Understanding the corrosion of CO2-loaded 2-amino-2-methyl-1-propanol solutions assisted by thermodynamic modeling

•Corrosivity of AMP is investigated with SEM, XRD, FIB and thermodynamic modeling.•Liquid phase speciation was determined by employing an electrolyte-NRTL model.•HCO3− concentration plays an important role in the formation of protective FeCO3.•FeCO3 is metastable in amine solution with dissolved O2 and passivation occurs.•Lower corrosion occurs in AMP than in MEA due to faster FeCO3 & Fe3O4 formation.