To　reveal　the　evolution　law　of　the　pitting　of　carbon　steel　in　the　atmospheric　environment,a　numerical　model　of　pitting　was　established　on　the　basis　of　the　electrochemical　corrosion　mechanism.　Meanwhile,it　is　also　coupled　with　tertiary　current　distribution,material　transfer　and　deformation　geometry　multiphysics　fields.　Based　on　the　validated　numerical　model,an　analysis　was　conducted　by　the　effects　of　pH,NaCl　concentration　and　relative　humidity　(RH)on　the　pitting　rate.　Furthermore,the　prediction　model　of　pitting　rate　was　established.　The　results　show　that　the　pitting　shape　changes　from　conical　to　hemispherical　and　ultimately　develops　into　a　cylindrical　shape.　When　the　pH　value　is　in　the　range　of　6.0　to　7.0,the　pitting　rate　remarkably　decreases,with　the　maximum　reduction　being　23.96%.　When　the　NaCl　concentration　falls　within　the　range　of　0.5%　to　1%　(mass　fraction),an　increase　in　NaCl　concentration　significantly　impacts　the　pitting　rate,with　a　maximum　increment　of　10%.　When　the　RH　ranges　from　72%　to　77%,the　pitting　rate　of　carbon　steel　exhibits　an　exceptionally　high　level.　The　error　between　the　predicted　pitting　rate　and　the　test　is　less　than　5%.　These　indicate　that　the　numerical　model　and　prediction　formula　established　in　this　work　are　applicable　to　predicting　the　pitting　evolution　process　and　pitting　rate　of　carbon　steel.　©　2024　Cailiao　Daobaoshe/　Materials　Review.　All　rights　reserved.