▎ 摘　　要

The graphene-reinforced chemically bonded phosphate ceramics (GCBPCs) are prepared on A3 steel. X-ray diffraction and Raman spectra are used to analyze the GCBPCs. The curing kinetics of GCBPCs are also analyzed with differential scanning calorimetry, and the microstructures are tested by scanning electron microscope. It is found that AlPO4 and Zn-3(PO4)(2) are the main binding phases in GCBPCs. And there is no reaction between graphene and composites. However, the enthalpies of curing increase with the increase in graphene. And ceramic platelets are found with adding graphene because the gel that produces in the curing process crystallizes around the graphene into ceramic platelets. In addition, electrochemical tests are conducted to investigate the corrosion behavior of GCBPCs. The corrosion current densities decrease from 2.76E-6 to 1.21E-7 A/cm(2), and the protection efficiency increases from 33.81 to 97.10 % with the increase in graphene. Besides, the charge transfer resistance and resistance of coatings also increase with the increase in graphene. The corrosion mechanism of the GCBPCs is investigated based on the corrosion behavior and microstructural characterizations. The excellent corrosion resistance is mainly contributed by the graphene platelets and the ceramic platelets that form in the curing process. These platelets block the diffusion pathway and make the pathway more tortuous, which can effectively prevent H2O, O-2 and Cl- from accessing the substrate. In GCBPC0, the H2O, O-2 and Cl- accessed the substrate through the diffusion pathway without resistance. In GCPBC5, the diffusion pathway was blocked t and made more tortuous by the graphene platelets and ceramic platelets formed.