Protection of bronze covered with patina by innoxious organic substances
| Autor: | Kamal Rahmouni, Luc Robbiola, Ema Stupnišek-Lisac, Helena Otmačić, Liana Maria Muresan, Simona Varvara, S. Horvat-Kurbegović, Katarina Marušić, Hisasi Takenouti |
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| Přispěvatelé: | Babes-Bolyai University [Cluj-Napoca] (UBB), University of Alba Iulia, Alba Iulia, 510009, Romania, University of Zagreb, Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL), Laboratoire Interfaces et Systèmes Electrochimiques (LISE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), The authors gratefully acknowledge the EGIDE for the financial support of scientists exchange to perform the present study under the licence number EcoNet 10 279NA and the project MA03/70. |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
copper-tin bronze
imidazole thiadiazole Raman spectroscopy corrosion General Chemical Engineering Double-layer capacitance chemistry.chemical_element Copper–tin bronze Imidazole Thiadiazole Corrosion 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Physical Chemistry Corrosion inhibitor chemistry.chemical_compound NATURAL SCIENCES Electrochemistry [CHIM]Chemical Sciences Bronze Aqueous solution Benzotriazole Copper-Tin bronze Metallurgy Chemical Engineering 021001 nanoscience & nanotechnology Copper 0104 chemical sciences Chemistry chemistry 13. Climate action engineering 0210 nano-technology Tin |
| Zdroj: | Electrochimica Acta Electrochimica Acta, 2007, 52 (27), pp.7770-7779. ⟨10.1016/j.electacta.2007.02.024⟩ |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2007.02.024⟩ |
| Popis: | Archaeological or cultural bronze artefacts are exposed in indoor or in outdoor. They often suffer of a substantial alteration due to a increasing atmospheric pollution. It becomes, therefore, necessary to protect them efficiently together with patina layer. The use of clear-coating or wax with some corrosion inhibitors such benzotriazole are largely employed in museum, but they modify the visual aspects and also the inhibitors employed are often noxious or even toxic. In this work, we propose use of some innoxious compounds to use as corrosion inhibitor of bronze artefacts covered with patina. The bronze used was Cu-5Sn. This composition was selected after a preliminary work on several archaeological bronzes found in Transylvania, Romania, dated of Neolithic period. First, the patina was formed on this bronze, under potential regulation, in NaHCO3+Na2SO4, pH 8, solution during three days. A light blue patina was obtained. These specimens were then dipped into an aqueous solution of various organic compounds during three hours. The organic compounds examined were 1mM methyl-tolyl-imidazole, 5mM 1-phenyl 4-methyl-imidazole, 0.1mM 2-mercapto-5-R-amino-1, 3, 4-thiadiazole, and for comparison benzo-triazole. The corrosion behaviour was examined in the same solution to the patina formation, but pH of which was adjusted to 5 by addition of H2SO4.The impedance spectra collected showed, all of them, three depressed capacitive loops. On the bases of these capacitance values, these loops were allocated to the surface film with ionic conduction, the double layer capacitance with the charge transfer resistance, and the oxidation – reduction process involving the surface patina. The protective effectiveness determined from the resistances increased with the immersion period. The authors gratefully acknowledge the EGIDE to financial support of this project under the licence number EcoNet 10 279NA. |
| Databáze: | OpenAIRE |
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