The　intergranular　corrosion　and　phase　evolution　of　5083　aluminum　alloy　containing　Er　and　Zr　during　annealing　at　100-230　degrees　C　were　studied　using　mass　loss　tests　and　transmission　electron　microscopy.　The　mass　loss　curves　showed　that　when　annealing　temperature　changed　from　200　to　220　degrees　C,　the　alloy　was　subjected　to　a　transition　from　sensitized　state　to　stabilized　state,　corresponding　to　the　change　of　nucleation　position　of　beta　precipitates　from　grain　boundaries　to　triple　junctions.　Particularly,　when　the　annealing　temperature　was　at　210　degrees　C,　this　transition　could　also　happen　when　the　annealing　time　was　increased　from　0.5-10　h　to　15-24　h,　associated　with　the　change　in　the　shape　of　beta　precipitates.　The　classical　nucleation　analysis　with　the　consideration　of　Mg　segregation　showed　the　nudeation　rates　at　grain　boundary　and　triple　junction　were　10(13　)and　10(11　)m(-3)　s(-1)　at　sensitization　temperature　150　degrees　C,　but　10(9)　and　10(10)　m(-3)　s(-1)　at　stabilization　temperature　220　degrees　C,　suggesting　the　change　of　nucleation　site　with　increasing　temperature.　The　analysis　of　diffusion　flux　of　Mg　around　beta　precipitate　suggested　that　the　shape　change　of　beta　precipitates　from　elongate　to　spheroidal　at　210　degrees　C　was　attributed　to　the　dominant　interface　diffusion　over　the　grain　boundary　diffusion　with　the　increase　of　time.　(C)　2019　The　Authors.　Published　by　Elsevier　Ltd.