Impedance Investigation of Corrosion Inhibition of Armco Iron by Thiourea (CROSBI ID 78861)
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Metikoš-Huković, Mirjana ; Babić, Ranko ; Grubač, Zoran ; Brinić, Slobodan
engleski
Impedance Investigation of Corrosion Inhibition of Armco Iron by Thiourea
The inhibitive action of thiourea on the corrosive behavior of ARMCO iron was investigated in deaerated 0.5 M H_2S0_4 solution, by means of electrochemical impedance spectroscopy. The inhibitor effectiveness increases with concentration, reaches a maximum (at about 1 mm) and then decreases. The adsorptive behavior of thiourea on the electrode surface up to its peak follows a Frumkin type isotherm with lateral repulsion, where the molecules are vertically adsorbed on the iron surface via the sulfur atom. Thiourea acts as a mixed inhibitor up to the critical concentration. It decreases the dissolution of iron and the hydrogen evolution reaction by blocking the electrode surface. The free energy of adsorption DELTA G_ad = -39 kJ mol^(-1) and the attraction constant a = -4.4.
impedance spectroscopy; adsorption; corrosion inhibition; iron; thiourea
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