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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/130642
Title: 
Potentiodynamic behaviour of CuA1Ag alloys in NaOH: a comparative study related to the pure metals electrochemistry
Author(s): 
Institution: 
  • Universidade de São Paulo (USP)
  • UNIV BARCELONA
  • Universidade Estadual Paulista (UNESP)
ISSN: 
0013-4686
Abstract: 
The mechanism of electrochemical oxidation of surface reformed CuA1Ag alloys having different composition of heat treatment, in 0.5 M NaOH was studied by means of cyclic polarization, constant potential electrolysis, ICP, AA, SEM and EDX. The surface reformation consisted of a repetitive triangular potential sweep (RTPS) between H 2 and O 2 evolution at 100 mV s -1 in the working solution itself, performed in order to increase the electrode roughness and obtain a quasi-stationary I/E profile in which the potentiodynamic behaviour of copper and silver was clearly revealed. The alloys suffer aluminum dealloying after such an RTPS. The quasi-stationary cyclic polarization curve exhibits a multiplicity of current peaks which have been related to the electrochemical reactions involving the pure alloying elements. Complex potential perturbation programmes in regions having different anodic and cathodic limits allowed the study of the mechanism of the electrochemical oxidation of the surface reformed alloys and the compare with that corresponding to the pure metals. The basic differences between the electro-oxidation processes of the surface reformed CuA1Ag alloys with respect to those established for the high purity alloying metals are the splitting of the peaks corresponding to the formation of the Cu(I) and Ag(I) species. © 1991.
Issue Date: 
1-Dec-1991
Citation: 
Electrochimica Acta. Oxford: Pergamon-Elsevier B.V., v. 36, n. 9, p. 1409-1421, 1991.
Time Duration: 
1409-1421
Publisher: 
Elsevier B.V.
Keywords: 
  • oxidation state
  • potentiodynamic
  • ternary copper alloy
Source: 
http://dx.doi.org/10.1016/0013-4686(91)85327-4
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/130642
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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