Practical adhesion measurements of protective coatings on bronze by three-point bending test / Maëlenn Aufray in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1465-1477 Titre : Practical adhesion measurements of protective coatings on bronze by three-point bending test Type de document : texte imprimé Auteurs : Maëlenn Aufray, Auteur ; Claudie Josse, Auteur ; Andrea Balbo, Auteur ; Cecilia Monticelli, Auteur ; Erika Svara Fabjan, Auteur ; Luka Skrlep, Auteur ; Tadeja Kosec, Auteur ; Nina Gartner, Auteur ; Carla Martini, Auteur ; Giulia Masi, Auteur ; Cristina Chiavari, Auteur ; Elena Bernardi, Auteur ; Maria Chiara Bignozzi, Auteur ; Luc Robbiola, Auteur ; Marija Babnik, Auteur ; Teja Korsic, Auteur ; Marko Kete, Auteur Année de publication : 2019 Article en page(s) : p. 1465-1477 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Bronze Essais dynamiques Evaluation Flexion trois points Métaux -- Revêtements protecteurs Objets d'art -- Conservation et restauration Patine Revêtements -- Détérioration Index. décimale : 667.9 Revêtements et enduits Résumé : 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. Note de contenu : - EXPERIMENTAL : Materials - The aging method - Practical adhesion measurements - Adhesive failure observation and surface characterization - RESULTS AND DISCUSSION : Coated bare bronze (B) - Coated patinated bronze (P) DOI : 10.1007/s11998-019-00230-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00230-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33025 [article]

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