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X-ray Photoelectron Spectroscopy as a tool to investigate silane-based coatings for the protection of outdoor bronze: The role of alloying elements

Masi, Giulia and Balbo, Andrea and Esvan, Jérôme and Monticelli, Cecilia and Avila, José and Robbiola, Luc and Bernardi, Elena and Bignozzi, Maria Chiara and Asensio, Maria C. and Martini, Carla and Chiavari, Cristina X-ray Photoelectron Spectroscopy as a tool to investigate silane-based coatings for the protection of outdoor bronze: The role of alloying elements. (2018) Applied Surface Science, 433. 468-479. ISSN 0169-4332

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Official URL: https://doi.org/10.1016/j.apsusc.2017.10.089

Abstract

Application of a protective coating is the most widely used conservation treatment for outdoor bronzes (cast Cu-Sn-Zn-Pb-Sb alloys). However, improving coating protectiveness requires detailed knowledge of the coating/substrate chemical bonding. This is particularly the case for 3-mercapto-propyl-trimethoxy-silane (PropS-SH) applied on bronze, exhibiting a good protective behaviour in outdoor simulated conditions. The present work deals with X-Ray Photoelectron Spectroscopy (XPS) and Electron Microscopy (FEG-SEM + FIB (Focused Ion Beam)) characterization of a thin PropS-SH film on bronze. In particular, in order to better understand the influence of alloying elements on coating performance, PropS-SH was studied first on pure Cu and Sn substrates then on bronzes with increasing alloy additions: Cu8Sn as well as a quinary Cu-Sn-Zn-Pb-Sb bronze. Moreover, considering the real application of this coating on historical bronze substrates, previously artificially aged (''patinated'') bronze samples were prepared and a comparison between bare and ``patinated'' quinary bronzes was performed. In the case of coated quinary bronze, the free surface of samples was analysed by High Resolution Photoelectron Spectroscopy using Synchrotron Radiation (HR-SRPES) at ANTARES (Synchrotron SOLEIL), which offers a higher energy and lateral resolution. By compiling complementary spectroscopic and imaging information , a deeper insight into the interactions between the protective coating and the bronze substrate was achieved. (C) 2017 Elsevier B.V. All rights reserved.

Item Type:Article
HAL Id:hal-01997469
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)
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)
French research institutions > Institut National de Recherches Archéologiques Préventives - INRAP (FRANCE)
Other partners > Ministère de la culture et de la communication (FRANCE)
Other partners > Università degli Studi di Ferrara - UNIFE (ITALY)
Laboratory name:
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Deposited By: Luc Robbiola
Deposited On:29 Jan 2019 08:37

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