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Title: EIS/VIMP screening of archaeological bronze corrosion products
Authors: Redondo-Marugán, Jorge
Doménech-Carbó, Antonio
Capelo, Sofia
Editors: Doménech-Carbó, María Teresa
Doménech-Carbó, Antonio
Keywords: Archaeological bronze
Electrochemical Impedance Measurements
Voltammetry of Immobilized Particles
Copper Compounds
Copper corrosion products
Issue Date: 2018
Publisher: Editorial Universitat Politècnica de València
Citation: Jorge Redondo-Marugán, Antonio Doménech-Carbó, Sofia Capelo, EIS/VIMP screening of archaeological bronze corrosion products, Proceedings of the 3rd European Conference on electrochemical methods applied to the conservation of artworks, Valencia, Spain, 28th March 2017.
Abstract: Electrochemical impedance measurements were applied to microparticulate deposits of copper corrosion products attached to graphite electrodes in contact with different aqueous electrolytes (0.25 M HAc/NaAc (pH 4.75), 0.10 M HCl and 0.10 M HClO 4 ) and the application of an interval of potentials between +0.25V to -0.75V. The conditions of operation were selected from a compromise between repeatability and sensitivity, being 0.10 M HClO 4 and bias potential of 0.25 V adopted. The electrochemical impedance data were modeled on the basis of available equivalent circuits for corroded metal surfaces and the correlation between several pairs of circuit elements provided the characterization of different corrosion compounds regardless the amount of microparticulate solid on the electrode. Electrochemical grouping of samples from the archaeological Roman site of Gadara (Jordan, 4 th century AD) suggests different provenances/manufacturing techniques, consistent with voltammetry of immobilized particles (VIMP) measurements. Thus, illustrating the capabilities of the intersection of such techniques in the archaeometric domain.
ISBN: 978-84-9048-698-6
Type: article
Appears in Collections:PAO - Artigos em Livros de Actas/Proceedings
CIDEHUS - Artigos em Livros de Actas/Proceedings

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