A Synchrotron‐Based Study of the Mary Rose Iron Cannonballs
File(s)
Published version
Author(s)
Type
Journal Article
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 (Na2CO3/NaHCO3); however, hibbingite, β‐Fe2(OH)3Cl, 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)3Cl at near‐neutral pH.
Date Issued
2018-06-18
Date Acceptance
2018-03-08
Citation
Angewandte Chemie, 2018, 57 (25), pp.7390-7395
ISSN
1521-3757
Publisher
Wiley
Start Page
7390
End Page
7395
Journal / Book Title
Angewandte Chemie
Volume
57
Issue
25
Copyright Statement
© 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.
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.
Subjects
03 Chemical Sciences
Organic Chemistry
Publication Status
Published
Date Publish Online
2018-03-08