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Titolo:
Characterisation of zinc plus cobalt alloy phases obtained by electrodeposition
Autore:
Gomez, E; Alcobe, X; Valles, E;
Indirizzi:
Univ Barcelona, Dept Quim Fis, LCTEM, E-08028 Barcelona, Spain Univ Barcelona Barcelona Spain E-08028 , LCTEM, E-08028 Barcelona, Spain Univ Barcelona, Serv Cientificotecn, E-08028 Barcelona, Spain Univ Barcelona Barcelona Spain E-08028 icotecn, E-08028 Barcelona, Spain
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1-2, volume: 505, anno: 2001,
pagine: 54 - 61
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANOMALOUS DEPOSITION; CHLORIDE BATHS; MORPHOLOGY; ELECTROLYTES; COATINGS;
Keywords:
zinc-cobalt alloys; electrodeposition; X-ray diffraction; stripping; anomalous codeposition;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Valles, E Univ Barcelona, Dept Quim Fis, LCTEM, Marti & Franques 1, E-08028 Barcelona, Spain Univ Barcelona Marti & Franques 1 Barcelona Spain E-08028 Spain
Citazione:
E. Gomez et al., "Characterisation of zinc plus cobalt alloy phases obtained by electrodeposition", J ELEC CHEM, 505(1-2), 2001, pp. 54-61

Abstract

The anomalous codeposition of Zn + Co alloys on vitreous carbon, copper and nickel substrates in a chloride bath was studied. The results indicate that the substrate influences both the initial electrodeposition stages and the alloy formation. For the same electrodeposition conditions, vitreous carbon and copper substrates favour the formation of deposits richer in zinc than those obtained over a nickel substrate. In the stripping analysis of deposits obtained during anomalous codeposition, up to three major oxidation peaks were observed, the two corresponding to the more negative potentials are attributable to the zinc oxidation in the alloy and the more positive one to the oxidation of the remaining porous cobalt matrix of the alloy. Under our experimental conditions, two kinds of deposits have been analysed using X-ray diffraction (XRD). XRD analysis showed that deposits with very low cobalt percentage (less than 3%) and a hexagonal platelet structure had adistorted hcp zinc eta -phase. Polyhedral-grained deposits with between 4 and 10% cobalt were made up of quasi-pure zinc and a Zn + Co gamma -phase of bcc structure. A correlation between the stripping curve and the type of deposit has been found. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 04/04/20 alle ore 21:15:49