Bacterial iron reduction and biogenic mineral formation for the stabilisation of corroded iron objects

Kooli, Wafa M. (University of Neuchâtel, Switzerland) ; Comensoli, Lucrezia (University of Neuchâtel, Switzerland) ; Maillard, Julien (Ecole polytechnique fédérale de Lausanne (EPFL), Lausanne) ; Albini, Monica (University of Neuchâtel, Switzerland) ; Gelb, Arnaud (Ecole polytechnique fédérale de Lausanne (EPFL), Switerland) ; Junier, Pilar (University of Neuchâtel, Switzterland) ; Joseph, Edith (Haute Ecole Arc Conservation-Restauration, HES-SO University of Applied Sciences and arts Western Switzerland)

Exploiting bacterial metabolism for the stabilisation of corroded iron artefacts is a promising alternative to conventional conservation-restoration methods. Bacterial iron reduction coupled to biogenic mineral formation has been shown to promote the conversion of reactive into stable corrosion products that are integrated into the natural corrosion layer of the object. However, in order to stabilise iron corrosion, the formation of specific biogenic minerals is essential. In this study, we used the facultative anaerobe Shewanella loihica for the production of stable biogenic iron minerals under controlled chemical conditions. The biogenic formation of crystalline iron phosphates was observed after iron reduction in a solution containing Fe(III) citrate. When the same biological treatment was applied on corroded iron plates, a layer composed of iron phosphates and iron carbonates was formed. Surface and cross-section analyses demonstrated that these two stable corrosion products replaced 81% of the reactive corrosion layer after two weeks of treatment. Such results demonstrate the potential of a biological treatment in the development of a stabilisation method to preserve corroded iron objects.


Keywords:
Article Type:
scientifique
Faculty:
Design et Arts visuels
School:
HE-Arc CR
Institute:
Unité de recherche en Conservation-restauration de la Haute Ecole Arc - UR-ARC CR
Subject(s):
Conservation - Restauration
Date:
2018-01
Pagination:
11 p.
Published in:
Scientific reports
Numeration (vol. no.):
vol. 8, 2018, n° 764, pp.
DOI:
ISSN:
2045-2322
Appears in Collection:



 Record created 2019-05-08, last modified 2019-05-13

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