Identification of corrosion products on a medieval copper-silver coin

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

C. M. B. Martins (Autor) FEUP; José Inácio Martins (Autor) FEUP

Revista

Título: Protection Of Metals And Physical Chemistry Of Surfaces

Vol. 47 Nº 1

Páginas: 128-132

ISSN: 2070-2051

Editora: Pleiades Publishing

Indexação

ISI Web of Knowledge - 10 Citações

ISI Web of Science

Scopus - 13 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

Outras Informações

ID Authenticus: P-002-XSP

DOI: 10.1134/s2070205110061012

Abstract (EN): This work relates a study on a medieval coin found during archaeological works carried out at the site of Senhora do Castelo in Urros (Torre de Moncorvo, Portugal). The artefact has been identified as a coin of D. Afonso IX of Leon (1155-1188). The substratum showed composition typical of bullion, Cu-Ag (30-33%) with minor elements (1% Pb + 0.2% Sn + 0.4% Zn). The corrosion products developed on the coin during the archaeological burial was studied 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). The results show the presence of cuprite, atacamite, chalcocite, native silver, silver oxide and silver sulphide on the outer layers of the coin, which allows deducing the importance of the environment in the corrosion phenomena.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 5