Inhibition behaviour of Schiff base compund on the corrosion of mild steel in hydrochloric acid solution.

Schiff base (N'-((1H-indol-3-yl) methylene) thiophene-2-carbohydrazide) (IMTC) and the starting material (indol-3-carboxyaldehyde) have been investigated as mild steel corrosion inhibitors in (0.2, 0.4, 0.6) M HCl media using electrochemical impedance spectroscopy (EIS), energy dispersion X-ray analysis (EDX), and scanning electron microscopy (SEM). It has been demonstrated that the inhibition efficacy increases with increasing inhibitor concentration. A charge transfer technique is primarily responsible for controlling the mild steel's corrosion. Excellent results for the inhibitor were attributed to the creation of protective adsorption layers on the steel surface. Quantum chemical calculations have been utilized to clarify the inhibition mechanism. [ABSTRACT FROM AUTHOR]