New anti-corrosion material graphene

New anti-corrosion material graphene

The corrosion of metal materials not only brings huge economic losses to the society, but also brings security risks to industrial production, transportation and household life.

To solve this problem, anti-corrosion coatings are often applied to the metal surface, which is convenient for construction and maintenance, and has low cost.

The principle is to use the coating to isolate corrosive media such as oxygen and water molecules after curing to form a film, so as to protect the substrate.

Graphene is a two-dimensional network carbon material formed by the hybridization of carbon atoms with sp2 orbitals, in which each carbon atom forms a C-C σ bond with its adjacent 3 carbon atoms, and is closely arranged in a regular hexagon to form a stable structure. .

The theoretical thickness of single-layer graphene is 0.35 nm, with a large specific surface area (up to 2630 m2/g), ultra-high mechanical properties (Young's modulus up to 1100 GPa, breaking strength up to 130 GPa), ultra-fast current carrying sub-mobility (up to 15 000 cm2/(V s)).

With these excellent properties, graphene has been widely used in the field of anti-corrosion.

Preparation method of graphene

The principle of the solvent exfoliation method is to disperse a small amount of graphite in a solvent to form a low-concentration dispersion liquid, and use the action of ultrasonic waves to destroy the van der Waals force between the graphite layers.

At this time, the solvent can be inserted between the graphite layers，Layer-by-layer exfoliation to obtain graphene.

This method does not destroy the structure of graphene like the oxidation-reduction method, and can prepare high-quality graphene.

The highest yield of graphene (approximately 8%) was found in nitrogen methyl pyrrolidone and conductivity is 6500S/m .

It is found that highly oriented thermally cracked graphite, thermally expanded graphite and microcrystalline artificial graphite are suitable for the preparation of graphene by solvent exfoliation.

The agent exfoliation method can prepare high-quality graphene, and the entire liquid phase exfoliation process does not introduce any defects on the surface of graphene, which provides a broad application prospect for its applications in microelectronics, multifunctional composite materials and other fields.

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