Conversion of steel by polyphenolic model molecules: Corrosion inhibition mechanism by rutin, esculin, esculetol

Delphine Veys-Renaux (1) , Solenn Reguer (2) , Ludovic Bellot-Gurlet (3) , François Mirambet (4) , Emmanuel Rocca (1)

1 IJL - Institut Jean Lamour
2 Synchrotron Soleil, DiffAbs beamline, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
3 MONARIS - De la Molécule aux Nanos-objets : Réactivité, Interactions et Spectroscopies
4 C2RMF - Centre de recherche et de restauration des musées de France

This paper focuses on the potential corrosion protection of steel in presence of three polyphenolic model molecules (rutin, esculin, esculetol) in a weak acidic medium (pH = 4). From an electrochemical point of view, the cathodic inhibition was attributed to the oxygen scavenger role of the considered antioxidant compounds. SEM observations, Raman spectroscopy and Synchrotron X-ray absorption spectroscopy revealed furthermore the formation of a surface film by precipitation of iron polyphenolate conversion products, in which iron III is likely coordinated with free-catechol groups. Glycosylated catechol groups are rather adsorbed on a FeOOH layer.

Mots clés: XAS; XANES; EXAFS; Polarization; Passive films; Raman spectroscopy; Corrosion; Steel; Synchrotron

Domaines: Chimie analytique; Matériaux; Matériaux

Delphine Veys-Renaux, Solenn Reguer, Ludovic Bellot-Gurlet, François Mirambet, Emmanuel Rocca. Conversion of steel by polyphenolic model molecules: Corrosion inhibition mechanism by rutin, esculin, esculetol. Corrosion Science, 2018, 136, pp.1 - 8. ⟨10.1016/j.corsci.2018.02.015⟩. ⟨hal-01756156⟩