Premium
Deterioration of iron archaeological artefacts: micro‐Raman investigation on Cl‐containing corrosion products
Author(s) -
Réguer Solenn,
Neff Delphine,
BellotGurlet Ludovic,
Dillmann Philippe
Publication year - 2007
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1659
Subject(s) - akaganéite , corrosion , raman spectroscopy , chloride , hydroxide , metallurgy , ferrous , chlorine , materials science , archaeology , mineralogy , chemistry , inorganic chemistry , goethite , history , physics , organic chemistry , adsorption , optics
Deterioration after excavation of archaeological iron artefacts buried in soil is often associated with the presence of chlorinated phases in corrosion products, leading to serious problems for conservation of metallic objects of cultural heritage. Therefore, in order to better understand the corrosion process related to the presence of chlorine, some high‐resolution techniques of material characterisation are implemented. The analyses are realised on cross sections of corroded iron objects excavated from archaeological sites dated from the 12th to the 16th century A.D. Cl‐containing phases appear even when the Cl level in the water is low. In addition to the common oxy‐hydroxide‐containing chloride, akaganeite (β–FeOOH) often mentioned in the literature, a ferrous hydroxychloride β–Fe 2 (OH) 3 Cl was also found in the corrosion layers. Moreover, part of the study is based on the preparation and desalinisation of pure akaganeite powder in order to characterise the influence of the chloride content on its crystalline structure as characterised by Raman spectroscopy. Copyright © 2007 John Wiley & Sons, Ltd.