Anionic surfactants [namely, gasoil sulfonate (GOS), kerosene sulfonate (KES), heavy solvent sulfonate (HSS) and total gasoline sulfonate (TGS)] were obtained from Algerian petroleum fractions. Their inhibiting effect on aluminium corrosion in hydrochloric solution (1 M HCl) is studied, using weight loss measurements, electrochemical polarization, and electrochemical impedance spectroscopy methods. The results obtained from different techniques are in good agreement and show that surfactants act predominately as cathodic inhibitors. The inhibition efficiency increases with increasing inhibitor concentration and decreases in the order: GOS > KES > HSS > TGS. The adsorption process of GOS was also studied in the temperature range of 293–323 K and reveals that the inhibitor adsorption onto Al is a physisorption-type, spontaneous and exothermic.
Research on Chemical Intermediates – Springer Journals
Published: May 8, 2013
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