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Titolo:
XPS and electrochemical characterization of tarnish films on dental alloys
Autore:
Angelini, E; Cordano, E; Kaciulis, S; Mattogno, G; Pandolfi, L; Pinasco, MR; Rosalbino, F;
Indirizzi:
Politecn Turin, Dept Mat Sci & Chem Engn, I-10129 Turin, Italy Politecn Turin Turin Italy I-10129 Sci & Chem Engn, I-10129 Turin, Italy Univ Genoa, Dept Chem & Ind Chem, I-16146 Genoa, Italy Univ Genoa Genoa Italy I-16146 ept Chem & Ind Chem, I-16146 Genoa, Italy CNR, Inst Mat Chem, I-00016 Monterotondo Scalo, Rome, Italy CNR Monterotondo Scalo Rome Italy I-00016 Monterotondo Scalo, Rome, Italy
Titolo Testata:
SURFACE AND INTERFACE ANALYSIS
fascicolo: 1, volume: 30, anno: 2000,
pagine: 50 - 55
SICI:
0142-2421(200008)30:1<50:XAECOT>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
GOLD;
Keywords:
tarnish; corrosion; dental alloys; XPS; microscopy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Angelini, E Politecn Turin, Dept Mat Sci & Chem Engn, Corso Duca Abruzzi 24, I-10129 Turin, Italy Politecn Turin Corso Duca Abruzzi 24 Turin Italy I-10129 taly
Citazione:
E. Angelini et al., "XPS and electrochemical characterization of tarnish films on dental alloys", SURF INT AN, 30(1), 2000, pp. 50-55

Abstract

Three gold resin casting alloys ranging in nobility between 30 and 74 wt.%have been analysed by XPS, SEM plus energy-dispersive spectroscopy (EDS) as well as by L*a*b* colorimetry before and after in vitro tarnishing in 0.1M Na2S solution with a rotating wheel apparatus. The lower the nobility ofthe alloy, the higher the tarnishing tendency: the alloys appear darker with increased redness and yellowness, as determined by colorimetric analysis. On the three alloys, corrosion products of almost the same chemical composition are detected in different amounts. The products are mainly Cu (53-57 wt,%), S (23-29 wt.%) and Ag (similar to 4 wt.%), as determined by EDS, X-ray photoelectron spectroscopy analysis carried out in the first tarnishing steps indicates more sulphur enrichment on the surfaces of the alloys with the lower nobility. Auger maps of the tarnished surfaces show evidence of the onset of a selective reaction of sulphur with Cu and Ag in the first steps. The electrochemical results are in accordance with the previously exposed data: the polarization curves recorded on alloys with increasing Ag and Cu amounts show higher current density values indicating a worse performance. Copyright (C) 2000 John Wiley & Sons, Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 21:22:11