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Materials 2017, 10(6), 670; doi:10.3390/ma10060670

New Insights in the Long-Term Atmospheric Corrosion Mechanisms of Low Alloy Steel Reinforcements of Cultural Heritage Buildings

1
Saint-Gobain Recherche, 39 quai Lucien Lefranc, 93303 Aubervilliers CEDEX, France
2
LAPA-IRAMAT, NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France
*
Author to whom correspondence should be addressed.
Received: 3 April 2017 / Revised: 22 May 2017 / Accepted: 12 June 2017 / Published: 19 June 2017
(This article belongs to the Special Issue Fundamental and Research Frontier of Atmospheric Corrosion)
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Abstract

Reinforcing clamps made of low alloy steel from the Metz cathedral and corroded outdoors during 500 years were studied by OM, FESEM/EDS, and micro-Raman spectroscopy. The corrosion product layer is constituted of a dual structure. The outer layer is mainly constituted of goethite and lepidocrocite embedding exogenous elements such as Ca and P. The inner layer is mainly constituted of ferrihydrite. The behaviour of the inner layer under conditions simulating the wetting stage of the RH wet/dry atmospheric corrosion cycle was observed by in situ micro-Raman spectroscopy. The disappearance of ferrihydrite near the metal/oxide interface strongly suggests a mechanism of reductive dissolution caused by the oxidation of the metallic substrate and was observed for the first time in situ on an archaeological system. View Full-Text
Keywords: cultural heritage metals; iron; low alloy steel; atmospheric corrosion; in-situ measurement; micro-Raman cultural heritage metals; iron; low alloy steel; atmospheric corrosion; in-situ measurement; micro-Raman
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bouchar, M.; Dillmann, P.; Neff, D. New Insights in the Long-Term Atmospheric Corrosion Mechanisms of Low Alloy Steel Reinforcements of Cultural Heritage Buildings. Materials 2017, 10, 670.

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