[Introduction]A coating with moderate performance needs to be applied for corrosion protection to Mg-Li alloy which has high chemical activity.It should have no adverse effects on Mg-Li alloy while preventing the invasion of corrosive media.[Method]Graphene oxide(GO)was modified with phytic acid by phosphatization in hydrothermal condition,forming phytic acid-modified graphene oxide(PGO).The structures and morphologies of GO and PGO were characterized by Fourier-transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD),and scanning electron microscopy(SEM).1%of GO and PGO was added to silica sol respectively to prepare a GO-silica sol composite coating and a PGO-silica sol composite coating on Mg-Li alloy surface.The effects of GO and PGO on the anticorrosion performance of the composite coatings were studied.[Result]The corrosion resistance of PGO-silica sol composite coating was better than that of pure silica sol coating and PG-silica sol composite coating.[Conclusion]The phytic acid-modified GO has a phosphate structure with a loose and plicated morphology,and can be used to improve the anticorrosion performance of silica sol coating.
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