The effect of methionine ethyl ester (MetOC2H5), a non-toxic compound on the corrosion
of iron in citric-chloride solution at pH = 5, has been investigated by various corrosion
monitoring techniques. Results obtained reveal that this compound is a very good inhibitor.
Potentiodynamic polarization studies show that MetOC2H5 is a mixed-type inhibitor
and that it acts on the cathodic reaction without changing the mechanism of hydrogen
evolution. Variation in impedance parameters (Rt and Cdl) are indicative
of adsorption of MetOC2H5 on the metal surface. The adsorption of this product on the
iron surface obeys a Temkin adsorption isotherm. The effect of temperature indicates
that inhibition efficiency of MetOC2H5 slightly changes with increasing temperature
in the range of 30-60 °C.