Preparation of Nitrogen and Phosphorus Co-doped Graphene Oxide and Corrosion Resistance of Waterborne Composite Coatings NPGO/Epoxy Resin
N and P co-doped graphene oxide(NPGO)was prepared by low temperature solution method with graphene oxide(GO)as raw material,phytic acid(PA)as P source,and aqueous ammonia solution(NH3·H2O)as N source,and then,N and P co-doped graphene/epoxy resin(NPGO/EP)water-borne composite coating was prepared by using waterbome epoxy resin(EP)as the film former.The structure and morphology of NPGO were characterized by FTIR,XPS,XRD,SEM and TEM.The corro-sion resistance of composite coatings was assessed by contact angle measurement,electrochemical measurement and salt spray test.The results show that NPGO/EP composite coating has better metal protection effect than pure EP coating,GO/EP composite coating,as well as single P doped graphene/ep-oxy resin(PGO/EP)composite coating and single N doped graphene/epoxy resin(NGO/EP)composite coating.NPGO/EP composite coating showing good corrosion resistance when the addition amount of NPGO is 1.5％(mass fraction):the electrochemical impedance reaches 4.85 × 108 Ω·cm2,and slight rust marks appear only after 480 h of salt spray test.
materials failure and protectioncorrosion resistancenitrogen-phosphorus graphenewaterborne epoxy resincomposite coating
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