Graphene anticorrosive coating used in marine environment and preparation method of coating

Abstract

The invention discloses a preparation method of an anticorrosive coating used in a marine environment. The method comprises the following steps: dispersing an aniline monomer into 5-sulfosalicylic acid, performing ultrasonic treatment for 20-40 min, adding a graphene oxide aqueous solution, performing stirring for 20-40 min, performing ultrasonic treatment for 20-40 min, adding ammonium persulfatedropwise, and performing stirring for 11-13 h, wherein a molar ratio of the 5-sulfosalicylic acid to the aniline and a molar ratio of the ammonium persulfate to the aniline are both in a range of 4:5to 5:4; washing the solution obtained after stirring by using deionized water and ethanol for a plurality of times through suction filtration until the cleaning liquid is neutral; performing vacuum drying on the precipitate at 60-70 DEG C for 20-28 h to obtain a graphene oxide / polyaniline composite material; and after nano titanium dioxide is dispersed into the 5-sulfosalicylic acid with a concentration of 0.02-1 M, adding a graphene oxide / polyaniline composite solution with a concentration of 0.25-0.75 mg / ml, performing continuous stirring for 11-13 h, performing centrifugation, performing washing by using distilled water, performing washing by using ethanol, and performing drying to obtain graphene oxide / polyaniline / titanium dioxide composite nanopowder.

Description

technical field [0001] The invention relates to the field of graphene anticorrosion coatings, in particular to a graphene anticorrosion coating for marine environments and a preparation method thereof. Background technique [0002] In the marine environment, the surface corrosion of metal materials is very serious. There are not only chemical and electrochemical multiphase corrosion, but also microbial corrosion and mold corrosion. It is usually necessary to apply anti-corrosion coatings on the surface of metal materials. At present, most of the commonly used anti-corrosion coatings contain organic substances, which are prone to reactions in the marine environment and affect the service life of the coating; and the anti-microbial corrosion and mold corrosion are very weak; at the same time, they often contain a large amount of toxic heavy metals and volatile organic compounds (VOC). . Visible, there is stability not good enough in existing anticorrosion coating, the proble...

AI Technical Summary

Problems solved by technology

Most of the commonly used anti-corrosion coatings currently contain organic matter, which is prone to reaction in the marine environment and affects the service life of the coating; and the anti-microbial corrosion and mold corrosion are weak; at the same time, they often contain a large amount of toxic heavy metals and volatile organic compounds (VOC)

It can be seen that the existing anti-corrosion coatings are not stable enough and the anti-corrosion effect is not good enough.

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