Graphene anticorrosion coatings have been widely used in various anticorrosion scenarios this year due to their obvious advantages. This article introduces the principle characteristics of graphene anticorrosion, which lies in its unique lamellar structure and the improvement of coating performance. As an attractive anti-corrosion material, the mechanism of graphene anti-corrosion is as follows:

1. The lamellar structure inhibits the infiltration, penetration and diffusion of corrosive media.

Graphene sheet can form a "labyrinth" shielding structure, effectively inhibit the infiltration, infiltration and diffusion of corrosive media, and improve the physical barrier properties of the coating. This strong barrier effect can resist the penetration of water, oxygen, chloride ions, etc. in the environment, blocking the pathway of primary cell formation, and slowing down the corrosion rate of the substrate.

2. Fill the pores of the coating, and enhance the denseness of the coating.

The size of graphene is extremely small, can be used to fill the gaps and pores of the coating, reduce the coating porosity, and enhance the denseness of the coating. This can further delay or prevent corrosion factors from leaching into the substrate surface, improving the protective effect of the coating.

3. Conductivity provides electrochemical protection

Graphene has good electrical conductivity, can form a conductive network, to provide better electrochemical protection. In the corrosive medium erosion, the traditional anti-corrosion coatings in the zinc powder oxidation reaction, the loss of electrons, resulting in a decrease in the conductivity of the coating, the loss of cathodic protection. After adding graphene, its lamellar structure can ensure better electrochemical contact between the coatings to avoid oxidation of zinc powder, thus maintaining the conductivity of the coating and cathodic protection.

4. Graphene's "hydrophobicity": Microcrystalline's graphene has strong hydrophobicity, which allows the coating surface to form a layer of water barrier, preventing water molecules from entering the metal surface, enhancing the protection of the metal and avoiding oxidation.

Summary: These advantages make graphene become a new type of anticorrosion material with great potential, widely used in coatings, plastics, rubber, electronics and other fields.

In practice, the application effect of graphene anti-corrosion has also been widely recognised. Studies have shown that coatings with added graphene can significantly improve anti-corrosion performance, reduce the occurrence of corrosion reactions and extend the service life of materials. For example, the application of graphene coating on steel in the marine environment can significantly reduce the corrosion rate and improve the durability of the steel structure. In addition, graphene anti-corrosion materials also have environmental advantages, non-toxic, harmless, non-polluting, in line with the requirements of sustainable development.

However, there are some challenges in the application of graphene anti-corrosion. For example, the preparation cost of graphene is high, and the production cost needs to be further reduced to improve its economy. In addition, the dispersion of graphene has an important impact on its application, and more effective dispersion methods need to be developed to ensure the uniform distribution of graphene in the coating.

In the future, with the continuous progress of graphene preparation and dispersion technology, as well as in-depth research and optimisation of its anti-corrosion principle, the application of graphene anti-corrosion will have greater potential. Its unique features and advantages will bring new opportunities and challenges to the fields of materials science, coating industry and anti-corrosion engineering.