In　this　study,　the　ferrocene　modified　polyaniline　[P(FcA-co-ANI)]　with　tunable　electrical　conductivity　was　pre-pared　by　introducing　ferrocene　groups　into　the　main　chain　of　polyaniline　(PANI)　with　a　hydrochloric　acid　dopant.　The　H-1　NMR,　SEM,　XRD　and　FT-IR　results　proved　the　successful　preparation　of　the　copolymers　P(FcA-co-ANI).　The　corrosion　resistance　of　the　coatings　on　Q215　steel　was　investigated　by　EIS.　The　results　showed　that　the　P(FcA-co-ANI)/EP　coatings　and　PANI/EP　coatings　all　improved　the　long-term　corrosion　resistance　by　more　than　2　orders　of　magnitude　with　comparison　of　EP　coatings.　Both　coatings　showed　excellent　corrosion　inhibition.　Furthermore,　the　|Z|0.01　Hz　values　of　the　P(FcA-co-ANI)/EP　coating　started　to　recover　in　a　shorter　period　of　time　and　returned　to　higher　values　compared　to　the　PANI/EP　coating,　and　did　not　drop　as　sharply　as　the　PANI/EP　coating　in　the　later　stages　of　immersion.　Besides,　the　results　of　Rc　and　Rct　values　also　show　that　the　P(FcA-co-ANI)/EP　coatings　provide　faster　and　better　corrosion　inhibition.　This　is　due　to　the　greater　conductivity　P(FcA-co-ANI)　being　more　sensitive　to　the　electrons　generated　by　metal　corrosion　and　so　generating　the　passivation　layer　faster.　The　impact　and　peel　tests　show　excellent　mechanical　properties　and　adhesion　of　the　coating.　This　work　offers　some　theoretical　help　for　understanding　the　anticorrosion　mechanism　of　PANI.