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

Jordan Baux (1, 2) , Nicolas Caussé (1) , Jérôme Esvan (1) , Sophie Delaunay (2) , Jonathan Tireau (2) , Marion Roy (3) , Dominique You (3) , Nadine Pébère (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 EDF R&D MMC - Matériaux et Mécanique des Composants
3 SECR - Service d'Etudes du Comportement des Radionucléides

Octadecylamine (ODA) is a well-known organic inhibitor for the corrosion protection of carbon steels. In the present study, electrochemical impedance data analysis was performed to extract physical parameters of the ODA thin film that formed on a P275 carbon steel surface. First, surface observations and contact angle measurements showed the steel surface modification after the ODA treatment linked to the adsorption of an organic hydrophobic thin film. X-ray photoelectron spectroscopy confirmed the presence of a very thin organic layer and revealed the presence of iron oxide/hydroxide underlying the ODA film. The impedance data analysis with a power-law distribution of resistivity in the organic film allowed the permittivity and thickness to be extracted. Finally, from the impedance results with and without ODA, the instantaneous corrosion inhibition efficiency was determined.

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

Domaines: Matériaux; Matériaux

Jordan Baux, Nicolas Caussé, Jérôme Esvan, Sophie Delaunay, Jonathan Tireau, et al.. Impedance analysis of film-forming amines for the corrosion protection of a carbon steel. Electrochimica Acta, 2018, 283, pp.699-707. ⟨10.1016/j.electacta.2018.06.189⟩. ⟨hal-01883111v2⟩