Abstract: Aluminum and its alloys have a wide range of applications because of their excellent properties. However, aluminum is corroded in the actual application process. Therefore, the protection of aluminum is usually achieved by coating. Due to environmental protection requirements, the research of water-based coatings is becoming more and more important. This paper reported the preparation of functional latex particles containing phosphoric acid with core-shell structure used styrene and n-butyl acrylate as copolymers and vinyl phosphoric acid as functional monomers. The core-shell structure was accomplished by seed emulsion polymerization of where poly(styrene-co-butyl acrylate) seeds, pol(styrene-co-butyl acrylate-co- vinyl phosphonic) were used as shells. Latex particles with different phosphoric acid content, thermal decomposition temperature greater than 380 ℃, solid content (about 30%), uniform particle distribution and core-shell structure were prepared. The corrosion resistance of the coating was characterized by electrochemical polarization test and electrochemical impedance spectroscopy test. The corrosion potential of the coating could reach 1.7 V, the corrosion current also decreased, and the corrosion resistance was excellent, which proved the excellent corrosion resistance of aluminum. In electrochemical impedance spectroscopy tests, this functional coating has a high impedance in the frequency range of 10⁻² ~ 10⁵ Hz, which also proves that this coating can greatly slow down the corrosion rate.