Imidazoline and its precursor, amide, are very effective inhibitor
intermediates and are widely used in formulating the corrosion products for application in the oil and gas industries. Their high temperature
corrosion inhibition performance was evaluated and compared. Our results show that imidazoline and amide offer poor to moderate high temperature/pressure (300 °F/3,000 psig) inhibition performance, respectively, with amide giving a better thermos stability. Yet, both give
excellent, comparable inhibition performance at a moderate temperature of 150 °F. These chemistries can provide up to 90% effectiveness at the high temperature, if the inhibitor concentration is very high. Keywords: Corrosion Inhibitor, Inhibition, Imidazoline, Amide, High Temperature/Pressure, Performance Evaluation.