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B-IMPACT project: eco-friendly and non-hazardous coatings for the protection of outdoor bronzes

Masi, Giulia and Aufray, Maëlenn and Balbo, Andrea and Bernardi, Elena and Bignozzi, Maria Chiara and Chiavari, Cristina and Esvan, Jérôme and Gartner, Nina and Grassi, Vincenzo and Josse, Claudie and Kosec, Tadeja and Martini, Carla and Monticelli, Cecilia and Škrlep, Luka and Sperotto, Walter and Švara Fabjan, Erika and Tedesco, Erik and Zanotto, Federica and Robbiola, Luc B-IMPACT project: eco-friendly and non-hazardous coatings for the protection of outdoor bronzes. (2020) In: IOP Conference Series: Materials Science and Engineering, 14 October 2020 - 16 October 2020 (Florence, Italy).

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Official URL: https://doi.org/10.1088/1757-899X/949/1/012097

Abstract

Application of protective coatings is the most widely used conservation treatment for outdoor bronzes. Eco-friendly and non-hazardous coatings are currently needed for conservation of outdoor bronze monuments. To fulfil this need, the M-ERA.NET European research project B-IMPACT (Bronze-IMproved non-hazardous PAtina CoaTings) aimed at assessing the protectiveness of innovative coatings for historical and modern bronze monuments exposed outdoors.In this project, two bronze substrates (historical Cu-Sn-Zn-Pb and modern Cu-Si-Mn alloys) were artificially patinated, by acid rain solution using dropping test and by “liver of sulphur” procedure (K2S aqueous solution)to obtain black patina, respectively. Subsequently, the application of several newly developedprotective coatings was carried out and their performance was investigated by preliminary electrochemical tests. In the following stepsof the work, the assessment of the best-performing coatings was carried out and their performance was compared to Incralac, one of the most widely used protective coatings in conservation practice. A multi-analytical approach was adopted,considering artificial ageing (carried out in representative conditions, including exposure to rain runoff, stagnant rain and UV radiation)and metal release, as well as visual aspect (so as to include aesthetical impact among the coating selection parameters) and morphological and structural evolution of the coated surfaces due to simulated outdoor exposure. Lastly, also the health impact of selected coatings was assessed by occupational hazard tests. The removability and re-applicability of the best-performing coatings were also assessed.The best alternatives to the conventional Incralac exhibited were: (i) fluoroacrylate blended with methacryloxy-propyl-trimethoxy-silane (FA-MS) applied on patinated Cu-Sn-Zn-Pb bronze and (ii) 3-mercapto-propyl-trimethoxysilane (PropS-SH) applied on patinated Cu-Si-Mn bronze

Item Type:Conference or Workshop Item (Paper)
Additional Information:Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
HAL Id:hal-03107661
Audience (journal):International peer-reviewed journal
Audience (conference):International conference proceedings
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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 > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:12 Jan 2021 16:42

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