Oxathiadiazole Derivative as Corrosion Inhibitor for Mild Steel in Hydrochloric Acid

Abstract

Iraq as an oil country, many researchers are trying to find cheap, easy to manufacture corrosion inhibitors that derived from organic compounds. In the present study, a new Shiff base derived from oxathiadiazole namely 5-(4-((4-nitrobenzylidene) amino) phenyl) -1, 3, 4-oxadiazole-2-thiol (NPOT) is utilized as an efficient and an inexpensive corrosion inhibitor for mild steel in hydrochloric acid solution. The study is carried out in 1.0 M HCl environment utilizing potentiodynamic polarization techniques and scanning electron microscopy. The maximum inhibition efficiency was found to be 99% at all tested concentrations. SEM analysis confirming the inhibitive behavior of the NPOT versus the mild steel corrosion in corrosive environment. Quantum chemical calculations (DFT) utilized to estimate significant electronic parameters of the NPOT molecule so as to realize correlation between the NPOT chemical structure and inhibition properties.