Catalytic graphene‑mediated oxygen blocking and depletion for enhancing dual passive/active anticorrosion of epoxy coatings

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon letters / 32권 / 7호
ㆍ저자명 : Tong Yan, Meng Cheng, Junhao Liu, Shuangqing Sun, Songqing Hu

목차

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

영어 초록

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.

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