[Introduction]Graphene(GE)was introduced as a modifier into a waterborne zinc-rich epoxy(ZRE)coating,and the effect of the dosage of graphene on the mechanical,electrical,and anticorrosion properties of the ZRE coatings with different zinc contents was discussed.[Method]The mechanical properties of the coatings were examined by cross-cut adhesion test and impact resistance test.The anticorrosion performance of the GE-modified waterborne ZRE coating was evaluated according to the surface resistivity,electrical resistivity,water absorption,and neutral salt spray corrosion resistance.[Result]With the increasing of zinc content,the introduction of a small amount of graphene greatly improved the conductivity and corrosion resistance of the ZRE coating,but too much addition of graphene led to poor performance of the ZRE coating.Based on the mechanical,electrical,and anticorrosion properties,the ZRE coating with 70%of zinc and 0.9%of graphene was the best.[Conclusion]The formation of more and more corrosion microcells caused by the increase of graphene addition is one of the key factors leading to the decline of anticorrosion performance of the ZRE coating.Clarifying the coexistence relationship between graphene,zinc,and iron in the coating is expected to further improve the comprehensive performance of waterborne epoxy zinc-rich coatings.
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