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A kind of graphite oxide corrosion inhibitor and its preparation and application

A technology of corrosion inhibitor and graphene, applied in the fields of carbon compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of pinholes and toxic collapse of corrosion inhibitors, and achieve the effects of simple operation, low toxicity and high efficiency

Active Publication Date: 2019-12-10
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a graphene oxide corrosion inhibitor and its preparation and application, to solve the problem that the corrosion inhibitors in the prior art have certain toxicity and the occurrence of "collapse" and "pinholes" in the process of self-assembly and film formation. Phenomena technical problems

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  • A kind of graphite oxide corrosion inhibitor and its preparation and application

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Effect test

Embodiment 1

[0034] Preparation of graphene oxide grafted melamine corrosion inhibitor: First, mix 50 mg graphene oxide prepared by Hummers method in dimethylformamide to form a suspension with a concentration of 0.1 mg / mL, and ultrasonically disperse it under 200W power 3 hours. Add 50mg of melamine and 100mg of dicyclohexylcarbodiimide, and keep stirring for 24 hours at 50°C. Finally, centrifugation is carried out, and the supernatant is obtained as a solution containing graphene oxide grafted with melamine.

[0035] Self-assembly process of graphene oxide grafted melamine corrosion inhibitor: put the pretreated copper into the solution containing graphene oxide grafted melamine, and after soaking at room temperature for 8 hours, a corrosion inhibition film is formed on the copper surface.

[0036] The Tafel polarization curve is tested by the electrochemical workstation, and the corrosion inhibition efficiency can be calculated as 78.1%.

Embodiment 2

[0038] Preparation of graphene oxide grafted melamine corrosion inhibitor: First, mix 50 mg graphene oxide prepared by Hummers method in dimethylformamide to form a suspension with a concentration of 0.1 mg / mL, and ultrasonically disperse it under 200W power 3 hours. Add 100 mg of melamine and 100 mg of dicyclohexylcarbodiimide, and continue stirring for 24 hours at 50° C. to react. Finally, centrifugation is carried out, and the supernatant is obtained as a solution containing graphene oxide grafted with melamine.

[0039] Self-assembly process of graphene oxide grafted melamine corrosion inhibitor: put the pretreated copper into the solution containing graphene oxide grafted melamine, and after soaking at room temperature for 16 hours, a corrosion inhibition film is formed on the copper surface.

[0040] According to the Tafel polarization curve tested by the electrochemical workstation, it can be calculated that its corrosion inhibition efficiency is 86.9%.

Embodiment 3

[0042] Preparation of graphene oxide grafted melamine corrosion inhibitor: First, mix 50 mg graphene oxide prepared by Hummers method in dimethylformamide to form a suspension with a concentration of 0.1 mg / mL, and ultrasonically disperse it under 200W power 3 hours. Add 50mg of melamine and 200mg of dicyclohexylcarbodiimide, and keep stirring for 24 hours at 50°C. Finally, centrifugation is carried out, and the supernatant is obtained as a solution containing graphene oxide grafted with melamine.

[0043] Self-assembly process of graphene oxide grafted melamine corrosion inhibitor: put the pretreated copper into the solution containing graphene oxide grafted melamine, and after soaking at room temperature for 24 hours, a corrosion inhibition film is formed on the copper surface.

[0044] According to the Tafel polarization curve tested by the electrochemical workstation, it can be calculated that its corrosion inhibition efficiency is 70.7%.

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Abstract

The invention discloses a graphene oxide corrosion inhibitor and preparation and application thereof. Melamine is grafted on graphene oxide in the graphene oxide corrosion inhibitor. According to thegraphene oxide corrosion inhibitor, the melamine is grafted on the graphene oxide, and compared with other corrosion inhibitors, the melamine is inexpensive and less in pollution to the environment. The advantages of graphene and a self-assembly technology are combined through the melamine, the phenomena of collapse and pinhole in the self-assembly film forming process of corrosion inhibitor molecules can be avoided, the surface of copper can be more tightly and completely covered with the graphene under the effects of graphene interlayer hydrogen bonds and pi-pi bonds, and the excellent anti-corrosion effect is achieved. The corrosion inhibitor can be self-assembled on the surface of the copper in a solvent, and corrosion of the copper in seawater or a sodium chloride solution can be relieved to a certain extent. The corrosion inhibitor has the characteristics of small dosage, small toxicity, easy and convenient operation and high efficiency.

Description

technical field [0001] The invention relates to the technical field of corrosion inhibitors. More specifically, it relates to a graphene oxide corrosion inhibitor and its preparation and application. Background technique [0002] At present, the application of graphene in the anti-corrosion field is mainly based on physical barriers, but as long as there are slight cracks or scratches in the graphene coating, it will accelerate the local electrochemical corrosion, the corrosion rate in the exposed area will be greatly accelerated, and the corrosion rate of the metal will be reduced. Properties such as strength and toughness. Therefore, how to realize the complete coverage of graphene on the metal surface becomes the key to its anti-corrosion application. [0003] Self-assembled membranes (SAMs) technology can be applied in the field of anti-corrosion. However, most corrosion inhibitors have certain toxicity, and the phenomena of "collapse" and "pinhole" often appear in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/18C01B32/198
CPCC01B32/198C23F11/18
Inventor 李樾王凤奇黄勇杨辉
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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