Electrochemical study of inhibitory effect of new oxazol compound on stainless steel corrosion in acidic solution

Abstract

Influence of 2,3 dihydro-2-imino-3-p-tolylbenzo[d]oxazol-5-ol as a inhibitor on the corrosion of stainless steel 316L (SS) in HCl solution was investigated by means of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results of the investigation show that this compound has excellent inhibiting properties for SS corrosion in sulfuric acid. Inhibition efficiency increases with increase in the concentration of the inhibitor. The adsorption of inhibitor onto the SS surface followed the Langmuir adsorption model with the free energy of adsorption ΔG0ads of -7.25 kJ mol-1. Quantum chemical calculations were employed to give further insight into the mechanism of inhibition action of new organic inhibitor.

Keywords

• organic inhibitor
• adsorption
• stainless steel
• impedance
• density functional theory