Abstract
The study of the corrosion of pure iron in physiological 9g/L NaCl medium was studied by electrochemical method under different hydrodynamic conditions. The hydrodynamic conditions were simulated by using a rotating disc electrode. The corrosion inhibition using amino acid, methionine, and some amino esters: methionine methyl ester and methionine ethyl ester, on the electrochemical behaviour of iron. The results showed that the criterion of Levich is proved. The limit current is function of the speed of rotation of the electrode of iron and process is a mixed type kinetic. On the electrochemical behaviour of iron is studied. The ethyl 2-amino-4-(methylthio) butanoate or methionine ethyl ester (MetOC(2)H(5)) is the best inhibitor of series and its effectiveness attains 80 % in 10(-2)M. The MetOC(2)H(5) acts on the iron surface according to the Frumkin model.