Surface preservative treatment method for aviation aluminium alloy material

The invention discloses a method for forming one layer of sol-gel coating with a compact reticular crosslinking structure on the surface of the aviation aluminium alloy substrate material. The coating and an atom on the surface of the aluminium alloy substrate material can be firmly combined by the action of a chemical bond, and the coating has good adhesive force on the substrate material. In the method, graphene is added in a coating ingredient to participate in the crosslinking structure, and therefore the anti-corrosion capability of the coating is enhanced. The coating prepared by the method has strong anti-corrosion capability and adhesive force on the surface of aviation aluminium alloy. In addition, the coating has good chemical stability and thermal stability and can resist the influence on the coating because of an external acid and alkaline environment and temperature variation. The method is simple, is convenient to operate, has low requirement on equipment, is environmentally friendly and is free from pollution.