Graphene　oxide/epoxy　composite　coatings　have　attracted　much　attention　from　researchers　due　to　their　excellent　anti-corrosion　properties.　Graphene　oxide　as　a　two-dimensional　nano-filler　can　enhance　the　overall　properties　of　epoxy　resin　coatings.　In　the　paper,　models　of　graphene　oxide/epoxy　composite　coatings　with　different　permeation　degrees　are　constructed　respectively.　The　interfacial　interaction　between　GO　and　epoxy　resin　and　the　adsorption　properties　of　epoxy　coating　with　metal　are　analyzed　from　an　atomic　perspective　by　molecular　dynamics　simulations.　The　results　indicate　that　the　interfacial　adsorption　effect　of　the　epoxy　coating　on　the　protected　metal　is　stronger　than　the　interfacial　bonding　of　GO　on　the　epoxy　resin　matrix.　Simulations　of　models　with　different　degrees　of　permeation　suggest　that　the　permeation　of　the　NaCl　solution　occupies　the　interfacial　space　and　reduces　the　adhesion　between　the　two　interfaces.　　©　2023　EDP　Sciences.　All　rights　reserved.