Inhibition on Carbon Steel Corrosion in Presence ofHydrocarbon

In this work the study of electrochemical behaviour of organic compounds as corrosion inhibitors isbeing done over a carbon steel AISI 1018 immersed in a corrosive synthetic environment (brine typeNACE 1D196), in the absence and presence of hydrocarbon. The techniques used were theelectrochemical Polarisation curves and electrochemical impedance spectroscopy. In the Polarisationcurves, the presence of corrosion inhibitors in the system shows that increasing of theconcentration affects both the anodic and the cathodic stages of the corrosion process, showing that theobtained currents are lower by increasing the concentration of the inhibitor. On the other hand theinhibitor efficiency decreases with the presence of hydrocarbon in different systems. Electrochemicalimpedance spectroscopy shows that steel has high activity in the environments studied, being moreremarkable at low frequencies and in the presence of hydrocarbon since the spectra shows flattened semicircles, with low values of real impedance and inductive trends. This establishes that the interaction of ions in the solution with the metal, where adsorptionprocesses are governing the corrosion mechanism, is favoured by the presence of hydrocarbon