N‐3‐hydroxyl‐2‐naphthoyl hydrazone derivatives as inhibitors for corrosion of carbon steel in H2SO4 acid solution

Abstract

PurposeThe purpose of this paper is to investigate the inhibiting properties of four N‐3‐hydroxyl‐2‐naphthoyl hydrazone derivatives in 0.5 M H2SO4 solution and to study the mechanism of their action.Design/methodology/approachThe effect of various parameters on the behavior of these inhibitors has been studied using the weight loss and polarization measurements.FindingsThe inhibiting action of the investigated compounds depends primarily on their concentration and molecular size. The compounds act as mixed type inhibitors and function via adsorption on carbon steel surface, which follows Frumkin adsorption isotherm. The addition of KI, KBr and KSCN to N‐3‐hydroxyl‐2‐naphthoyl hydrazone derivatives had a synergistic effect in enhancing the efficiency of corrosion inhibition.Originality/valueThis paper provides useful information regarding inhibition effect of N‐3‐hydroxyl‐2‐naphthoyl hydrazone derivatives and clarifies the role of the molecular structure and substituents on the inhibition efficiency of these investigated compounds on the corrosion of carbon steel in acidic solutions.