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

Abstract : 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.
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J. Baux, N. Causse, J. Esvan, S. Delaunay, J. Tireau, et al.. Impedance analysis of film-forming amines for the corrosion protection of a carbon steel. Electrochimica Acta, Elsevier, 2018, 283, pp.699-707. ⟨cea-02339747⟩

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