Silane/graphene oxide composite passivation liquid and preparing method and application thereof

A graphene composite and passivation solution technology, which is applied in the coating process of metal materials, etc., can solve the problems of inability to achieve protective effects, difficult processing and molding, poor bonding, etc., achieve excellent anti-corrosion effects, easy to operate, and easy to prepare The effect of simple process

Active Publication Date: 2018-10-12
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphene films prepared by chemical vapor deposition (CVD) have certain corrosion resistance, but currently CVD technology can only prepare graphene films on specific metal surfaces such as Cu or Cu / Ni alloys, and the graphene films are uniform. It is a single layer or few layers, and it cannot play a long-term protective effect
Single-component graphene is prone to agglomeration and difficult to process and shape, which limits the application of graphene
Graphene oxide has a planar structure similar to graphene, and the surface contains a large number of active groups. The presence of oxygen-containing functional groups (carboxyl, hydroxyl, epoxy, etc.) makes graphene oxide have strong hydrophilicity and stable Dispersed in polar reagents, but a single graphene oxide film layer is poorly bonded to metal substrates
[0005] At present, there are existing research reports on the use of silane and graphene oxide composites to make passivation films on metal surfaces. The film layer that can be obtained by treating the metal surface by dipping or coating has a small thickness and is not well bonded to the metal surface. Close and other issues, can not play a long-term protective effect

Method used

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  • Silane/graphene oxide composite passivation liquid and preparing method and application thereof
  • Silane/graphene oxide composite passivation liquid and preparing method and application thereof
  • Silane/graphene oxide composite passivation liquid and preparing method and application thereof

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Effect test

preparation example Construction

[0037] The preparation method of the silane / graphene oxide composite passivation solution according to an embodiment of the present invention includes the following steps:

[0038] Mix the water-based silane coupling agent, water and alcohol in a volume ratio of 1: (7-9): (0.8-1.2) to obtain a mixed solution;

[0039] Add graphene oxide to the mixed solution, and ultrasonically treat to obtain a dispersion;

[0040] Adjust the pH of the dispersion to a pH of 2 to 4, and perform hydrolysis to obtain a silane / graphene oxide composite passivation solution.

[0041] The preparation method of the above silane / graphene oxide composite passivation solution combines the advantages of both graphene oxide and silane, and utilizes the cohydrolysis of graphene oxide and water-based silane coupling agent to realize the silane functionalization and silane coupling of graphene oxide Covalent bonds can be formed between the agent and the metal substrate, which is beneficial to improve the bonding for...

Embodiment 1

[0060] This embodiment provides a method for anti-corrosion treatment on the surface of zinc flakes. The specific test process is as follows:

[0061] In a 200ml beaker, first add 10ml of absolute ethanol, then add 80ml of deionized water, and then add 10ml of KH560 silane coupling agent, and stir well. Then slowly add 50 mg of graphene oxide, stirring while adding, and then ultrasonic for 20 minutes. Then add acetic acid to adjust the pH to 3.3, stir evenly, seal and stand still, and hydrolyze for 24 hours to obtain passivation liquid.

[0062] Polish the surface of the zinc sheet with metallographic sandpaper, polish with a metallographic polishing machine, and then ultrasonically wash with distilled water, and then wash with absolute ethanol and deionized water in turn, and then immerse in the above passivation solution for 1 hour at 20°C after drying. , And then dried at 60 ℃ for 6 hours, natural cooling is to cover a layer of silane / graphene oxide composite passivation film o...

Embodiment 2

[0064] This embodiment provides a method for anti-corrosion treatment on the surface of zinc flakes. The specific test process is as follows:

[0065] In a 200ml beaker, first add 10ml of absolute ethanol, then add 80ml of deionized water, and then add 10ml of KH560 silane coupling agent, and stir well. Then slowly add 80 mg of graphene oxide, stirring while adding, and then ultrasonic for 30 min. Then add acetic acid to adjust the pH to 3.3, stir evenly, seal and stand still, and hydrolyze for 24 hours to obtain passivation liquid.

[0066] Polish the surface of the zinc flakes with metallographic sandpaper, polish with a metallographic polishing machine, and then ultrasonically wash with distilled water, then wash with absolute ethanol and deionized water in turn, dry and immerse in the above passivation solution at 20℃ for 2h. , And then dried at 180 ℃ for 3 hours, natural cooling is to cover a layer of silane / graphene oxide composite passivation film on the surface of the zinc...

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Abstract

The invention relates to silane / graphene oxide composite passivation liquid and a preparing method and application thereof. The preparing method comprises the following steps that a water-based silanecoupling agent, water and alcohol are mixed according to the volume ratio being 1:(7-9):(0.8-1.2) to obtain mixing liquid; graphene oxide is added into the mixing liquid, and ultrasonic treatment iscarried out to obtain dispersion liquid; the pH value of the dispersion liquid is adjusted to be 2-4, and hydrolysis is carried out to obtain the silane / graphene oxide composite passivation liquid. The silane / graphene oxide composite passivation liquid and the preparing method of the silane / graphene oxide composite passivation liquid combine advantages of the graphene oxide and silane, the graphene oxide and the water-based silane coupling agent are used for joint hydrolysis, and the silane functionalization of the graphene oxide is achieved; and the silane coupling agent and a metal substrateform covalent bonds, the bonding force between a film layer and the metal substrate is improved, and the lamellar graphene oxide can strengthen the physic shielding property of the film layer on a corrosion medium.

Description

Technical field [0001] The invention relates to the technical field of metal anti-corrosion, in particular to a silane / graphene oxide composite passivation liquid and a preparation method and application thereof. Background technique [0002] For a long time, the anti-corrosion of metal materials has been a research hotspot in the field of materials science. The most commonly used corrosion protection method is to cover the metal surface with another organic, inorganic or composite film as a protective layer through physical, chemical or electrochemical processes. , With the help of this protective layer to prevent or slow down metal corrosion. Among them, the chromate passivation process is a traditional process for metal surface treatment, which has good effects and is widely used. However, due to the high toxicity of hexavalent chromium ions, it not only causes environmental pollution, but is also prone to carcinogenesis. Therefore, the traditional process is gradually restric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/53C23C22/50C23C22/48C23C22/73C23C22/78
CPCC23C22/48C23C22/50C23C22/53C23C22/73C23C22/78
Inventor 张双红杨波陈平李茂东孔纲黄国家翟伟王志刚
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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