Graphene composites have made progress in the field of aluminum alloy corrosion protection

Recently, by the park enterprise China Aerospace Construction Engineering Co., LTD., the district division three expenses project "a GO/PANI/TiO2 based water-based nano coating anti-corrosion process in aluminum alloy corrosion protection application research" successfully passed the final acceptance.

Graphene is a flat film made of carbon atoms that is only one carbon atom thick and almost completely transparent. Graphene composites have the characteristics of high strength, good toughness, excellent electrical and thermal conductivity, etc., and have broad application prospects in aerospace, electronics, shipbuilding, new energy, environmental purification and other fields.

Due to the advantages of large reserves, high specific strength and good machining performance, aluminum alloy has been widely used in modern industry, military aerospace and civil fields. However, the corrosion of aluminum alloy greatly reduces the safety of the product and brings huge economic losses. Therefore, it is of great economic and practical significance to do a good job in corrosion protection of aluminum alloy materials.

Through the combination of self-made water-soluble nano-coating materials with rare earth passivation and graphene oxide, the project has a relatively obvious improvement effect on aluminum alloy corrosion protection. Among them, graphene alleviates the pollution of organic matter emissions to the environment, improves the environmental aging resistance of the coating itself, and rare earth replaces toxic hexavalent chromium, optimizing the surface treatment technology. Its green characteristics are very much in line with the concept of innovation and sustainable development put forward in China's "13th Five-Year Plan" development.

Specifically, the high specific surface area and large surface active site of graphene oxide can effectively improve the dissolution and dispersion performance of polyaniline in water-based environment, while the layer stacking structure of ultra-thin graphene can effectively isolate the channel of corrosive media to the metal surface, improving the corrosion resistance of metal materials.

In the surface treatment process, the use of rare earth, hydrogen peroxide and gelatin to form a simple passivation system, basically achieve chromic acid passivation effect, the process is simple to operate, low energy consumption, little impact on the environment.

This year is the first year of the "13th Five-Year Plan", and the independent innovation research and application of graphene composite materials is expected to set off a new round of industrial development boom and promote the transformation and upgrading of related industries.