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A Synchrotron-Based Study of the Mary Rose Iron Cannonballs.

Simon, H; Cibin, G; Robbins, P; Day, S; Tang, C; Freestone, I; Schofield, E; (2018) A Synchrotron-Based Study of the Mary Rose Iron Cannonballs. Angew Chem Int Ed Engl , 57 (25) pp. 7390-7395. 10.1002/anie.201713120. Green open access

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Abstract

Post-excavation iron corrosion may be accelerated by the presence of Cl- , leading to conservation methods designed to remove Cl. This study exploits a unique opportunity to assess 35 years of conservation applied to cast-iron cannon shot excavated from the Mary Rose. A combination of synchrotron X-ray powder diffraction (SXPD), absorption spectroscopy (XAS), and fluorescence (XRF) mapping have been used to characterise the impact of conservation on the crystalline corrosion products, chlorine distribution, and speciation. The chlorinated phase akaganeite, β-FeO(OH,Cl), was found on shot washed in corrosion inhibitor Hostacor IT with or without an additional reduction stage. No chlorinated phases were observed on the surface of shot stored in sodium sesquicarbonate (Na2 CO3 /NaHCO3 ); however, hibbingite, β-Fe2 (OH)3 Cl, was present in metal pores. It is proposed that surface β-FeO(OH,Cl) formed in the early stages of active conservation owing to oxidation of β-Fe2 (OH)3 Cl at near-neutral pH.

Type: Article
Title: A Synchrotron-Based Study of the Mary Rose Iron Cannonballs.
Location: Germany
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/anie.201713120
Publisher version: https://doi.org/10.1002/anie.201713120
Language: English
Additional information: © 2018 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Keywords: X-ray absorption spectroscopy, archaeology, chlorine, corrosion, iron
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of SandHS > Institute of Archaeology
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of SandHS > Institute of Archaeology > Institute of Archaeology Gordon Square
URI: http://discovery.ucl.ac.uk/id/eprint/10051016
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