Inhibition Effect of Copper Complex of 1-(8-Hydroxy Quinolin-2-yl- Methyl) Thiourea on the Corrosion of Mild Steel in Sodium Chloride Solution

Abuthahir S.S Syed,Rajendran S,Nasser A Jamal Abdul

doi:10.2174/1874088x01408010071

Abstract

The Corrosion inhibition of an inhibitor namely Copper complex of 1-(8-hydroxy quinolin-2-yl-methyl) thiourea (Cu-HTF) which controls the corrosion of mild steel immersed in an aqueous solution containing 60 ppm Cl- has been investigated through electrochemical and mass loss method. The formulation consisting of 60 ppm of Cl- and 50 ppm of Cu-HTF offers good inhibition efficiency of 78 %. Polarization study shows that this formulation acts as a cathodic inhibitor.AC impedance spectra indicate that a protective film is formed on the mild steel surface. Fluorescence spectral analysis was used to detect the presence of iron-inhibitor complex. The surface morphology has been analyzed by FTIR, UV-Visible spectroscopy, Scanning Electron Microscope (SEM) and EDAX. Cu-HTF has the ability to prevent the growth of certain microorganisms such as E. coli, Streptococcus, Pseudomonas and Enterobacter.

Highlights

Mild steel is highly applicable and most widely used alloy of iron, comes in contact with chloride ions very frequently under numerous conditions and circumstances in industries
As the concentration of inhibitor increases, the inhibition efficiency decreases. This may be due to the fact that as the concentration of inhibitor increases, the protective film is formed on the mild steel surface goes into solution
Corrosion rates (CR) of mild steel immersed in an aqueous solution containing 60 ppm Cl- in the absence and presence of Cu-HTF inhibitor systems at various concentrations and the inhibition efficiency (IE %) obtained by mass loss method

Summary

Introduction

Mild steel is highly applicable and most widely used alloy of iron, comes in contact with chloride ions very frequently under numerous conditions and circumstances in industries. Chloride ions are known to be aggressive towards mild steel and cause severe corrosion problems. Various inorganic compounds have been reported as inhibitors for controlling corrosion of mild steel in water containing chloride ions [1]. Metal complexes are widely used as catalysts of chemical reactions, e.g. Oxidative dehydrogenation (ODH) of ethane and epoxidation of geraniol [4,5,6] and as stabilizers or precursors in sol-gel processes [7,8,9]. Palladium acetylacetonate is suggested as an effective corrosion inhibitor for water cooled nuclear reactor [11]. Interaction of transition metal complexes with mild steel is greatly affected by their standard electrode potentials, their reactivity and the nature of the ligand that could stabilize the metallic complexes. It should be noted that negative charged ligands like nitro, thiocyanate, Oxalato, glucinato and acetylacetonate could stabilize the

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