Impedance analysis of film-forming amines for the corrosion protection of a carbon steel

Jordan Baux (1) , Nicolas Causse (1) , Jérôme Esvan (1) , S. Delaunay (2) , J. Tireau (2) , M. Roy (3) , D. You (3) , Nadine Pebere (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 EDF R&D - EDF R&D
3 CEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire)

Octadecylamine (ODA) is a well-known organic inhibitor for the corrosion protection of carbon steels. Inthe present study, electrochemical impedance data analysis was performed to extract physical param-eters of the ODA thin film that formed on a P275 carbon steel surface. First, surface observations andcontact angle measurements showed the steel surface modification after the ODA treatment linked to theadsorption of an organic hydrophobic thin film. X-ray photoelectron spectroscopy confirmed the pres-ence of a very thin organic layer and revealed the presence of iron oxide-hydroxide underlying the ODAfilm. The impedance data analysis with a power-law distribution of resistivity in the organic film allowedthe permittivity and thickness to be extracted. Finally, from the impedance results with and withoutODA, the instantaneous corrosion inhibition efficiency was determined.

Mots clés: Inhibitive efficiency; X-ray photoelectron spectroscopy; Resistivity distribution; Electrochemical impedance spectroscopy; Organic inhibitor

Domaines: Physique Nucléaire Expérimentale [nucl-ex]; Physique Nucléaire Théorique [nucl-th]

Jordan Baux, Nicolas Causse, Jérôme Esvan, S. Delaunay, J. Tireau, et al.. Impedance analysis of film-forming amines for the corrosion protection of a carbon steel. Electrochimica Acta, 2018, 283, pp.699-707. ⟨hal-01883111v1⟩