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Characterization of typical patinas simulating bronze corrosion in outdoor conditions

Masi, Giulia and Esvan, Jérôme and Josse, Claudie and Chiavari, Cristina and Bernardi, Elena and Martini, Carla and Bignozzi, Maria Chiara and Gartner, Nina and Kosec, Tadeja and Robbiola, Luc Characterization of typical patinas simulating bronze corrosion in outdoor conditions. (2017) Materials Chemistry and Physics, 200. 308-321. ISSN 0254-0584

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Official URL: https://doi.org/10.1016/j.matchemphys.2017.07.091

Abstract

In order to bring the treatment of historical bronze monuments in line with proper engineering practice and cultural heritage regulations, the standardisation of artificially aged surfaces that are comparable with natural ones is still to take place. In this aim, this investigation reports a comparative study of corroded quaternary bronze samples produced by accelerated ageing tests, simulating the unsheltered and sheltered exposure conditions mainly affecting outdoor bronze monuments. The effects of run off in a dropping test (unsheltered simulation) and the exposure to stagnant acid rain in a wet & dry test (sheltered simulation) on a bronze surface were studied. A multi-analytical approach was performed including conventional analytical methods, such as a microscopy examination coupled with elemental and structural analyses of the surface. In addition, a focused ion beam (FIB) was used to produce cross sections in the size range up to a few tens of nanometres. It is evidenced that the corrosion layers, forming a nano-porous structure, are linked to a decuprification process marked by the preferential dissolution of Cu and Zn and the formation of a Sn-O species network within the barrier layer. A correlation between the tin content of the alloy and the corrosion amplitude is shown: the anodic areas are related to the lowest tin-content part of the alpha phase (in the centre of the dendrite), while the eutectoid areas (including the delta phase) are cathodic and therefore not attacked. The corroded samples artificially aged are well representative of natural corrosion structures observed on outdoor bronzes. (C) 2017 Elsevier B.V. All rights reserved.

Item Type:Article
HAL Id:hal-01997535
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole des Hautes Etudes en Sciences Sociales - EHESS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Other partners > Università di Bologna (ITALY)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Université de Toulouse > Université Toulouse - Jean Jaurès - UT2J (FRANCE)
Other partners > Slovenian national building and civil engineering institute -ZAG (SLOVENIA)
French research institutions > Institut National de Recherches Archéologiques Préventives - INRAP (FRANCE)
Other partners > Ministère de la culture et de la communication (FRANCE)
Laboratory name:
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Deposited By: Luc Robbiola
Deposited On:29 Jan 2019 09:09

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