During CO2 capture, the corrosion of equipment materials is the key factors affecting the economic benefits and safety of CO2 capture. This study examined the corrosion behaviours and mechanisms of A106 steel in both a single diethylenetriamine (DETA) system and blended 2-amino-2-methyl-1-propanol (AMP)-DETA amine systems under simulated post-combustion CO2/O2 flue gas conditions. The time-dependent corrosion behaviour of AMP-DETA blends was systematically evaluated, enabling comparison with observations from single-amine solutions. The results showed that the corrosion rate of A106 steel was always higher than 3.6 mm/y in 3.0 mol/L DETA solution. With the addition of AMP, the corrosion rate decreased obviously. Compared with 3.0 mol/L DETA solution, the corrosion rate in 2.5 mol/L AMP + 0.5 mol/L DETA solution was about 0.42 mm/y at 360 h, corresponding to an approximate 88% reduction. X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy analyses identified Fe2O3 and Fe3O4 as the main corrosion products, along with adsorbed short-chain amines. This study suggests that AMP-DETA blends may produce a synergistic inhibitory effect on A106 steel corrosion, with AMP addition promoting the formation of protective mixed organic-inorganic surface films. These observations provide mechanistic insights for solvent formulation and material selection in CO2 capture processes.
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