%0 Journal Article %T Electrochemical behavior of thick rust layers on steel artefact: Mechanism of corrosion inhibition %+ Institut Jean Lamour (IJL) %+ Laboratoire Archéomatériaux et Prévision de l'Altération (LAPA - UMR 3685) %+ IRAMAT - Laboratoire Métallurgies et Cultures (IRAMAT - LMC) %+ Centre de recherche et de restauration des musées de France (C2RMF) %A Rocca, Emmanuel %A Faiz, Hadri %A Dillmann, Philippe %A Neff, Delphine, D. %A Mirambet, François %< avec comité de lecture %@ 0013-4686 %J Electrochimica Acta %I Elsevier %V 316 %P 219-227 %8 2019-05-28 %D 2019 %R 10.1016/j.electacta.2019.05.107 %Z Chemical Sciences/Material chemistryJournal articles %X The electrochemical behavior of aged corrosion layers (CL) on artefact was studied, in corrosive reference water without and with non-toxic corrosion inhibitors such as decanoate ions and flavonoids compounds, constituting the condensed tannins, such as catechin. Electrochemical impedance spectroscopy measurements on the metal/CL system and voltammetric studies of FeOOH phases on carbon paste electrode show that the corrosion inhibition mechanism is mainly based on the blocking of the dissolution of FeOOH-type phase and the decrease of the diffusion of ionic species in the pores network of CL. Indeed, the formation of iron decanoate, revealed by X-ray diffraction and microscopic observation, inhibits the electrochemical activity of FeOOH-type phases and blocks the electrochemical dissolution of FeOOH into Fe2+ cations. On the other hand, the catechin compound modifies the surface of rust compounds into a blue-black compound, but this modification has a poor influence on the electrochemical activity of FeOOH-type compounds. %G English %2 https://cea.hal.science/cea-02401231/document %2 https://cea.hal.science/cea-02401231/file/S0013468619310400.pdf %L cea-02401231 %U https://cea.hal.science/cea-02401231 %~ CEA %~ CNRS %~ UNIV-BM %~ UNIV-ORLEANS %~ UNIV-BM-THESE %~ PUBNIMBE %~ DSV %~ UNIV-LORRAINE %~ INC-CNRS %~ IRAMIS-NIMBE %~ CEA-UPSAY %~ IJL-UL %~ UNIV-PARIS-SACLAY %~ CEA-UPSAY-SACLAY %~ CEA-DRF %~ UNIV-BORDEAUX-MONTAIGNE %~ PHD_CNRS %~ C2RMF %~ LMC-IRAMAT %~ TEST-HALCNRS %~ CEB-LMC %~ GS-ENGINEERING %~ IRAMIS %~ GS-CHIMIE %~ GS-HUMANITIES-HERITAGE %~ GS-PHYSIQUE %~ INSTITUT-SCIENCES-LUMIERE %~ ELSEVIER %~ TEST2-HALCNRS %~ IJL-206