Corrosion Resistance of Anticorrosive Coatings of Epoxy Resin Modified by Nano SiO2-rare Elements

Modified nano SiO2 was prepared with situ adding rare metals of holmium nitrate, bait nitrate, samarium nitrate in the sol-gel procession. The synthesized products were dispersed in epoxy resin. The structure of the products were characterized by infrared spectrometer. The electrochemical impedance spectroscopy of modified epoxy resin composite coatings was tested in 3.5% NaCl solution. The results showed that the anticorrosion performance of the composite coating with adding nanometer SiO2-bait nitrate was the best.