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Evaluation of the protectiveness of an organosilane coating on patinated Cu-Si-Mn bronze for contemporary art

Masi, Giulia and Josse, Claudie and Esvan, Jérôme and Chiavari, Cristina and Bernardi, Elena and Martini, Carla and Bignozzi, Maria Chiara and Monticelli, Cecilia and Zanotto, Federica and Balbo, Andrea and Svara Fabjan, Erika and Kosec, Tadeja and Robbiola, Luc Evaluation of the protectiveness of an organosilane coating on patinated Cu-Si-Mn bronze for contemporary art. (2019) Progress in Organic Coatings, 127. 286-299. ISSN 0300-9440

(Document in English)

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Official URL: https://doi.org/10.1016/j.porgcoat.2018.11.027


A 3-mercapto-propyl-trimethoxysilane coating (PropS-SH) applied on Cu-Si-Mn bronze, patinated by “liver of sulphur”, was investigated as a non-toxic alternative to Incralac®, usually applied on outdoor artistic bronzes. Electrochemical testing was performed in synthetic acid rain. Exposure to temperature/UV cycles and accelerated corrosion test simulating unsheltered exposure to rainwater was also carried out. The exposed samples were characterised by FEG-SEM coupled with EDS on FIB cross-sections and XPS on free surfaces. The black patina without protective coating was scarcely protective against bronze corrosion and easily transformed into cuprous oxide. PropS-SH coating fully preserved the black patina microstructure and phase constituents (cuprous oxide and cuprous sulphide). The PropS-SH coating also resulted more protective than Incralac® when aged under run-off conditions. Selective dissolution of copper from the silicon bronze alloy was observed on both uncoated and Incralac®-coated bronze, leading to the formation of an internal Si-rich corrosion layer.

Item Type:Article
HAL Id:hal-02324843
Audience (journal):International peer-reviewed journal
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)
Other partners > Università degli Studi di Ferrara - UNIFE (ITALY)
Laboratory name:
Deposited On:22 Oct 2019 07:55

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