AC　corrosion　of　the　X80　and　X100　steels　in　0.1　M　NaCl　solution　were　studied　by　the　AC　voltammetry　technique.　Corrosion　electrochemical　kinetics　and　solid/solution　interface　structure　changes　under　the　influence　of　AC　voltage　were　characterized.　Results　illustrate　that　corrosion　potential　of　the　two　steels　shift　negatively　with　the　increase　of　AC　amplitude　and　decrease　of　AC　frequency.　The　anodic　processes　are　under　charge-transfer　control　and　the　anodic　Tafel　slopes　increase　with　the　increase　of　AC　magnitude.　The　cathodic　processes　are　under　diffusion　control　at　low　AC　amplitudes,　while　they　become　increasingly　under　charge-transfer　control　with　higher　AC　amplitudes.　(C)　2014　Elsevier　Ltd.　All　rights　reserved.