Corrosion Inhibition of Mild Steel in Hydrochloric Acid Solution using Cationic Surfactant Olyel-amido Derivatives

The effect of three compounds of cationic surfactants of olyel-amido derivatives on the corrosion of carbon steel in 1.0 M HCl solution was studied using weight loss galvanostatic, polarization measurements and potentiodynamic anodic polarization techniques. The inhibition efficiency was found to increase with increasing concentration, number of polyethelene diamine unit and with decreasing the temperature. The inhibitive effect of these compounds was explained on the basis of adsorption on the metal surface. The adsorption process follows Freundlich adsorption isotherm. Some activated thermodynamic parameters were computed and discussed. The olyel-amido derivatives provide a good protection to steel against pitting corrosion by shifting the pitting potential in the noble direction