装载缓蚀剂的纳米SiO 2 对环氧涂层耐腐蚀性的影响

The 8-hydroxyquinoline (8Q), as a sustained-release corrosion inhibitor was deposited onto nano-particles of mesoporous-silica to prepare 8-hydroxyquinoline-silica (8Q-SiO2) powder. Then the powder was used as pigment to modify epoxy resin to prepare 8Q-SiO2-epoxy resin coat- ing. The prepared 8Q-SiO2was characterized by means of infrared spectrum and ultraviolet absorp- tion spectrum. The corrosion performance of the 8Q-SiO2-epoxy resin coating was examined by salt spray test and electrochemical impedance measurement. The results revealed that the 8Q can enhance the corrosion resistance of epoxy coating, and among others the epoxy coating with 5% (mass fraction) 8Q-SiO2 exhibits the highest corrosion resistance, which may be ascribed to that the 8Q may slowly release from the mesoscopic channels within SiO2 into the epoxy coating and then arrive at the interface coating/substrate to provide corrosion inhibition for the substrate.