To　study　the　effects　of　ion　type　and　dosage　of　alkali　activators　on　the　carbonation　of　one-part　alkali-activated　nickel　slag　(OAANS)　mortar,　NaOH,　Na2SiO3,　NaOH+Na2SiO3,　KOH,　and　KOH+Na2CO3　were　used　as　activators.　The　carbonation　depth,　compressive　strength,　and　microstructure　(via　MIP,　XRD,　and　FTIR)　were　analyzed.　Results　show　that　OAANS　mortar　with　K+　as　the　cation　has　significantly　lower　carbonation　resistance　than　those　with　Na+.　Compressive　strength　with　K+　decreases　initially　after　carbonation,　then　increases,　while　strength　with　Na+　grows　rapidly　early　and　slows　later.　With　the　same　cation,　mortars　with　OH-　exhibit　higher　strength　than　those　with　SiO32-　after　28　days　of　carbonation.　Increasing　alkali　dosage　promotes　hydration,　reduces　porosity,　and　enhances　carbonation　resistance,　with　effects　depending　on　the　alkali　activator　type.