Enhanced functional properties of CeO2 modified graphene/epoxy nanocomposite coating through interface engineering

SURFACE & COATINGS TECHNOLOGY

卷:409

Article

Qian, Ying¹  Zheng, Wei^1,3  Chen, Wenge¹  Feng, Tao¹  Liu, Terence Xiaoteng²  Fu, Yong Qing² 

[1] Xian Univ Technol, Sch Mat Sci & Engn, Xian 710048, Shaanxi, Peoples R China

[2] Northumbria Univ, Fac Engn & Environm, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England

[3] Xian Huichuang Res Inst Precious Met New Mat, Xian 71000, Shaanxi, Peoples R China

关键词: Epoxy resin;    Graphene;    Ceria;    Corrosion resistance;    Conductivity;   

DOI  :  10.1016/j.surfcoat.2020.126819

来源: Elsevier

【 摘 要 】

This paper reports significant enhancement of corrosion resistance and electrical properties of waterborne epoxy coatings through additions of ceria modified graphene. Results showed that ceria particles were uniformly distributed and covalently bonded onto the surface of graphene. A dense interface layer was formed between the ceria modified graphene and epoxy matrix by aliphatic ether bonds. The composite coating with a modified graphene content of 0.5 wt% exhibited the best corrosion resistance with the highest impedance modulus (e.g., 10(3) Omega cm(2) for the damaged coating) and the lowest corrosion rate (e.g., 0.002 mm/year). The excellent corrosion resistance of the composite coating is related to the barrier effect of graphene and the inhibition effect of ceria on metal corrosion. Moreover, the coating showed a low percolation threshold of 0.231 vol% and its electrical conductivity reached 10(-5) S/m when the content of modified graphene was 0.5 wt%.

【 授权许可】

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