, and the polydopamine film was immersed in nano-TiO 2 The self-assembly was carried out in the colloid solution at 37° C., and the self-assembly time was 24 hours. After taking it out, it was washed and dried to obtain a ceramic coating.

[0053] (3) Immerse the ceramic coating in the methyltrimethoxysilane solution, conduct self-assembly at 50°C for 2 hours, then take it out, rinse it with deionized water, and dry it to obtain a corrosion-resistant composite coating.

[0054] W...

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Abstract

The invention relates to a method for preparing a corrosion-resistant composite coating by using a layer-by-layer self-assembly technology. The method comprises the following steps of (1) immersing a treated substrate into a sodium hydroxide solution with the mass concentration of 5.66%, carrying out hydrothermal treatment, and immersing into a dopamine hydrochloride solution with the pH of 8-12 and the concentration of 0.1-3.0 mg / mL for self-assembly to obtain a polydopamine film; (2) soaking the polydopamine film in a nano ceramic colloidal solution for self-assembly to obtain a ceramic coating; and (3) soaking the ceramic coating in a methyltrimethoxysilane solution for self-assembly to obtain the corrosion-resistant composite coating. The method is simple in process, easy to operate, high in assembly speed and short in preparation time period, and the obtained coating material has good corrosion resistance, wear resistance and self-repairing performance.

Description

technical field [0001] The invention relates to the field of surface modification, in particular to a method for preparing a corrosion-resistant composite coating by using layer-by-layer self-assembly technology. Background technique [0002] Magnesium is currently the lightest industrial metal structure material with a density of 1.74g / cm 3 (about 1 / 4 of steel), has the advantages of high specific strength, specific stiffness, good shock absorption, electrical conductivity, dimensional stability and easy recycling. It is used in automobile manufacturing, aerospace, communication equipment, optical instruments, etc. fields have broad application prospects. However, the active chemical properties, low wear resistance and poor corrosion resistance of magnesium alloys greatly limit the wide application of magnesium alloys. Therefore, improving the wear resistance and corrosion resistance of magnesium alloys is a problem that must be solved to expand its application. At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/00B05D1/36B05D7/14C09D5/08C09D179/04C09D183/04
CPCB05D5/00B05D7/142B05D7/5883B05D1/36C09D179/04C09D5/08C09D183/04B05D2202/20B05D2518/00B05D2520/00
Inventor 李德燕王云思周双喜朱东海张金莲王晓雯
Owner QINGHAI UNIVERSITY
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