The inhibitive action of iron(III), imidazole and mixture of them on the corrosion of carbon steel in 0.5M H2SO4 solution was investigated using galvanostatic, potentiodynamic anodic polarization andweight loss techniques. It was found that the percentage inhibition efficiency was found to increasewith increasing concentration of each compound.However,the combination of iron(III)with theimidazole increases the values of inhibition efficiency compared with individual copmpound. It wasfound that iron(III), imidazole and mixtures of them inhibit the pitting corrosion of carbon steel inchloride containing solutions by shifting the pitting potential into more positive direction . Theinhibiting solutions were analyzed using UV-Visible spectrophotometric before and after polarizationmeasurements. The inhibition was explained on the basis of a complex formation between the twocomponents, which was much more effective than the inhibiting action of each additive separately. Theinhibition mechanism was discussed depending on the results derived from corrosion and UV-visiblespectrophotometric measurements as well as conductometric investigations.
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