Nano　coatings　for　anti−corrosion　and　electromagnetic　wave　absorbing　can　simultaneously　implement　the　functions　of　assimilating　electromagnetic　waves　and　reducing　the　corrosion　of　materials　caused　by　corrosive　environments,　such　as　seawater.　In　this　work,　a　composite　material　for　both　electromagnetic　wave　absorption　and　anti−corrosion　was　prepared　by　an　in−situ　chemical　oxidation　and　surface　coating　method　using　carbonyl　iron　powder　(CIP),　graphene　oxide　(GO)　and　aniline　(AN).　The　synthesized　composite　material　was　characterized　by　scanning　electron　microscopy　(SEM),　infrared　spectroscopy　(FT−IR)　and　XRD.　The　carbonyl　iron　powder−graphene　oxide−polyaniline　(CIP−GO−PANI)　composite　material　was　used　as　the　functional　filler,　and　the　epoxy　resin　was　the　matrix　body　for　preparing　the　anticorrosive　wave−absorbing　coating.　The　results　show　that　CIP　had　strong　wave−absorbing　properties,　and　the　anti−corrosion　property　was　greatly　enhanced　after　being　coated　by　GO−PANI.　©　2022　by　the　authors.　Licensee　MDPI,　Basel,　Switzerland.