The Effect of Non-ionic Surfactant on the Corrosion Inhibition of X52 Pipeline Steel in NaCl solutions

Non-ionic NPE-4 surfactant was evaluated in X52 steel/2.453 wt% NaCl interface using electrochemical impedance spectroscopy (EIS) and polarization curves. The application of negative potential on steel surface and hydrodynamic condition were considered in order to study the adsorption process. Surfactant tested as corrosion inhibitor after electrochemical techniques displayed low corrosion rate values. Standard free energy indicated that the cathodic charge helped to adsorb physically the molecule on the metal surface. Thus, the molecule cathodically active was able to remove the corrosive species and blocked the active sites from metallic surface.