Inhibition Performance of Novel Dissymmetric Bisquaternary Ammonium Salt with an Imidazoline Ring and an Ester Group

Abstract In this paper, the inhibition performance of a novel dissymmetric bis‐quaternary ammonium salt with an imidazoline ring and an ester group (DBAS) for Q235 steel in 2 % NaCl solution saturated with CO 2 was investigated using weight loss, the polarization curve, electrochemical impedance spectroscopy methods and the quantum chemistry calculation. The results show that DBAS, which is good for the environment and have many activated centers and low E LUMO , has a high inhibition performance for Q235 steel in 2 % NaCl solution saturated with CO 2 . The inhibition efficiency of the studied corrosion inhibitor increased with increasing inhibitor concentrations. The inhibitor is a mixed‐type inhibitor which inhibits both anodic and cathodic reactions.