The behavior of pre-corrosion effect on the performance of imidazoline-based inhibitor in 3Â wt.% NaCl solution saturated with CO2

Inhibition efficiencies for freshly abraded and pre-corroded low alloy steels after 96 h immersion. Pre-corrosion has a detrimental effect on the inhibitor performance. In the presence of 1.2195 × 10−5 mol/l inhibitor, the inhibition efficiencies for low alloy steel pre-corroded for 2 h, 24 h and 48 h are 71.9%, 4.8% and 19.1%, respectively, while these values are increased to 96.4%, 81.5%, 84.8%, when the inhibitor concentration increases to 2.4390 × 10−5 mol/l.