The　work　aims　to　clarify　the　influence　of　stray　alternating　current　(AC)　on　the　corrosion　under　the　anticorrosive　coating　caused　by　peeling　and　damage　of　buried　steel　pipeline　corrosion　coating　and　the　mechanism　of　action　leading　to　peeling　of　coating.　COMSOL　Multiphysics®　simulations,　AC　impedance　spectroscopy　analysis　and　three-dimensional　microscope　were　used　to　study　the　corrosion　mechanism　and　stripping　behavior　of　X70　high-strength　pipeline　steel　at　3PE　coating　stripping　under　AC　stray　current　in　Golmud　soil　simulation　solution.　The　protective　performance　of　the　coating　was　significantly　reduced　due　to　the　presence　of　damage　points　and　stripping　areas　in　the　coating.　The　stray　current　was　unevenly　distributed　on　the　surface　ofX70　steel　in　the　initial　reserved　stripping　area,　and　the　current　density　at　the　breakage　point　was　significantly　higher　than　that　at　the　edge　of　the　stripping　area.　The　corrosion　reaction　caused　by　stray　currents　was　mainly　concentrated　at　the　damage　point　of　the　coating,　while　the　X70　steel　under　the　reserved　peeling　zone　showed　crevice　corrosion　phenomenon.　Corrosion　pit　depth　at　the　damage　point　of　the　coating　gradually　became　deeper　as　the　current　density　increased,　but　when　the　AC　current　density　increased　from　0　A/m2　to　100　A/m2,　the　peeling　area　of　the　anti-corrosion　coating　increased　significantly.　After　that,　when　the　current　density　continued　to　increase,　the　peeling　area　remained　basically　unchanged.　When　the　applied　alternating　current　density　was　the　same,　the　peeling　area　of　the　anti-corrosion　layer　increased　as　the　peeling　area　of　the　reserved　anti-corrosion　layer　decreased,　and　the　maximum　corrosion　pit　on　the　X70　steel　sample　slightly　deepened.　There　is　a　critical　current　density　in　the　delamination　area　of　coatings　caused　by　AC　stray　currents　and　such　density　can　result　in　and　keep　maximum　stripping　area.　When　the　initial　stripping　area　of　coating　is　smaller,　corrosion　and　coating　stripping　of　X70　steel　caused　by　AC　stray　current　are　more　serious.　©　2018,　Chongqing　Wujiu　Periodicals　Press.　All　rights　reserved.