title: Influence of hydrogen-oxidizing bacteria on the corrosion of low carbon steel: Local electrochemical investigations.
abstract: Low carbon steel has been considered a suitable material for component of the multi-barrier system employed on the geological disposal of high-level radioactive waste (HLW). A non negligible amount of dihydrogen (H2) is expected to be produced over the years within the geological repository due to the anoxic corrosion of metallic materials and also to the water radiolysis. The influence of the activity of hydrogen-oxidizing bacteria (HOB) and iron-reducing bacteria (IRB) on carbon steel corrosion is considered in this study because of the high availability of energetic nutriments (H2, iron oxides and hydroxides) produced in anoxic disposal conditions. Local electrochemical techniques were used for investigating the activity of IRB as a promoter of local corrosion in the presence of H2 as electron donor. A local consumption of H2 by the bacteria has been evidenced and impedance measurements indicate the formation of a thick layer of corrosion products.
authors.affiliation: CNRS, UPR15, Laboratoire Interfaces et Systèmes Electrochimiques, F-75005 Paris, France; UPMC Univ Paris 06, UPR15, LISE, 4 place Jussieu, F-75005 Paris, France.
authors.forename: Rebeca
authors.initials: R
authors.lastname: Moreira
authors.affiliation: CEA/DEN/DTN/SMTM/LMTE, 13108 Saint Paul lez Durance, France.
authors.forename: Marta K
authors.initials: MK
authors.lastname: Schütz
authors.affiliation: CEA/DEN/DTN/SMTM/LMTE, 13108 Saint Paul lez Durance, France.
authors.forename: Marie
authors.initials: M
authors.lastname: Libert
authors.affiliation: CNRS, UPR15, Laboratoire Interfaces et Systèmes Electrochimiques, F-75005 Paris, France; UPMC Univ Paris 06, UPR15, LISE, 4 place Jussieu, F-75005 Paris, France.
authors.forename: Bernard
authors.initials: B
authors.lastname: Tribollet
authors.affiliation: CNRS, UPR15, Laboratoire Interfaces et Systèmes Electrochimiques, F-75005 Paris, France; UPMC Univ Paris 06, UPR15, LISE, 4 place Jussieu, F-75005 Paris, France. Electronic address: vincent.vivier@upmc.fr.
authors.forename: Vincent
authors.initials: V
authors.lastname: Vivier
mesh_terms: D002244:Carbon / Q000737:chemistry*; D003343:Corrosion; D058266:Dielectric Spectroscopy / Q000295:instrumentation; D004867:Equipment Design; D006859:Hydrogen / Q000737:chemistry / Q000378:metabolism*; D008420:Manufactured Materials / Q000032:analysis / Q000382:microbiology*; D064347:Microscopy, Electrochemical, Scanning / Q000295:instrumentation; D010084:Oxidation-Reduction; D020592:Shewanella / Q000502:physiology*; D013232:Steel / Q000737:chemistry*
chemical_list: D013232:Steel; D002244:Carbon; D006859:Hydrogen
keywords: Biocorrosion; Carbon steel; Hydrogen-oxidizing bacteria (HOB); Local electrochemical impedance spectroscopy; SECM