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Depletion and enrichment of an alloy surface

Tipo di pubblicazione: Articolo su rivista
Tipologia MIUR: Contributo su Rivista > Articolo in rivista
Titolo: Depletion and enrichment of an alloy surface
Autori: A.C. Sparavigna
Autori di ateneo:
Titolo del periodico: ARCHAEOGATE
Tipo di referee: Tipo non specificato
Editore: I.I.C.E., Torino
Volume: 2013
Numero: 22-01
ISSN: 1973-2953
Abstract: In studying the ancient objects made of noble metal alloys, such as gold with copper or silver, the phenomenon of surface enrichment is often encountered [1]. This phenomenon is regarding the composition changes of the surfaces, changes that happen because objects had been buried for a long time. In fact, this alteration of surfaces is not due to their enrichment, that is, to an addition of gold, but it is due to a depletion process, during which the less chemically stable elements leach out slowly, causing the surface composition to change. It is the same for gilding; we can have an enrichment of the surface when gold is added to it, or a depletion of the surface when other elements of the alloy are removed and the local percentage of gold is increased as a consequence. Therefore, an ancient object can have a surface rich of gold because of time or because of an ancient depletion gilding treatment. This depletion gilding was used by pre-Columbian populations for the tumbaga, a gold and copper alloy, to give it the luster of gold
Data: 2013
Status: Pubblicato
Lingua della pubblicazione: Inglese
Parole chiave: archaeological artefacts, chimu, archaeology, depletion gilding, el dorato, gold copper alloy, tumbaga, alloys, gold silver copper alloys
Dipartimenti (originale): DISAT - Dipartimento Scienza Applicata e Tecnologia
Dipartimenti: DISAT - Dipartimento Scienza Applicata e Tecnologia
URL correlate:
    Area disciplinare: Area 02 - Scienze fisiche > FISICA SPERIMENTALE
    Data di deposito: 23 Gen 2013 09:24
    Data ultima modifica (IRIS): 31 Ago 2014 19:06:02
    Data inserimento (PORTO): 12 Gen 2015 17:30
    Permalink: http://porto.polito.it/id/eprint/2505617
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