Investigation of biogenic passivating layers on corroded iron

Comensoli, Lucrezia (University of Neuchâtel, Switzerland) ; Albini, Monica (University of Neuchâtel, Switzerland) ; Kooli, Wafa (University of Neuchâtel, Switzerland) ; Maillard, Julien (Ecole polytechnique fédérale de Lausanne, Switzerland) ; Lombardo, Tiziana (Musée national suisse, Affoltern am Albis, Switzerland) ; Pilar, Junier (University of Neuchâtel, Switzerland) ; Joseph, Edith (Haute Ecole Arc Conservation-Restauration, HES-SO University of Applied Sciences and arts Western Switzerland)

This study evaluates mechanisms of biogenic mineral formation induced by bacterial iron reduction for the stabilization of corroded iron. As an example, the Desulfitobacterium hafniense strain TCE1 was employed to treat corroded coupons presenting urban natural atmospheric corrosion, and spectroscopic investigations were performed on the samples’ cross-sections to evaluate the corrosion stratigraphy. The treated samples presented a protective continuous layer of iron phosphates (vivianite Fe2+3(PO4)2·8H2O and barbosalite Fe2+Fe3+2(PO4)2(OH)2), which covered 92% of the surface and was associated with a decrease in the thickness of the original corrosion layer. The results allow us to better understand the conversion of reactive corrosion products into stable biogenic minerals, as well as to identify important criteria for the design of a green alternative treatment for the stabilization of corroded iron.


Keywords:
Article Type:
scientifique
Faculty:
Design et Arts visuels
Branch:
Conservation
School:
HE-Arc CR
Institute:
Unité de recherche en Conservation-restauration de la Haute Ecole Arc - UR-ARC CR
Subject(s):
Conservation - Restauration
Date:
2020-03
Pagination:
13
Published in:
Minerals
Numeration (vol. no.):
2020,13,1176
DOI:
ISSN:
1996-1944
External resources:
Appears in Collection:



 Record created 2021-03-10, last modified 2021-03-10

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