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Protection of bronze covered with patina by innoxious organic substances

Muresan, Liana; Katarina, Marusic; Stupnišek-Lisac, Ema; Otmačić Ćurković, Helena; Marušić, Katarina; Horvat Kurbegović, Šefka; Robbiola, Luc; Rahmouni, Kamal; Takenouti, Hisasi (2007) Protection of bronze covered with patina by innoxious organic substances. Electrochimica Acta, 52 (27). pp. 7770-7779. ISSN 0013-4686

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Abstract

Cultural bronze artefacts are exposed in indoor or outdoor environment. They often suffer of a substantial alteration due to an increasing atmospheric pollution. In this work, we propose the use of some innoxious compounds as corrosion inhibitors of bronze objects covered with patina. The bronze used was Cu-6Sn (in wt-%). This composition was selected after a preliminary work on several archaeological bronzes found in Transylvania, Romania, dated from the Late Neolithic to Roman periods. First, an artificial patina was formed on this bronze, under potential regulation, in 0.2g.L-1 NaHCO3+0.2g.L-1 Na2SO4 aqueous solution (pH 8), during four days. A pale blue to green patina was obtained and characterized using EDS and Raman spectroscopy. Then, four innoxious organic substances were examined as corrosion inhibitors: 5mM 4-methyl-1-(p-tolyl)-imidazole (TMI), 10mM 1-phenyl 4-methyl-imidazole (PMI), 1mM 2-mercapto 5-R-acetylamino 1, 3, 4-thiadiazole (MAcT), 1mM 2-mercapto 5-R-amino-1, 3, 4-thiadiazole (MAT), and for comparison 1mM benzotriazole (BTA) The impedance spectra collected showed, for all of them, three depressed capacitive loops. On the basis 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. TMI and MAcT were found to be efficient inhibitors though their performances are significantly lower than that of BTA.

Item Type: Article
Uncontrolled Keywords: copper-tin bronze; imidazole; thiadiazole; Raman spectroscopy; corrosion
Subjects: NATURAL SCIENCES
NATURAL SCIENCES > Chemistry
NATURAL SCIENCES > Chemistry > Physical Chemistry
TECHNICAL SCIENCES > Chemical Engineering
Divisions: UNSPECIFIED
Projects:
Project titleProject leaderProject codeProject type
Novi netoksični inhibitori korozije metala-Helena Otmačić Ćurković125-1252973-2572MZOS
Depositing User: Katarina Marušić
Date Deposited: 02 Jul 2019 08:30
Last Modified: 09 Jul 2019 11:56
URI: http://fulir.irb.hr/id/eprint/4617
DOI: 10.1016/j.electacta.2007.02.024

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