Anti-corrosion coating applied to aluminum alloy surface as well as preparation method and application of anti-corrosion coating

The invention discloses an anticorrosive coating applied to an aluminum alloy surface as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing an Al2O3 layer on the surface of an aluminum alloy matrix by adopting a micro-arc oxidation method; and a TiO2 modified magnesium-rich epoxy resin layer is formed on the Al2O3 layer by adopting a coating method, so that the Al2O3 layer/epoxy resin composite anticorrosive coating is formed on the surface of the aluminum alloy. According to the invention, the photo-generated cathode protection effect of the TiO2 nanoparticles is combined with the sacrificial anode protection effect of the magnesium-rich coating on the aluminum alloy, so that the coating has an excellent long-time marine anticorrosion function, and an environment-friendly and long-acting protection effect is realized. The method disclosed by the invention is simple to operate, controllable in reaction and environment-friendly, and the prepare