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Practical adhesion measurements of protective coatings on bronze by three-point bending test

Aufray, Maëlenn and Josse, Claudie and Balbo, Andrea and Monticelli, Cecilia and Švara Fabjan, Erika and Škrlep, Luka and Kosec, Tadeja and Gartner, Nina and Martini, Carla and Masi, Giulia and Chiavari, Cristina and Bernardi, Elena and Bignozzi, Maria Chiara and Robbiola, Luc and Babnik, Marija and Koršič, Teja and Kete, Marko Practical adhesion measurements of protective coatings on bronze by three-point bending test. (2019) Journal of Coatings Technology and Research, 16 (5). 1465-1477. ISSN 1547-0091

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Official URL: https://doi.org/10.1007/s11998-019-00230-5

Abstract

When attempting to sufficiently protect outdoor bronze monuments from corrosion, searches for an effective solution are usually based on coating applications which have a high anticorrosive efficiency. In order to correctly assess the level of protection provided by such coatings, adherence (practical adhesion) measurements need to be performed for the proper evaluation of the deterioration of coating systems with aging. Although a coupled study of adherence with aging would be of great interest, very few such studies are available. In this work, a methodological approach is proposed for the evaluation of coatings applied to metallic cultural heritage monuments of, based on the use of a three-point bending test. Adherence characterization of different protective coatings has been performed both on bare and on traditionally black-patinated bronze coupons (Cu–Sn alloy with 5.9 wt% Sn), which were used as basic model substrates. The investigated coatings were Incralac®, silane, sol–gel oxysilane, and a silane-modified polymethacrylate (an adhesion promoter for fluoropolymer). The results of measurements which were obtained before and after accelerated aging in concentrated acid rain made it possible to more easily differentiate between the various adherence levels of different coating systems. Coupled with adherence measurements, the results of systematic optical and SEM observation of the different failure morphologies are also presented. In the case of the coated bare alloy, adhesive failures were mainly observed. The silane (PropS-SH) coating showed the best adherence. In the case of the patinated bronze test specimens, only cohesive failures occurred. Adherence is directly related to the cohesion of the black patina rather than that of the applied coating. It was observed that aging reduces the level of the adherence.

Item Type:Article
HAL Id:hal-02535686
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 - Toulouse INP (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (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)
Laboratory name:
Funders:
M-Era.Net European project
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Deposited On:07 Apr 2020 15:04

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