Abstract
Abstract Some aminoester organic compounds were tested as corrosion inhibitors for iron in molar hydrochloric acid (HCl) by mass-loss and electrochemical polarization methods. Both techniques gave the same order of inhibition. Comparison of results among those aminoesters showed L-methionine methyl ester (METOCH3) was the best inhibitor. Its inhibition efficiency (E%) reached a maximum value of 95% at 10/2 M. Polarization measurements indicated METOCH3 acted as a cathodic inhibitor without changing the mechanism of the hydrogen evolution reaction. METOCH3 was adsorbed on the iron surface according to a Frumkin isotherm model. The effect of temperature indicated that E% of METOCH3 increased with increasing temperature in the range of 20°C to 50°C.
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