%0 Journal Article
%T Mecanismo de corros£¿o em numismas de ¨¦poca romana provenientes da Senhora do Castelo
%A Martins
%A C. M. B.
%A Martins
%A J. I.
%J Corros£¿o e Protec£¿£¿o de Materiais
%D 2009
%I Scientific Electronic Library Online
%X the corrosion products on bronze roman coins of cu-base alloys from senhora do castelo, dated of 4th 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).
%K roman coins
%K corrosion
%K archaeological artefacts.
%U http://www.scielo.gpeari.mctes.pt/scielo.php?script=sci_abstract&pid=S0870-11642009000400003&lng=en&nrm=iso&tlng=en