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Graphene anticorrosion aqueous coating for magnesium alloy, and preparation method and application thereof

A water-based coating and graphene technology, applied in anti-corrosion coatings, coatings, devices for coating liquids on surfaces, etc., can solve the problems of physical health threats to constructors, poor dispersion stability of pigments and fillers, hindering metal protection applications, etc. The effect of high ecological value and popularization and application value, good dispersion and low preparation cost

Pending Publication Date: 2020-03-31
JIANGSU ANNATAI ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In previous reports, methods such as ion sputtering (CN 105568243 A) and chemical vapor deposition (CN105568243 A) are used to directly form anti-corrosion coatings on metal surfaces. These methods have high requirements for equipment and low production efficiency
Although graphene is an excellent protective material, it also has adverse side effects, which means that graphene will aggravate metal corrosion, and this effect may hinder its application in metal protection
[0004] The graphene anti-corrosion coatings in the prior art are usually oil-based coatings, which need to add a large amount of volatile solvents, which are easy to pollute the environment and pose a threat to the health of the builders. agglomeration, and even produce more micropores, and its dispersion uniformity is also the bottleneck for the widespread use of graphene
In recent years, water-based anti-corrosion coatings have appeared on the market. This type of coating has the advantages of good environmental protection, but generally has a short anti-corrosion period, high requirements for surface treatment, poor dispersion stability of pigments and fillers, and flashing after coating. Eclipse and other issues

Method used

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  • Graphene anticorrosion aqueous coating for magnesium alloy, and preparation method and application thereof
  • Graphene anticorrosion aqueous coating for magnesium alloy, and preparation method and application thereof
  • Graphene anticorrosion aqueous coating for magnesium alloy, and preparation method and application thereof

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preparation example Construction

[0021] The invention relates to a method for preparing a graphene anti-corrosion water-based coating for magnesium alloys, which is characterized in that it comprises the following steps: firstly prepare a graphene / methyltrimethoxysilane dispersion, and then coat the surface of the AZ91D magnesium alloy with 2- The 3-layer graphene / methyltrimethoxysilane dispersion is coated by rod coating, and then dried and cured in a drying oven at 80-100°C to obtain a graphene anti-corrosion water-based coating for magnesium alloys.

[0022] Further, the preparation method of the graphene oxide / methyltrimethoxysilane dispersion comprises the following steps: uniformly mixing graphene oxide, methyltrimethoxysilane, absolute ethanol and deionized water to obtain a mixed material , and then add polyethylene glycol therein, and continue stirring for 20-30 minutes to obtain a graphene oxide / methyltrimethoxysilane dispersion.

[0023] Preferably, the volume ratio of graphene oxide, methyltrimeth...

Embodiment 1

[0030] Embodiment 1 provides a kind of preparation method of graphene anticorrosion water-based coating for magnesium alloy, comprises the steps:

[0031] 1) Pretreatment, the steps are as follows: grind the AZ91D magnesium alloy with sandpaper, polish, ultrasonically clean, then rinse with distilled water, and ultrasonically clean with absolute ethanol for 15 minutes.

[0032] 2) Preparation of graphene oxide / methyltrimethoxysilane dispersion: add 80ml of deionized water, 4ml of methyltrimethoxysilane and 12ml of absolute ethanol into a 100ml beaker, and stir magnetically for 15min at a temperature of 25°C , then add 0.8ml graphene oxide (1mg / ml) and 0.05% polyethylene glycol and continue to stir for 50min to obtain a mixed solution, and finally process the mixed solution by centrifugation to obtain graphene oxide / methyltrimethoxysilane Dispersions;

[0033] 3) Preparation of graphene oxide composite coating: apply graphene oxide / methyltrimethoxysilane dispersion on the surf...

Embodiment 2

[0036] Embodiment 2 provides a kind of preparation method of graphene anticorrosion water-based coating for magnesium alloy, comprises the steps:

[0037] 1) Pretreatment, the steps are as follows: The sample material used in Example 2 is AZ91D magnesium alloy, which is ground, polished, and ultrasonically cleaned with 2000# sandpaper, then rinsed with distilled water, and ultrasonically cleaned with absolute ethanol for 10 minutes.

[0038] 2) Preparation of graphene oxide / methyltrimethoxysilane dispersion: add 80ml of deionized water, 4ml of methyltrimethoxysilane and 12ml of absolute ethanol into a 100ml beaker, and stir magnetically for 15min at a temperature of 25°C , then add 2ml graphene oxide (1mg / ml) and 0.05% polyethylene glycol and continue to stir for 50min to obtain a mixed solution, and finally process the mixed solution by an off-method to obtain a graphene oxide / methyltrimethoxysilane dispersion body;

[0039] 3) Preparation of graphene oxide composite coating...

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Abstract

The invention relates to a preparation method of a graphene anticorrosion aqueous coating for magnesium alloy, which includes steps of: preparing a graphene / methyltrimethoxysilane dispersion, coatingthe surface of AZ91D magnesium alloy with the graphene / methyltrimethoxysilane dispersion by 2-3 layers particularly in a rod-coating manner, and drying and curing the coating in a drying box at 80-100DEG C. The invention further discloses the graphene anticorrosion aqueous coating for magnesium alloy, which is prepared through the method, and the applications of the coating on a magnesium alloy product surface. In the coating, the methyltrimethoxysilane is bonded to the graphene oxide lamella, so that the composite graphene oxide coating has better anticorrosion effect. The product greatly improves the anticorrosion effect of the magnesium alloy, is low in cost, is simple in preparation method, is free of heavy metal ions and satisfies ecological and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of new chemical materials, and relates to a metal surface treatment technology, in particular to a graphene anti-corrosion water-based coating for magnesium alloys and a preparation method and application thereof. Background technique [0002] Magnesium has the characteristics of low density (its density is 1.74g / cm3, which is only 2 / 3 of aluminum and 1 / 4 of iron), and the magnesium alloy products made of it have high specific strength and rigidity, and have excellent electromagnetic shielding performance and thermal conductivity. Conductive properties, known as green engineering materials in the 21st century, have broad application prospects in the fields of communication, electronics, automobiles, weapons and equipment, and aerospace. However, due to the poor corrosion performance of magnesium alloys, the research on the surface anticorrosion of magnesium alloys is particularly important. In the prior art...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C09D5/08C09D7/61B05D7/14B05D7/24
CPCC09D183/04C09D4/00C09D5/08C09D7/61B05D7/14B05D7/24B05D2202/20C08G77/04C08K3/042
Inventor 谢晓峰
Owner JIANGSU ANNATAI ENVIRONMENTAL PROTECTION TECH CO LTD
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