Corrosion behaviour of mild steel in the presence of Schiff bases derived from 2-acetyl pyridine in 0.5M H2SO4

Abstract

Two heterocyclic Schiff bases namely (E)-2-(1-(2-phenylhydrazono)ethyl)pyridine (or 2- acetyl pyridine phenyl hydrazone) (2APPH) and (E)-2-(1-triazylidineethyl)pyridine (or 2- acetyl pyridine semicarbazone) (2APSC) were synthesized, characterized and their corrosion inhibition behaviour as well as mechanism of inhibition were investigated by different techniques. Structural characterization includes NMR, Mass, IR and UV-visible spectroscopy and elemental analysis. Corrosion inhibition behaviour of aforesaid compounds on mild steel in 0.5M sulphuric acid was examined by electrochemical methods including potentiodynamic polarization analysis, electrochemical impedance spectroscopy and noise studies. The mechanism of corrosion inhibition was explored and supplemented by adsorption and surface morphological studies.