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Marchand, G., Guilminot, E., Lemoine, S., Rossetti, L., Vieau, M. & Stephant, N. (2014) Degradation of archaeological horn silver artefacts in burials. Heritage Science, 2 5. 
Added by: Richard Baschera (2016-08-30 09:08:29)   Last edited by: Richard Baschera (2017-02-02 14:35:34)
Type de référence: Article
DOI: 10.1186/2050-7445-2-5
Numéro d'identification (ISBN etc.): 2050-7445
Clé BibTeX: Marchand2014
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Catégories: IMN
Mots-clés: Archaeological objects, Horn silver, Inner/outer corrosion layer, Original surface, SEM-EDS analysis
Créateurs: Guilminot, Lemoine, Marchand, Rossetti, Stephant, Vieau
Collection: Heritage Science
Consultations : 12/519
Indice de consultation : 3%
Indice de popularité : 0.75%
Liens URLs     http://heritagesci ... 1186/2050-7445-2-5
Résumé     

Background

Archaeological silver objects from burial sites are of a grey-lavender aspect. The formation of AgCl leads to an increase in the volume of the objects, which may undergo a complete transformation into corrosion products. This degradation process has been little studied to date. In this paper, eight horn silver objects were studied by SEM and XRD.

Results

Analyses showed a corrosion system composed of bi-layers: a compact inner layer and a porous outer layer. Corrosion products were mainly silver chlorides (AgCl), chlorargyrite. Some objects displayed copper inclusions both in the metallic core and in the inner layer. Highly mineralized objects contained other oxygen-rich phases (with Si, Ca) in the inner layer. Soil markers were detected in the outer layer.

Conclusion

Based on these results, we put forward a corrosion mechanism for horn silver objects. Silver chloride is formed by the disappearance of the initial silver oxide layer. This AgCl layer is not protective and supports ion transport. Thus an outer layer of silver chloride, incorporating soil markers, is formed.


  
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