Characterisation of five coins from the archaeological heritage of Portugal
Autor(a) principal: | |
---|---|
Data de Publicação: | 2010 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10174/5096 |
Resumo: | This paper reports a study carried out on three Roman and two Portuguese coins found in the archaeological site of São Pedro, in Fronteira (Alentejo, Portugal). The three Roman coins have been identified as a Follis, an AE 2 and an AE 3 (bronze alloys), while the Portuguese coins have been identified as a Ceitil (copper) and the “6 vinténs” (Ag–Cu alloy). Scanning electron microscopy (SEM) coupled to energy dispersive spectroscopy (EDS) has allowed the semi-quantitative determination of the elemental composition of both the corrosion products and the alloy used in the manufacture of the coins. The crystalline corrosion products constituents of the patinas were identified by X-ray powder diffraction spectroscopy (XRD). The more deteriorated coin, the AE 3, was submitted to electrochemical studies in Na2SO4 aqueous solution and the corresponding data analysed. After 3 weeks, the E OCP was still quite stable, ranging between −0.050 and −0.070 V vs. SCE; the corrosion resistance, R p, was of the order of 5 to 3 × 103 Ω. Chemical treatment of the sample by 1-h immersion in 0.1 M NaOH produced a more active surface, with R p showing a decrease of a factor of about ten. On the other hand, it was concluded from voltammetric data that polarisations of E a ≥ 0.050 V vs. SCE led to copper oxidation, with no reduction of the other corrosion products. |
id |
RCAP_0067fe4189a5fc296504f098b3782949 |
---|---|
oai_identifier_str |
oai:dspace.uevora.pt:10174/5096 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
spelling |
Characterisation of five coins from the archaeological heritage of PortugalElectroquímicaNumismáticaArqueologiaThis paper reports a study carried out on three Roman and two Portuguese coins found in the archaeological site of São Pedro, in Fronteira (Alentejo, Portugal). The three Roman coins have been identified as a Follis, an AE 2 and an AE 3 (bronze alloys), while the Portuguese coins have been identified as a Ceitil (copper) and the “6 vinténs” (Ag–Cu alloy). Scanning electron microscopy (SEM) coupled to energy dispersive spectroscopy (EDS) has allowed the semi-quantitative determination of the elemental composition of both the corrosion products and the alloy used in the manufacture of the coins. The crystalline corrosion products constituents of the patinas were identified by X-ray powder diffraction spectroscopy (XRD). The more deteriorated coin, the AE 3, was submitted to electrochemical studies in Na2SO4 aqueous solution and the corresponding data analysed. After 3 weeks, the E OCP was still quite stable, ranging between −0.050 and −0.070 V vs. SCE; the corrosion resistance, R p, was of the order of 5 to 3 × 103 Ω. Chemical treatment of the sample by 1-h immersion in 0.1 M NaOH produced a more active surface, with R p showing a decrease of a factor of about ten. On the other hand, it was concluded from voltammetric data that polarisations of E a ≥ 0.050 V vs. SCE led to copper oxidation, with no reduction of the other corrosion products.2012-04-24T10:06:57Z2012-04-242010-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/5096http://hdl.handle.net/10174/5096engAna L. Mata, André Carneiro, M. Manuel M. Neto, Luís A. Proença, M. Manuela L. Salta, M. Helena Mendonça and Inês Teodora Elias Fonseca,Characterisation of five coins from the archaeological heritage of Portugal,JOURNAL OF SOLID STATE ELECTROCHEMISTRY Volume 14, Number 3 (2010), 495-503.http://www.springerlink.com/content/b814m331071ru307/abstract/ampc@uevora.ptndndndndndnd435Carneiro, AndréMata, Ana LeonorNeto, M. ManuelProença, LuísSalta, ManuelaMendonça, HelenaFonseca, Inêsinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T18:43:29Zoai:dspace.uevora.pt:10174/5096Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:00:09.067163Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Characterisation of five coins from the archaeological heritage of Portugal |
title |
Characterisation of five coins from the archaeological heritage of Portugal |
spellingShingle |
Characterisation of five coins from the archaeological heritage of Portugal Carneiro, André Electroquímica Numismática Arqueologia |
title_short |
Characterisation of five coins from the archaeological heritage of Portugal |
title_full |
Characterisation of five coins from the archaeological heritage of Portugal |
title_fullStr |
Characterisation of five coins from the archaeological heritage of Portugal |
title_full_unstemmed |
Characterisation of five coins from the archaeological heritage of Portugal |
title_sort |
Characterisation of five coins from the archaeological heritage of Portugal |
author |
Carneiro, André |
author_facet |
Carneiro, André Mata, Ana Leonor Neto, M. Manuel Proença, Luís Salta, Manuela Mendonça, Helena Fonseca, Inês |
author_role |
author |
author2 |
Mata, Ana Leonor Neto, M. Manuel Proença, Luís Salta, Manuela Mendonça, Helena Fonseca, Inês |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Carneiro, André Mata, Ana Leonor Neto, M. Manuel Proença, Luís Salta, Manuela Mendonça, Helena Fonseca, Inês |
dc.subject.por.fl_str_mv |
Electroquímica Numismática Arqueologia |
topic |
Electroquímica Numismática Arqueologia |
description |
This paper reports a study carried out on three Roman and two Portuguese coins found in the archaeological site of São Pedro, in Fronteira (Alentejo, Portugal). The three Roman coins have been identified as a Follis, an AE 2 and an AE 3 (bronze alloys), while the Portuguese coins have been identified as a Ceitil (copper) and the “6 vinténs” (Ag–Cu alloy). Scanning electron microscopy (SEM) coupled to energy dispersive spectroscopy (EDS) has allowed the semi-quantitative determination of the elemental composition of both the corrosion products and the alloy used in the manufacture of the coins. The crystalline corrosion products constituents of the patinas were identified by X-ray powder diffraction spectroscopy (XRD). The more deteriorated coin, the AE 3, was submitted to electrochemical studies in Na2SO4 aqueous solution and the corresponding data analysed. After 3 weeks, the E OCP was still quite stable, ranging between −0.050 and −0.070 V vs. SCE; the corrosion resistance, R p, was of the order of 5 to 3 × 103 Ω. Chemical treatment of the sample by 1-h immersion in 0.1 M NaOH produced a more active surface, with R p showing a decrease of a factor of about ten. On the other hand, it was concluded from voltammetric data that polarisations of E a ≥ 0.050 V vs. SCE led to copper oxidation, with no reduction of the other corrosion products. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-01-01T00:00:00Z 2012-04-24T10:06:57Z 2012-04-24 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10174/5096 http://hdl.handle.net/10174/5096 |
url |
http://hdl.handle.net/10174/5096 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Ana L. Mata, André Carneiro, M. Manuel M. Neto, Luís A. Proença, M. Manuela L. Salta, M. Helena Mendonça and Inês Teodora Elias Fonseca,Characterisation of five coins from the archaeological heritage of Portugal,JOURNAL OF SOLID STATE ELECTROCHEMISTRY Volume 14, Number 3 (2010), 495-503. http://www.springerlink.com/content/b814m331071ru307/abstract/ ampc@uevora.pt nd nd nd nd nd nd 435 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
_version_ |
1799136483886497792 |