Doping graphene to epoxy resins can improve the protective ability of the coating, but the lack of active anticorrosion function greatly limits its application in the field of anticorrosion. Herein, N/S-rich few-layer-graphene (N/S-FLG) was prepared and adopted to endow epoxy coating with dual passive/active corrosion protection. The obtained amphiphilic N/S-FLG is highly dispersed in the epoxy coating, giving rise to the enhanced hosting effect for graphene defects, avoiding the interface corrosion and blocking the penetration of corrosive species. Furthermore, the doping of N and S endows graphene sheets favourable catalytic ability for corrosive oxygen, actively eliminating its contribution to metal corrosion. Under this dual effect, the passive and active anticorrosion properties of epoxy coating are simultaneously enhanced. The coating with 1 wt% N/S-FLG reduces the corrosion rate of metal to 6.5 × 10– 5 mm/a, exhibiting almost no corrosion. The proposed concept of introducing nanocatalytic N/S-FLG is facile and eco-friendly, and will undoubtedly promote the practical application of anticorrosion coatings.

     Abstract
    1 Introduction
    2 Materials and methods
        2.1 Materials
        2.2 Synthesis of NS-rich few-layer-graphene
        2.3 Preparation of nanocomposite coating
        2.4 Coatings performance study
        2.5 Characterization
    3 Results and discussion
        3.1 Characterization of NS-FLG
        3.2 Physical properties of the composite coating
        3.3 Anticorrosion performance of coatings
    4 Conclusions
    Acknowledgements 
    References

• Tong Yan(College of Science, China University of Petroleum)
• Meng Cheng(School of Materials Science and Engineering, China University of Petroleum)
• Junhao Liu(School of Materials Science and Engineering, China University of Petroleum)
• Shuangqing Sun(School of Materials Science and Engineering, China University of Petroleum, Institute of Advanced Materials, China University of Petroleum)
• Songqing Hu(School of Materials Science and Engineering, China University of Petroleum, Institute of Advanced Materials, China University of Petroleum)