A novel antistatic anticorrosion composite coating was designed. The conductive core-shell straticulate structured silica@graphene and antimony doped tin oxide (ATO) were introduced in the waterborne epoxy coating to significantly decrease electrical resistivity. Reduced graphene oxide (RGO)-encapsulated functionalized silica hybrids (f-SiO2@RGO) were fabricated from sodium borohydride reduction of electrostatically assembled f-SiO2@GO hybrids with the help of silane coupling agent. The morphologies, the corrosion resistance and the antistatic properties were investigated. In the ATO + f-SiO2@RGO/epoxy coating, the f-SiO2@RGO sheets were evenly dispersed in coating, forming unique core-shell straticulate structure that effectively prevented the penetration of electrolyte, and constructed a conductive network at the coating-tinplate. The results showed that the antistatic and the anticorrosive performances of ATO + f-SiO2@RGO/epoxy coating were significantly enhanced as compared with the addition of 5% other fillers in coating, which includes the same amount of ATO. This superior core-shell f-SiO2@RGO straticulate structure and ATO particles, with their prominent conductivity, can make full use of the enhancement effect of different components and thus endow waterborne epoxy coatings with outstanding corrosion resistance and antistatic properties overall.

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Journal of Alloys and Compounds

Volume 745, 15 May 2018, Pages 705-715