Abstract: Polymer/inorganic nanocomposites have attracted extensive research interests due to their unique properties. In order to obtain SiC composite coating material with excellent hydrophobic and anticorrosive performance, silicon carbide (SiC) nanoparticles were ammoniated by silane coupling agent (KH-550), and then the covalently functionalized SiC-sulfonated polyaniline (SiC-NH₂-SPANI) composites were synthesized by one-step oxidative polymerization of aniline, aminobenzenesulfonic acid and aminated SiC nanoparticles, the microstructure and morphology of the composites were characterizated by FT-IR, UV-vis, XRD and SEM. Finally, the SiC-NH₂-SPANI epoxy coating was coated on the substrate by spraying method and the hydrophobic and anticorrosion performance of the prepared coating was studied. The effects of the amount of different SiC nanoparticle, ammonium persulfate and the amount of the composite materials on the covalently functionalized silicon carbide-sulfonated polyaniline/epoxy resin anticorrosive composite coating (SiC-NH₂-SPANI/EP) was investigated. The results of hydrophobic property show that the contact angle value of the composite coating with 3wt%SiC-NH₂-SPANI reaches 99.87°, which is higher than that of the composite coating that used the pristine SiC substituted for SiC-NH₂. With regard to the influence of different reaction amount of SiC and ammonium persulfate, the anticorrosion performance of SiC-NH₂-SPANI/EP is the best when the mass ratio of 15wt%SiC-NH₂ to ammonium persulfate (APS) is 1 : 1. Among the composite coatings doped with different materials (SiC/EP, SiC-NH₂/EP and SiC-NH₂-SPANI/EP), the SiC-NH₂/EP coating has the largest contact angle, the best hydrophobic performance and anticorrosion performance. It also shows that there is a relationship between hydrophobic property and anticorrosion pro-perty and the hydrophobic performance is directly proportional to anticorrosive performance. With regard to the influence of the content of composite coatings, the long-term stability and corrosion resistance are more excellent when the addition of SiC-NH₂-SPANI/EP is 3wt%.