The　corrosion　resistance　of　ultra-high　performance　concrete　(UHPC)　with　superabsorbent　polymers　(SAPs)　submerged　in　deionized　water,　chloride　saltwater,　and　compound　saltwater　was　studied.　The　investigated　mixtures　included　a　control　UHPC　mixture　and　UHPC　mixtures　with　0.3　%　sodium　polyacrylates　and　0.3　%　polyacrylate-co-acrylamide.　The　corrosion　performance　was　evaluated　using　electrochemical　impedance　spectroscopy,　while　scanning　electron　microscopy-energy　dispersive　X-ray　(SEM/EDX)　analysis　was　used　to　analyze　micro-morphology　changes　and　chemical　composition.　Polarization　analysis　revealed　that　the　control　specimens　exhibited　the　highest　resistance　to　chloride　and　sulfate　penetration,　resulting　in　negligible　corrosion　rates　after　240　days　(icorr　from　0.0013　to　0.0063　µA/cm2).　The　SAP-modified　specimens　also　showed　high　resistance,　with　an　initial　low　corrosion　rate　(icorr　of　0.101　µA/cm2)　that　decreased　to　negligible　levels　after　28　days　(icorr　from　0.047　to　0.088　µA/cm2).　SEM/EDX　results　revealed　that　SAPs　facilitate　the　formation　of　Friedel＇s　salt　and　Ettringite　crystals　in　chloride　and　compound　saltwater,　contributing　to　the　reduction　in　corrosion　resistance.　©　2024　Elsevier　B.V.