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Comparative studies of chemical and electrochemical preparation of artificial bronze patinas and their protection by corrosion inhibitor

Marušić, Katarina; Otmačić Ćurković, Helena; Horvat-Kurbegović, Šefka; Takenouti, Hisasi; Stupnišek-Lisac, Ema (2009) Comparative studies of chemical and electrochemical preparation of artificial bronze patinas and their protection by corrosion inhibitor. Electrochimica Acta, 54 (27). pp. 7106-7113. ISSN 0013-4686

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Abstract

The bronze artefacts of cultural heritage are often covered with patina, a layer of corrosion products, which confers their aesthetic and also protects the substrate bronze. Due to the increasing atmospheric pollution these layers are often dissolving when exposed in urban environment. In this work we propose the use of an innoxious imidazole compound as a corrosion inhibitor for patinated bronze. On a Cu-6Sn (wt%) bronze, three types of patinas were synthesized: two chemical methods (in a sulphate solution and a chloride one) and an electrochemical process (in a sulphate / carbonate solution). A blue-green patina was obtained in all three cases, and their morphological and structural characterization was performed by SEM, EDS and Raman spectroscopy. It was found that the sulphate patina is composed essentially of brochantite, the chloride patina of atacamite, and the electrochemical patina of malachite. All three patinas have also a smooth part of surface consisted of cuprite. As corrosion inhibitor 4-methyl 1-(p-tolyl) imidazole was used on all patinas, in a solution of 0.2 g L-1 Na2SO4 + 0.2 g L-1 NaHCO3 acidified to pH5 which simulates acid rain in urban environment. The results have shown that the inhibitor improves the stability of all three kinds of patinas and can be recommended for protection of works of art.

Item Type: Article
Uncontrolled Keywords: Copper-tin bronze patina; Raman spectroscopy; Imidazole; EIS; Urban acid rain
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 10:18
Last Modified: 03 Jul 2019 12:52
URI: http://fulir.irb.hr/id/eprint/4620
DOI: 10.1016/j.electacta.2009.07.014

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