IMIDAZOLE DERIVATIVES AS CORROSION-INHIBITORS FOR ZINC IN HYDROCHLORIC-ACID

The efficiency of various imidazole derivatives as zinc corrosion inhi bitors in hydrochloric acid (HCl) was investigated using electrochemic al and gravimetric methods. A difference in efficiency (z) was observe d with the introduction of different substituents into a imidazole ske leton. It was established that substituents which increased the electr on density at the reaction center improved the corrosion inhibiting pr operties of the heterocyclic compound. A linear correlation between re action kinetic data and the sum of the polar substituent constants was obtained.