Optimisation of the setup of LPR and EIS measurements for the onsite, non-invasive study of metallic artefacts
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ORIGINAL PAPER
Optimisation of the setup of LPR and EIS measurements for the onsite, non-invasive study of metallic artefacts Chiara Petiti 1
&
Davide Gulotta 1,2 & Bruna Mariani 3 & Lucia Toniolo 1 & Sara Goidanich 1
Received: 19 March 2020 / Revised: 4 September 2020 / Accepted: 7 September 2020 / Published online: 30 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Electrochemical techniques have been successfully applied in the past as non-destructive techniques to the cultural heritage field. In particular, linear polarisation resistance (LPR) and electrochemical impedance spectroscopy (EIS) have been employed for the onsite monitoring of corrosion on metallic works of art, providing valuable results. Such techniques have been successfully adapted from the industrial field for this particular kind of application, but a systematic evaluation of the influence of all experimental settings on the obtained results is still lacking: several factors and parameters can affect the results, and it is important to properly consider their influence for a reliable interpretation of data. Therefore, in this work, the influence of a series of experimental parameters was evaluated in order to obtain a reliable and time-effective setup by performing a series of tests on a bronze artefact. Several variables were considered, with particular attention to those affecting the reproducibility and reliability of the measurements, as well as the duration of each single acquisition. It was demonstrated, in fact, that an optimised experimental setup from the point of view of the duration could improve also reproducibility and reliability of the measurements. The optimised protocol was then adopted in the framework of a diagnostic campaign of the Monumento ai Caduti (War Memorial) of Lecco (IT) Keywords Corrosion rate . Non-destructive electrochemical techniques . Bronze artefacts . Onsite measurements
Introduction Non-destructive and in situ measurements are fundamental tools in the field of artworks conservation, since they can provide valuable information non-invasively and without sampling or moving the cultural heritage artefacts.
In memory of Bruna Mariani Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10008-020-04822-9) contains supplementary material, which is available to authorized users. * Chiara Petiti [email protected]; [email protected] 1
Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, Italy
2
Getty Conservation Institute, 1200 Getty Center Drive, Suite, Los Angeles, CA 700, USA
3
Department Of Restoration, Fonderia Artistica Battaglia, Via Privata Oslavia, 17, 20134 Milan, Italy
For what concerns the metallic artworks, electrochemical techniques can offer valuable methodologies to perform in situ and non-destructive or micro-invasive characterisation of the surfaces [1–8]. Among them, in particular, linear polarisation resist
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