Silane/graphene oxide composite passivation solution and its preparation method and application

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: 2019-08-23
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 solution and its preparation method and application
  • Silane/graphene oxide composite passivation solution and its preparation method and application
  • Silane/graphene oxide composite passivation solution and its preparation method and application

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preparation example Construction

[0037] The preparation method of the silane / graphene oxide composite passivation solution of an embodiment of the present invention comprises 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 it to obtain a dispersion;

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

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

Embodiment 1

[0060] This embodiment provides a method for carrying out anti-corrosion treatment on the surface of the zinc flake, and the specific test process is as follows:

[0061] In a 200ml beaker, first add 10ml of absolute ethanol, then add 80ml of deionized water, then add 10ml of KH560 silane coupling agent, and stir well. Slowly add 50mg of graphene oxide, stir while adding, and then sonicate for 20min. Then add acetic acid to adjust the pH value to 3.3, stir evenly, seal and let it stand, and hydrolyze for 24 hours to obtain a passivation solution.

[0062] Grind the surface of the zinc sheet with metallographic sandpaper, polish it with a metallographic polishing machine, then ultrasonically wash it with distilled water, then wash it with absolute ethanol and deionized water in sequence, and after drying, immerse it in the above passivation solution at 20°C for 1 hour. , and then dried at 60°C for 6 hours, and cooled naturally to cover a layer of silane / graphene oxide composit...

Embodiment 2

[0064] This embodiment provides a method for carrying out anti-corrosion treatment on the surface of the zinc flake, and the specific test process is as follows:

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

[0066] Grind the surface of the zinc sheet with metallographic sandpaper, polish it with a metallographic polishing machine, then ultrasonically wash it with distilled water, then wash it with absolute ethanol and deionized water in turn, and immerse it in the above passivation solution for 2 hours at 20°C after drying. , and then dried at 180°C for 3 hours, and cooled naturally to cover a layer of silane / graphene oxide com...

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Abstract

A preparation method for a silane / graphene oxide composite passivation solution, comprising the following steps: mixing an aqueous silane coupling agent, water and an alcohol in a volume ratio of 1: (7-9): (0.8-1.2) to obtain a mixed solution; adding graphene oxide into the mixed solution, and performing ultrasonic treatment to obtain a dispersion solution; and adjusting the pH value of the dispersion solution to a pH value of 2-4, and carrying out hydrolyzation to obtain a silane / graphene oxide composite passivation solution. Further disclosed are a silane / graphene oxide composite passivation solution and a metal surface anti-corrosion method.

Description

technical field [0001] The invention relates to the technical field of metal anticorrosion, in particular to a silane / graphene oxide composite passivation solution and its preparation method and application. Background technique [0002] For a long time, the anticorrosion of metal materials has been a research hotspot in the field of material 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 treatment process is a traditional process for metal surface treatment, which is effective and widely used. However, due to the high toxicity of hexavalent chromium ions, it will not only cause environmental pollution, but also easily cause cancer. Therefore, the application of this traditional process is...

Claims

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Application Information

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Patent Type & Authority Patents(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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