A Study of Some New Acidizing Inhibitors on Corrosion of N-80 Alloy in 15% Boiling Hydrochloric Acid

Three new organic inhibitors, namely, dicinnamylidene acetone (DCA), disalicylidene acetone (DSA), and divanillidene acetone (DVA), were synthesized in the laboratory and their inhibiting action was studied on corrosion of N-80 alloy in boiling hydrochloric acid (HCl) by the weight loss method. DSA exhibited the best performance, giving an inhibition efficiency of 98.7%. Potentiodynamic polarization studies revealed that all three organic compounds were mixed-type inhibitors. The adsorption of all three compounds on N-80 alloy followed Temkin’s adsorption isotherm. All three inhibitors exhibited synergistic effects with the addition of potassium iodide (KI). Effect of immersion time was also studied for 24 h.