%0 Journal Article %T A study by electrochemical impedance spectroscopy and surface analysis of corrosion product layers formed during CO2 corrosion of low alloy steel %+ IFP Energies nouvelles (IFPEN) %+ Matériaux, ingénierie et science [Villeurbanne] (MATEIS) %+ ACXCOR %+ Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA) %A de Motte, Rehan %A Basilico, Edoardo %A Mingant, Rémy %A Kittel, Jean %A Ropital, Francois %A Combrade, Pierre %A Necib, Sophia %A Deydier, Valérie %A Crusset, Didier %A Marcelin, Sabrina %< avec comité de lecture %@ 0010-938X %J Corrosion Science %I Elsevier %V 172 %P 108666 %8 2020-08-01 %D 2020 %R 10.1016/j.corsci.2020.108666 %K carbon steel %K electrochemical impedance spectroscopy analysis %K CO2 corrosion %K iron carbonate %K magnetite %K pseudo-passivation %Z Chemical Sciences/Material chemistryJournal articles %X In the following research, electrochemical and surface analysis techniques are used to define the main contributing factor to the protectiveness offered by a scale formed at high temperature and pH under CO 2 saturated conditions. At 80°C and pH 6.6, trace amounts of a magnetite (Fe 3 O 4) phase was identified at certain locations beneath a more dominant iron carbonate (FeCO 3) film. Furthermore, over time, the evolution of the corrosion product layer towards a very low porosity results in a "diffusion barrier" that is indicated by a positive shift in the open circuit potential and is considered key to corrosion protection. %G English %L hal-02864432 %U https://ifp.hal.science/hal-02864432 %~ IFP %~ CNRS %~ UNIV-LYON1 %~ INSA-LYON %~ ANDRA %~ MATEIS %~ MATEIS_CORRIS %~ INSA-GROUPE %~ UDL %~ UNIV-LYON