Synthesis, Characterization and Corrosion Protective Efficiency of 2[2-Oxo-phenyl hydrazinyl ethyl] benzamide on Mild Steel in Sulphuric Acid Medium

Rinki Goel,Bahar Ahmed,Weqar A Siddiqi,V M Chaubey

doi:10.1155/2010/402878

Abstract

2[2-Oxo-phenyl hydrazinyl ether] benzamide (2BA) was synthesized, characterized and tested effective for corrosion inhibition of mild steel in 1 N H2SO4solution using galvanodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Polarization resistances calculated from the EIS measurements are in good agreement with those obtained from alternating current (AC) polarization measurements. The mild steel samples were also analyzed by Scanning Electron Microscopy (SEM). The result showed that 2BA is an excellent inhibitor for mild steel in acid medium. The inhibition was assumed to occurviaadsorption of the inhibitor molecule on the metal surface. In the 303-323K temperature range, the 2BA adsorption follows Langmuir isotherm model. The protection efficiency increases with increasing the inhibitor concentration in the range of 250-1000 ppm but slightly decreases with increasing temperature.

Highlights

It is generally assumed that corrosion inhibition performed by chemical compound added to the electrolyte is to be attributed almost as a first stage, to the adsorption of the additives to the metal/solution interface
The inhibitor adsorption may determine a structural change of the double layer, it reduces the rate of the electrochemical partial reaction, the anodic metal dissolution and the cathodic hydrogen ions reduction
The theoretical consideration of a correlation between the molecules structure of organic compounds and their ability to adsorb on the metal surface and to inhibit the corrosion process is aimed at in a series of the studies[1,2,3]

Summary

Introduction

It is generally assumed that corrosion inhibition performed by chemical compound added to the electrolyte is to be attributed almost as a first stage, to the adsorption of the additives (ions or neutral polar molecules) to the metal/solution interface. The aim of this work is to investigate the role played by newly synthesized 2[2-oxo-2phenyl hydrazinyl ethyl] benzamide on the corrosion behavior on mild steel in 1 N H2SO4.

Objectives

Results

Conclusion