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Micro-chemical and metallurgical study of Samnite bronze belts from ancient Abruzzo (central Italy, VIII–IV BC)

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Abstract

The Samnite bronze belts and the chest disk cuirasses (VIII–IV BC) are the distinctive defensive weapons of the Samnite warriors having likely also a symbolic relevance. These artefacts were mainly found during the archaeological excavations of warriors’ graves from ancient Abruzzo (central Italy). Their chemical composition, metallurgical features and corrosion products formed during the long-term burial have been studied by means of the combined use of analytical techniques such as optical microscopy (OM), scanning electron microscopy coupled with energy-dispersive X-ray micro-analysis (SEM–EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The micro-chemical and structural results show that the bronze belts have often been produced by using unusual high-tin bronze alloys achieving a silver-like appearance and by performing tailored cycles of thermal treatments under reducing conditions and hot mechanical working aimed to shape the high-tin alloys in the form of a thin bronze sheet. Furthermore, the investigation has shown that the main alloying elements have been transformed during the burial into mineral species giving rise to the formation of stratified structures constituted by different mineral phases such as tin oxides, cuprous oxide (Cu2O) and copper carbonates (azurite (Cu3(CO3)2(OH)2 and malachite (CuCO3Cu(OH)2)) as well as dangerous chlorine-based compounds such as nantokite (CuCl) and atacamite (Cu2(OH)3Cl) polymorphs. This information evidences the strict interaction of the alloying elements with the soil components as well as the occurrence of the copper cyclic corrosion as a post-burial degradation phenomenon. The present study confirms that the combined micro-chemical and micro-structural investigation techniques such as SEM–EDS, XPS, XRD and OM can be successfully used to investigate the technological production processes of the ancient artefacts and to achieve the detailed micro-chemical and structural description of the corrosion products useful for the identification of degradation agents and mechanisms and, thereafter, to propose a reliable tailored strategy for the conservation.

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Acknowledgements

The activities have been performed in the framework of the bilateral project between Italy (Soprintendenza per i Beni Archeologici dell’Abruzzo, Ministero per i Beni e le Attività Culturali) and Confederation Helvetique for the protection of cultural heritage.

Author information

Authors and Affiliations

  1. Istituto per lo Studio dei Materiali Nanostrutturati—CNR, Area Ricerca RM1—Montelibretti, via Salaria km 29.5, 00015, Monterotondo Stazione, Rome, Italy

    Cristina Riccucci, Gabriel Maria Ingo, Erica Isabella Parisi, Gabriella Di Carlo & Tilde De Caro

  2. Soprintendenza per i Beni Archeologici dell’Abruzzo, Via degli Agostiniani 14, 66100, Chieti, Italy

    Amalia Faustoferri & Maria Isabella Pierigè

  3. Dipartimento Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Turin, Italy

    Federica Faraldi

Authors
  1. Cristina Riccucci
  2. Gabriel Maria Ingo
  3. Amalia Faustoferri
  4. Maria Isabella Pierigè
  5. Erica Isabella Parisi
  6. Gabriella Di Carlo
  7. Tilde De Caro
  8. Federica Faraldi

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Correspondence toCristina Riccucci.

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Riccucci, C., Ingo, G.M., Faustoferri, A.et al. Micro-chemical and metallurgical study of Samnite bronze belts from ancient Abruzzo (central Italy, VIII–IV BC).Appl. Phys. A113, 959–970 (2013). https://doi.org/10.1007/s00339-013-7723-2

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