Corrosion inhibition of mild steel in sodium chloride solution by Glutaric acid

Abstract

The corrosion inhibition of mid steel in an aqueous solution containing 60 ppm of Cl^- has been evaluated by weight loss method in the absence and presence of inhibitor namely glutaric acid. The formulation consisting of 250 ppm of glutaric acid offers good inhibition efficiency of 78 %. The electrochemical studies such as polarization study and impedance spectra have been recorded. Polarization study revelas that this formulation acts as an anodic inhibitor and controls the anodic reaction more preferably. AC impedance spectra signify that a protective film is formed over the mild steel surface. The corrosion parameters obtained from weight loss method, polarization studies and impedance spectra shows this inhibitor offers good corrosion inhibition efficiency and control the control the corrosion of mild steel. Fluorescence spectral analysis was used to detect the presence of iron-inhibitor complex in solution and protective film formed over the mild steel surface. The surface morphology has been analyzed by FTIR, UV-Visible spectroscopy Scanning Electron Microscope (SEM).