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Micro-characterisation of innovative organic coatings applied for the protection of outdoor bronze monuments

Masi, Giulia and Josse, Claudie and Esvan, Jérôme and Bernardi, Elena and Martini, Carla and Bignozzi, Maria Chiara and Skrelp, Luka and Fabjan, Erika Svara and Kosec, Tadeja and Aufray, Maëlenn and Robbiola, Luc and Chiavari, Cristina Micro-characterisation of innovative organic coatings applied for the protection of outdoor bronze monuments. (2017) In: The Annual Congress of the European Federation of Corrosion, 20th International Corrosion Congress and Process Safety Congress 2017, 3 September 2017 - 7 September 2017 (Prague, Czech Republic).

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Official URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85052337820&partnerID=40&md5=22b1baea68f3216dabc48be647f81620


Application of protective coating is, to date, the best treatment for the protection of outdoor bronzes. In the present work, new protective organic coatings were developed taking into consideration low environmental impact, inhibiting efficiency and the nature of the patina according to the exposure geometry. The research presented in this study is a part of B-IMPACT project and aims at assessing the protectiveness of innovative organic coatings for historical and modern bronze monuments. Within this context, this work focuses on the characterisation of protective-coating/patina/bronze systems. The investigated system is related to an organic coating on an artificially patinated bronze, simulating natural patina. A quaternary as-cast alloy (Cu-Sn-Zn-Pb), as usually used for artworks, was artificially aged by simulating natural outdoor exposures, and then coated by an optimised fluorosilane coating applied by brushing. In order to understand the protective properties of this coating/patina/bronze system, the investigation was performed before and after the application of a representative accelerated ageing test. As the coated artificial patinas are a few µms thick, a fine characterisation sequence was applied for understanding of these multi-layer systems. A multi-analytical approach was performed, including conventional analytical methods such as microscopy coupled with elemental analysis (FEG-SEM with EDS) as well as X-ray Photoelectron Spectroscopy (XPS). In order to characterise the interaction between the protective coating and the patinated substrate down to the nanometric scale, structural analysis of the coated system was also investigated from cross-sections, obtained by Focused Ion Beam (FIB) coupled with FEG-SEM. Achieved information on structural homogeneity, such as (micro- and nano-) porosities and elemental distribution within the different layers of the systems, as well as the coating/patina interface cohesion are here reported.

Item Type:Conference or Workshop Item (Paper)
Additional Information:cited By 0; Conference of Joint European Corrosion Congress 2017, EUROCORR 2017 and 20th International Corrosion Congress and Process Safety Congress 2017 ; Conference Date: 3 September 2017 Through 7 September 2017; Conference Code:136637
HAL Id:hal-03624194
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (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 - UT3 (FRANCE)
Université de Toulouse > Université Toulouse - Jean Jaurès - UT2J (FRANCE)
Other partners > Slovenian national building and civil engineering institute -ZAG (SLOVENIA)
Other partners > Ministère de la culture et de la communication (FRANCE)
Laboratory name:
Deposited On:13 Feb 2019 11:27

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