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The present paper brings report on a newly observed effect of corrosion inhibition of 1-allyl- 1H- indole-2,3-dione (Ind1) against carbon steel corrosion, in hydrochloric acid using gravimetric and electrochemical measurements. Ind1 inhibited the corrosion of carbon steel in 1.0 M HCl solution and the inhibition efficiency increased with increasing concentration of this inhibitor but decreased with increasing temperature. Polarization measurements showed the mixed type behavior of this inhibitor. Changes in impedance parameters suggested the adsorption of Ind1 on the carbon steel surface, leading to the formation of protective films. The high inhibition efficiency was attributed to the blocking of active sites by adsorption of inhibitor molecules on the steel surface. It was shown that adsorption of 1- allyl- 1H-indole-2,3-dione (Ind1) on the steel surface is consistent with the Langmuir adsorption isotherm and the obtained standard free energy of adsorption (ΔG°ads) values indicate that the corrosion inhibition of the carbon steel in 1.0 M HCl is depends on chemisorption.
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Zarrok et al. (2012) studied this question.
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