Chen Zhonghua1，Li Qing1，He Chang2 （1. School of Material Science and engineering，South China University of Technology，Guangzhou 510640， China；2. Guangzhou Jointas Chemical Co.，Ltd.，Guangzhou 510663，China）
Abstract：Three graphene oxides with different degrees of oxidation were prepared，which were used to modify the epoxy zinc-based coatings. The properties of the modified coatings were studied by salt spray test，electrochemical test，impact resistance and adhesion test. The results showed that the graphene oxide modified epoxy zinc-based coatings with lower oxidation degree provided the best performance. The effects of the content of graphene oxideand zinc powder on the corrosion resistance and mechanical properties of the coatings were investigated.
The results showed that the addition of graphene oxide could effectively delay the corrosion of steel，when the amount of GO-1 added was 0.36% and the content of zinc powder was 44%， the overall performance of the prepared GO-1/waterborne epoxy zinc-based coating was the best. When the graphene oxide is less oxidized，the less of oxygen-containing groups，and the carboxyl group was not existed，the corrosion resistance of the coating was improved.