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

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.