Effect of the Unsaturation of the Hydrocarbon Chain of Fatty-Amides on the CO2 Corrosion of Carbon Steel Using EIS and Real-Time Corrosion Measurement. (2nd March 2015)

• Record Type: Journal Article
• Authors: Porcayo-Calderon, J.; Regla, I.; Vazquez-Velez, E.; Martinez de la Escalera, L. M.; Canto, J.; Casales-Diaz, M.
• Other Names: Cooke Stephen Academic Editor.
• Is Part Of: Journal of spectroscopy. Volume 2015(2015)
• Publication Date: 2015-03-02
• Subjects: Spectrum analysis -- Periodicals; 543.505
• DOI: 10.1155/2015/184140
• Languages: English
• ISSNs: 2314-4920

Abstract

Abstract : Fatty-amide derivatives were evaluated to study the effect of the double bonds into the hydrocarbon chain (C18) on the corrosion behavior of carbon steel. Electrochemical impedance spectroscopy (EIS) and real-time corrosion measurements were used to evaluate the inhibition mechanism of the fatty-amides on carbon steel in CO2 -saturated (3% NaCl + 10% diesel) emulsion at 50°C. EIS results demonstrated that the unsaturation present into the hydrocarbon chain contributes to the efficiency of fatty-amides, because they can be adsorbed on the metal surface by a flat-adsorption process reducing the presence of active sites and blocking the corrosion process and preventing the diffusion of corrosive species, such as H2 O, H +, Cl −, and HC O 3 - . Real-time corrosion measurements also indicated that the effectiveness of the inhibitors is dependent on the unsaturation into the hydrocarbon chain, being also a good technique to determine the stability of the adsorption process of the inhibitors.