Application of Modified Tafel Analysis to the Identification of Corrosion Products on Archaeological Metals Using Voltammetry of Microparticles

Voltammetry of microparticles is applied to the identification of lead corrosion products by means of an essentially non-invasive 'one-touch' technique based on the use of graphite pencil. This methodology permits the mechanical attachment of few nanograms of sample from the surface of lead archaeological artefacts to a paraffin-impregnated graphite electrode, which, upon immersion in aqueous electrolytes, provides distinctive voltammetric responses for litharge and cotunnite- anglesite-, cerusite-based corrosion products. The reported method is applied to the identification of corrosion products in archaeological lead pieces from different Iberian sites in Valencia (Spain). © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.Financial support is gratefully acknowledged from the MEC Projects CTQ2011-28079-CO3-01 and 02 which are also supported with ERDF funds. The authors would like to thank to Dr. Jose Luis Moya Lopez and Mr. Manuel Planes Insausti (Microscopy Service of the Universitat Politecncia de Valencia) for their technical support. We would like to appreciate to Consuelo Matamoros to the Conselleria de Turismo, Cultura I Esport of the Generalitat Valenciana, and the Museu de Prehistoria deValencia, where this hoard was deposited, especially to the director Helena Bonet and the curator Manuel Gozalbes.Domenech Carbo, A.; Domenech Carbo, MT.; Pasies Oviedo, T.; Bouzas Bello, MDC. (2011). Application of Modified Tafel Analysis to the Identification of Corrosion Products on Archaeological Metals Using Voltammetry of Microparticles. Electroanalysis. 23(12):2803-2812. doi:10.1002/elan.201100577280328122312Scott, D. A. (1990). Bronze Disease: A Review of Some Chemical Problems and the Role of Relative Humidity. Journal of the American Institute for Conservation, 29(2), 193. doi:10.2307/3179583INGO, G. 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