Abstract

MARTINS, C. M. B.  and  MARTINS, J. I.. Mechanism of corrosion of roman coins from Senhora do Castelo. Corros. Prot. Mater. [online]. 2009, vol.28, n.4, pp.126-133. ISSN 0870-1164.

The corrosion products on bronze roman coins of Cu-base alloys from Senhora do Castelo, dated of 4^th century, have been characterized by means of optical microscopy (OM), scanning electron microscopy combined with energy dispersive spectrometry (SEM-EDS), energy dispersive X-ray fluorescence (EDXRF), and X-ray diffraction (XRD). Chemical composition of the coins was also examined. The EDS and XRD data show that lead has a high rate of corrosion, which in interaction with the environment is later precipitated as a complex chlorine-phosphate of lead with a yellow-greenish hue (pyromorphite).

Keywords : Roman Coins; Corrosion; Archaeological Artefacts.

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