Abstract
A methodology for monitoring washing procedures applied to stabilize archaeological iron is described. It is based on the combination of voltammetry of microparticles (VMP) with electrochemical impedance spectroscopy (EIS). A semi-empirical approach is used where the impedances at low and high frequencies were related with the fraction areas of passive and corrosion layers generated during the stabilizing treatment, the thickness, and the porosity of the corrosion layer. The variation of such parameters with the time of washing was determined from EIS data for four types of desalination procedures using concentrated NaOH and/or Na2SO3 aqueous solutions on archaeological iron artifacts. After 2 months of treatment, EIS data indicate that an essentially identical “stable” state was attained in all cases, as confirmed by the formation of a passive magnetite layer identified in VMP measurements while the rate of variation of corroded surface and porosity at short washing times varied significantly from one stabilization procedure to another.
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Financial support from the MEC Project CTQ2011-28079-CO3-02 which is supported with ERDF funds is gratefully acknowledged.
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Doménech-Carbó, A., Lastras, M., Rodríguez, F. et al. Monitoring stabilizing procedures of archaeological iron using electrochemical impedance spectroscopy. J Solid State Electrochem 18, 399–409 (2014). https://doi.org/10.1007/s10008-013-2232-y
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DOI: https://doi.org/10.1007/s10008-013-2232-y