Abstract
Four sulfated fatty acid diethanolamine complex (DC) were synthesized based on four different types of vegetables oils and tested as corrosion inhibitors of mild steel in CO2-saturated 1% NaCl solution at 50 degrees C. Results obtained show that the surfactants studied are efficient corrosion inhibitors for mild steel. It is found that the inhibition efficiency increases with concentration, and the good inhibition efficiencies are reached near their critical micelle concentrations (99.95% at 100 ppm). The adsorption of inhibitor on the steel surface obeys the Langmuir adsorption isotherm equation and was chemisorption