Corrosion products and microstructure of copper alloy coins from the Byzantine-period Ma'agan Mikhael B shipwreck, Israel

A. Inberg; D. Ashkenazi; M. Cohen; N. Iddan; D. Cvikel

doi:10.1016/j.microc.2018.08.033

Corrosion products and microstructure of copper alloy coins from the Byzantine-period Ma'agan Mikhael B shipwreck, Israel

A. Inberg, D. Ashkenazi, M. Cohen, N. Iddan, D. Cvikel

Department of Maritime Civilizations

Research output: Contribution to journal › Article › peer-review

Abstract

Seven coins, covered with black concretion coating, found in the Byzantine-period Ma'agan Mikhael B shipwreck, were examined in this study. Metallurgical methods comprising visual testing, XRF, multi-focal light microscopy, SEM-EDS analysis and Raman spectroscopy, were used to determine the corrosion products and microstructure of the coins. The analysis results show that the coins were made of copper-lead alloy with a heterogeneous microstructure of bright and dark metal areas. The external surfaces of the coins were mostly composed of oxides and corrosion product compounds rich in Cu, Pb and Sn, while the external dark concretion coating was rich in Si, S, Ca and C compounds. Gradual variation of the composition and structure of the oxides and concretion coating layers was observed.

Original language	English
Pages (from-to)	400-409
Number of pages	10
Journal	Microchemical Journal
Volume	143
DOIs	https://doi.org/10.1016/j.microc.2018.08.033
State	Published - Dec 2018

Bibliographical note

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

Black concretion
Copper-lead coins
Corrosion products
Ma'agan Mikhael B shipwreck
Materials characterization
Microstructure

ASJC Scopus subject areas

Analytical Chemistry
Spectroscopy

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10.1016/j.microc.2018.08.033

Cite this

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title = "Corrosion products and microstructure of copper alloy coins from the Byzantine-period Ma'agan Mikhael B shipwreck, Israel",

abstract = "Seven coins, covered with black concretion coating, found in the Byzantine-period Ma'agan Mikhael B shipwreck, were examined in this study. Metallurgical methods comprising visual testing, XRF, multi-focal light microscopy, SEM-EDS analysis and Raman spectroscopy, were used to determine the corrosion products and microstructure of the coins. The analysis results show that the coins were made of copper-lead alloy with a heterogeneous microstructure of bright and dark metal areas. The external surfaces of the coins were mostly composed of oxides and corrosion product compounds rich in Cu, Pb and Sn, while the external dark concretion coating was rich in Si, S, Ca and C compounds. Gradual variation of the composition and structure of the oxides and concretion coating layers was observed.",

keywords = "Black concretion, Copper-lead coins, Corrosion products, Ma'agan Mikhael B shipwreck, Materials characterization, Microstructure",

author = "A. Inberg and D. Ashkenazi and M. Cohen and N. Iddan and D. Cvikel",

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year = "2018",

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doi = "10.1016/j.microc.2018.08.033",

language = "English",

volume = "143",

pages = "400--409",

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AU - Inberg, A.

AU - Ashkenazi, D.

AU - Cohen, M.

AU - Iddan, N.

AU - Cvikel, D.

PY - 2018/12

Y1 - 2018/12

N2 - Seven coins, covered with black concretion coating, found in the Byzantine-period Ma'agan Mikhael B shipwreck, were examined in this study. Metallurgical methods comprising visual testing, XRF, multi-focal light microscopy, SEM-EDS analysis and Raman spectroscopy, were used to determine the corrosion products and microstructure of the coins. The analysis results show that the coins were made of copper-lead alloy with a heterogeneous microstructure of bright and dark metal areas. The external surfaces of the coins were mostly composed of oxides and corrosion product compounds rich in Cu, Pb and Sn, while the external dark concretion coating was rich in Si, S, Ca and C compounds. Gradual variation of the composition and structure of the oxides and concretion coating layers was observed.

AB - Seven coins, covered with black concretion coating, found in the Byzantine-period Ma'agan Mikhael B shipwreck, were examined in this study. Metallurgical methods comprising visual testing, XRF, multi-focal light microscopy, SEM-EDS analysis and Raman spectroscopy, were used to determine the corrosion products and microstructure of the coins. The analysis results show that the coins were made of copper-lead alloy with a heterogeneous microstructure of bright and dark metal areas. The external surfaces of the coins were mostly composed of oxides and corrosion product compounds rich in Cu, Pb and Sn, while the external dark concretion coating was rich in Si, S, Ca and C compounds. Gradual variation of the composition and structure of the oxides and concretion coating layers was observed.

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KW - Ma'agan Mikhael B shipwreck

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KW - Microstructure

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Corrosion products and microstructure of copper alloy coins from the Byzantine-period Ma'agan Mikhael B shipwreck, Israel

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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