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Geoarchaeology 19 (6)
Title
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Title:
Geoarchaeology 19 (6)
Series
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Series:
Geoarchaeology
Volume
Volume number and part
Volume:
19 (6)
Publication Type
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Publication Type:
Journal
Editor
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Editor:
Rolfe D Mandel
Paul Goldberg
Publisher
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Publisher:
John Wiley & Sons Ltd
Year of Publication
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Year of Publication:
2004
Source
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Source:
BIAB (The British & Irish Archaeological Bibliography (BIAB))
Relations
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URI:
http://onlinelibrary.wiley.com/doi/10.1002/gea.v19:6/issuetoc
Created Date
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Created Date:
17 Feb 2005
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Abstract
Romarchite and associated phases as common corrosion products on pewter artifacts from marine archaeological sites
Stacie E Dunkle
James R Craig
Wayne R Lusardi
531 - 552
Corrosion products were examined from typical pewter artefacts originating from six different submerged archaeological sites, dating to between c. AD 1550 and 1733, along the eastern seaboard of North and Central America. The artefacts were viewed as 270-450-year long experiments revealing the phases and mechanisms of tin corrosion in seawater. All of the samples analysed exhibit abhurite, romarchite and hydroromarchite forming at the expense of the underlying artefact. The outermost corrosion layers on several of the most corroded artefacts also exhibit cassiterite as a significant and apparently final phase to form during alteration. The absence of this mineral on many samples demonstrates that, while samples appeared to be stable under the conditions that were present, cassiterite had not yet had time to form. The very limited stability field for romarchite suggests that its presence on these artefacts may be the result of a kinetic effect. The universal appearance of this mineral on corroding tin suggests that it is a required step in the oxidation of pure tin to the final most stable phase of cassiterite. The stability of romarchite and its effectiveness as an agent of passivation can provide insight into not only the formation of tin oxides but the rate of tin corrosion.