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

Abstract

Purpose

The 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/approach

The effect of various parameters on the behavior of these inhibitors has been studied using the weight loss and polarization measurements.

Findings

The 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/value

This 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.

Citation

Fouda, A.S., EL‐Sayyad, S.A. and Abdallah, M. (2011), "N‐3‐hydroxyl‐2‐naphthoyl hydrazone derivatives as inhibitors for corrosion of carbon steel in H₂SO₄ acid solution", Anti-Corrosion Methods and Materials, Vol. 58 No. 2, pp. 63-69. https://doi.org/10.1108/00035591111110705