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Crossing VIMP and EIS for studying heterogeneous sets of copper/bronze coins

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Abstract

Electrochemical impedance spectroscopy (EIS) and voltammetry of immobilized particles (VIMP) measurements using air-saturated mineral water and 0.10 M NaClO4 aqueous solution as electrolytes were applied to eurocent coins and a set of copper/bronze coins from the late nineteenth century exhibiting significant heterogeneity in their degree and type of corrosion. The obtained data presented satisfactory repeatability being fitted to relatively simple equivalent circuits which were dependent on the electrolyte and bias potential, the more satisfactory conditions being obtained using the reduction of dissolved oxygen as a redox probe. Consistent data were obtained using VIMP and EIS characterizing different corrosion patterns, and establishing the possibility of discriminating different monetary emissions in favorable cases of high level of corrosion.

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Funding

Project CTQ2017-85317-C2-1-P, which is supported with Ministerio de Economía, Industria y Competitividad (MINECO) and Fondo Europeo de Desarrollo Regional (ERDF) funds, and Agencia Estatal de Investigación (AEI) and PhD grants of the Department of Earth Sciences, Sapienza University of Rome, are gratefully acknowledged.

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Authors and Affiliations

  1. Department of Earth Sciences, Sapienza University of Rome, P.le Aldo Moro 5, Rome, Italy

    Francesca Di Turo

  2. Division de Ingenieria Mecanica e Industrial, Facultad de Ingenieria, Universidad Nacional Autonoma de Mexico (UNAM), Ciudad Universitaria, 04510 Coyacán, CDMX, Mexico

    Rafael Parra

  3. Departament de Química Analítica, Universitat de València, Dr. Moliner, 50, Burjassot, 46100, València, Spain

    Joan Piquero-Cilla & Antonio Doménech-Carbó

  4. Department of Chemistry and Drug Technologies, Sapienza University of Rome, P.le Aldo Moro 5, Rome, Italy

    Gabriele Favero

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  1. Francesca Di Turo
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  2. Rafael Parra
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  3. Joan Piquero-Cilla
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  4. Gabriele Favero
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  5. Antonio Doménech-Carbó
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Correspondence to Francesca Di Turo or Antonio Doménech-Carbó.

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Di Turo, F., Parra, R., Piquero-Cilla, J. et al. Crossing VIMP and EIS for studying heterogeneous sets of copper/bronze coins. J Solid State Electrochem 23, 771–781 (2019). https://doi.org/10.1007/s10008-018-04182-5

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