Effect of acetamide derivative and its MN-complex as corrosion inhibitor for mild steel in sulphuric acid

Abstract

HYDRAZONE ligand N-(4-(2-hydrazinyl-2-oxoethoxy) phenyl)- acetamide [HL] and its metal complex of manganese (II) [Mn-HL] were investigated as corrosion inhibitors for mild steel in diluted sulphuric acid solution at 25 ± 1°C using three electrochemical methods which show matching results. they are potentiodynamic polarization, cyclic voltammetry & electrochemical impedance spectroscopy techniques. The experimental results clarify the inhibitive effect of N-(4-(2-hydrazinyl-2-oxoethoxy) phenyl) acetamide [HL] and its Mn (II) complex on mild steel; that increase in presence of the complex [Mn-HL] more than [HL] where The ligand displayed low efficiencies as corrosion inhibitor against localized corrosion while complex gives more corrosion inhibition efficiency. Detailed study effect of 0.1M sulphuic acid with and without ligand and its complex ligand MnCl2 on mild steel shown by surface morphology of specimen using scanning electron microscope (SEM) and energy dispersive X-ray (EDX) analysis that show improvement appears in surface morphology of mild steel with complex of ligand from localized attack to general attack (homogeneous surface and protective film).