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Process of preparing graphene coating on surface of metal

A metal surface and graphene technology, applied in the field of reactor engineering, can solve the problems of zirconium alloy hydrogen embrittlement, inconvenient operation, side reactions, etc., and achieve the effect of ensuring firmness, small thickness unevenness, and good compactness

Active Publication Date: 2019-01-11
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the method of preparing graphene protective layer on metal surface mainly adopts chemical vapor deposition method, which has high temperature, inconvenient operation, and sometimes causes side reactions
For example, if the coating is prepared on the inner wall of the zirconium alloy, the chemical vapor deposition method needs to introduce hydrogen as the reaction condition, which will cause severe hydrogen embrittlement of the zirconium alloy.

Method used

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  • Process of preparing graphene coating on surface of metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of technique that graphene coating is coated on metal surface, and this technique comprises the following several steps, and metal is zirconium alloy in the present embodiment, and shape is tubular:

[0037] (1) Metal surface pretreatment

[0038] Soak and ultrasonically clean the inner and outer surfaces of the metal with a solvent to remove surface impurities and oil stains; the solvent can be one or more of acetone, ethanol, deionized water, ultrapure water, and alkaline solution. The impurities and oil stains on the inner and outer surfaces of the metal can be removed by using the solvent, so that the graphene oxide can be better adsorbed on the inner and outer surfaces of the metal.

[0039] (2) The number of layers is 1 to 10 layers, and the graphene oxide aqueous solution with a mass fraction of 1.5 wt% soaks the metal sample described in step (1) for 20 minutes, so that the graphene oxide aqueous solution completely covers the inner and outer surfaces of ...

Embodiment 2

[0045] The difference from Example 1 is that the solvent in the step (1) is ethanol and potassium hydroxide solution, and the cleaning sequence is to soak in ethanol solution for 60 minutes, ultrasonic cleaning, and then soak in potassium hydroxide solution, ultrasonic Wash to remove surface oil and impurities. This step removes surface oil and impurities very thoroughly, ensuring successful coating of the graphene coating, and the unevenness of the coating thickness is less than 5%. The concentration of potassium hydroxide is 0.1mol / L. In the step (2), the number of layers selected is 20 to 50 layers, and the graphene oxide aqueous solution with a mass fraction of 10 wt% is sprayed on the metal sample; in the step (3), the drying temperature is 40° C., and the drying time is 72 hours , The dry environment is a low pressure protection environment of 0.05Pa. The reducing agent in step (4) is hydrazine, the microwave power range is 800W, the reducing temperature is 60°C, and t...

Embodiment 3

[0047]Different from Example 1, the solvent in the step (1) is ethanol and potassium hydroxide solution, and the cleaning sequence is to soak in ethanol solution for 40 minutes, ultrasonic cleaning, and then soak in potassium hydroxide solution, ultrasonic Wash to remove surface oil and impurities. The concentration of potassium hydroxide is 0.8mol / L. In the step (2), the graphene oxide aqueous solution with a mass fraction of 50 to 100 layers and a mass fraction of 0.1 wt% is selected for use in the step (2), and the metal sample is coated with a hanging brush; in the step (3), the drying temperature is 150° C., The drying time is 30 minutes, and the drying environment is air. In the step (4), the reducing agent is sodium hydrogen borate, and the reducing agent is ascorbic acid, hydrazine, sodium hydrogen borate or hydroiodic acid. The microwave power range is 1000W, the reduction temperature is 190 ° C, and the reduction time is 10 minutes; The cleaning agent is acetone. ...

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Abstract

The invention belongs to the technical field of reactor engineering, and in particular relates to a process of preparing a graphene coating on the surface of a metal. The process comprises the following steps: (1) pre-treatment of the surface of the metal; (2) soaking, spraying or hang-brushing the metal with a graphene oxide aqueous solution; (3) roasting and drying the metal; (4) microwave reductive treatment; and (5) cleaning the metal with a cleaning agent and the like. The process has the beneficial effects of being free of introduction of hydrogen, simple to operate, good in compactnessof the coating, firm in combination of the coating and a matrix.

Description

technical field [0001] The disclosure belongs to the technical field of reactor engineering, and in particular relates to a process for preparing a graphene coating on a metal surface. Background technique [0002] With the development of the national economy, the corrosion of high-tech equipment and precision equipment such as nuclear power, high-speed rail, aviation, aerospace, and electronic components has become a major factor affecting equipment performance and restricting its economy and safety. The coating on the surface of the material can inhibit the corrosion of the material and improve the temperature resistance of the material. However, at present, the preparation of coatings has disadvantages such as complex equipment, high cost, great environmental hazards, and poor long-term performance in harsh environments. For example, preparing an anti-corrosion coating on the surface of reactor fuel cladding and making it into a coated zirconium alloy is one of the impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/16
CPCC23C18/1637C23C18/1655C01B32/184C23C24/082C23C26/00C23G5/00C23G5/024C23G1/14Y02E30/30B05D7/14B05D3/029B05D3/102C23G1/205C23G1/19C23C18/1806
Inventor 海正银田国新许倩辛长胜杨素亮王辉
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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