NDLI: SEM and electrochemical characterization of bronze artifacts from the Francavilla archaeological site

Content Provider	Springer Nature Link
Author	Imbardelli, Daniela Gallucci, Maria Caterina Chidichimo, G.
Copyright Year	2016
Abstract	The excavations in the necropolis of the Francavilla Marittima archaeological area, in Calabria, have brought to light the rich burial artifacts and materials, dated between the end of the ninth and sixth centuries BCE. SEM/EDS analysis was conducted on some sections taken from a bronze artifact classifiable as an armilla or fibula fragment. Our aim was to elucidate the nature of the corrosion processes acting on the specimen. SEM investigation detected the segregation of tin towards the outer layer and a depletion of the copper content in the same region. Furthermore, the elemental distribution maps of the sections analyzed evidenced the presence of chloride ions in the border area between the corrosion patina and the metal alloy. Such anion migration of chloride ions into the interior of the alloy leads to a particular variant of the type of corrosion of structure that in the literature has been identified as structure I.A cavity electrode designed for electrochemical measurements of powders was used to perform cyclic voltammetry experiments devoted to explore the activity of the patina covering the surface of the bronze fragment. The surface layer consists mainly of tin and tin oxides; the layer immediately beneath it contains copper oxides. An increase of reactivity was shown in an acidic environment. The activity of the patina is greatly reduced at pH 5 and appears to be zero at neutral pH.
Starting Page	567
Ending Page	578
Page Count	12
File Format	PDF
ISSN	18669557
Journal	Archaeological and Anthropological Sciences
Volume Number	9
Issue Number	4
e-ISSN	18669565
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-10-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tin bronze Bronze disease SEM/EDS Cyclic voltammetry Corrosion mechanisms Earth Sciences Archaeology Chemistry/Food Science Geography Life Sciences Anthropology
Content Type	Text
Resource Type	Article
Subject	Archeology Archeology (arts and humanities) Anthropology

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