Watkinson, David E., Rimmer, Melanie B. and Emmerson, Nicola J.
2019.
The Influence of relative humidity and intrinsic chloride on post-excavation corrosion rates of archaeological wrought iron.
Studies in Conservation
64
(9)
, pp. 456-471.
10.1080/00393630.2018.1565006
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Abstract
This study examined the impact of relative humidity (RH) on the corrosion rate of 129 archaeological iron nails from two sites. Oxygen consumption of individual nails in controlled RH was used as a corrosion rate proxy to deliver quantitative data on corrosion rate as a function of RH. This was negligible at 20% RH, slow up to 40% RH for both sites, and increased rapidly at 60% RH for Roman nails from Caerleon (Wales) and at 70% RH for medieval nails from Billingsgate (London). The nails were digested and their chloride content was determined and related to their oxygen consumption at specific RH values. While a generic pattern of corrosion as a function of chloride was identified, for any single concentration of chloride corrosion rate was not predictable. Desiccation is in common use to control post-excavation corrosion of archaeological iron; quantifying how differing levels of desiccation changed corrosion rate provided a scaled tool for identifying corrosion risk, estimating object longevity, and calculating cost benefit for storage options.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | History, Archaeology and Religion |
Publisher: | Taylor & Francis |
ISSN: | 0039-3630 |
Funders: | AHRC/EPSRC |
Date of First Compliant Deposit: | 14 February 2019 |
Date of Acceptance: | 29 December 2018 |
Last Modified: | 14 Oct 2019 11:18 |
URI: | http://orca.cf.ac.uk/id/eprint/119464 |
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