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Open AccessArticle

Investigation of Biogenic Passivating Layers on Corroded Iron

1
Laboratory of Microbiology, Institute of Biology, University of Neuchâtel, 2000 Neuchâtel, Switzerland
2
Laboratory of Technologies for Heritage Materials, Institute of Chemistry, University of Neuchâtel, 2000 Neuchâtel, Switzerland
3
Laboratory for Environmental Biotechnology, ENAC-IIE-LBE, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
4
Laboratory of conservation research, Sammlungszentrum, Swiss national museum, Lindenmoosstrasse 1, 8910 Affoltern am Albis, Switzerland
5
Haute Ecole Arc Conservation-Restauration, HES-SO, 2000 Neuchâtel, Switzerland
*
Author to whom correspondence should be addressed.
Present address: Laboratory for Mechanical Systems Engineering, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland.
Present address: Institute for the study of Nanostructured Materials, Italian National council of Research (CNR-ISMN), 7-00185 Rome, Italy.
§
These authors contributed equally to this work.
Materials 2020, 13(5), 1176; https://doi.org/10.3390/ma13051176
Received: 12 February 2020 / Revised: 28 February 2020 / Accepted: 3 March 2020 / Published: 6 March 2020
(This article belongs to the Special Issue Corrosion and Protection of Materials)
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. View Full-Text
Keywords: iron corrosion; SEM; Raman spectroscopy; biogenic minerals; bacterial iron reduction; cultural heritage; conservation-restoration; corrosion stabilization iron corrosion; SEM; Raman spectroscopy; biogenic minerals; bacterial iron reduction; cultural heritage; conservation-restoration; corrosion stabilization
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MDPI and ACS Style

Comensoli, L.; Albini, M.; Kooli, W.; Maillard, J.; Lombardo, T.; Junier, P.; Joseph, E. Investigation of Biogenic Passivating Layers on Corroded Iron. Materials 2020, 13, 1176.

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