Metals　used　in　the　electronics,　machinery　manufacturing,　and　construction　industry　are　often　chemically　reactive　and　corrosion-prone,　while　barriers　on　a　metal　as　a　conventional　method　for　anticorrosion　always　have　negative　effects　including　a　toxic　nature,　thickness　increase　over　time,　and　changes　of　electrical　and　optical　properties　after　surface　coating.　This　study　employs　a　benzene　solution　to　induce　a　rapid　formation　of　a　polycrystalline　graphene　film　on　copper　foils　or　iron　sheet　substrates　under　atmospheric　conditions　by　electromagnetic　induction,　which　is　non-toxic　and　environment-friendly　and　produces　favorable　anticorrosive　effects.　The　microscopic　analysis　shows　that　the　as-grown　film　is　a　polycrystalline　graphene　complex　of　graphene　crystallites.　It　is　revealed　that　the　copper　foils　or　iron　sheets　with　the　graphene　film　is　significantly　resistant　to　strong　corrosion,　with　the　corrosion　current　density　is　one　order　of　magnitude　lower　when　compared　with　samples　without　the　graphene　films.　The　polycrystalline　structure　of　the　graphene　film　can　prevent　the　electronic　conduction　of　the　surface,　thereby　reducing　corrosion　and　local　over-corrosion　phenomena　when　metals　are　situated　in　a　long-term　exposure　to　corrosive　environments.　©　2021　Wiley-VCH　GmbH