Ecofriendly β-N-butyl amino propionic acid as green corrosion inhibitor for N80 steel in CO₂-saturated brine water

To mitigate CO₂ corrosion in the oil and gas industry, a green non-toxic β-N-butyl amino propionic acid (BAA) was synthesized using a low-energy and zero-waste one-pot method. The effectiveness of BAA as a corrosion inhibitor for N80 steel in CO₂-saturated brine water was investigated through experimental measurements and theoretical modeling. The results demonstrate that BAA functions as an effective mixed-type corrosion inhibitor. BAA molecules interact with F (1 1 0) with the–COO– and–NH₂⁺-moiety in the hydrophilic head group, and the hydrophobic groups are adsorbed on the steel surface in a configuration 45° away from the steel surface. The adsorption is a mixture of physical and chemical processes and is consistent with the Langmuir isothermal adsorption formula. When the concentration is greater than 50 ppm, a complete corrosion inhibitor film with high hydrophobicity can be adsorbed on the steel surface, which can effectively impede the diffusion of corrosive species from brine to the steel surface.