Artigo
Electrochemical studies of copper, copper-aluminium and copper-aluminium-silver alloys: Impedance results in 0.5M NaCl
Registro en:
Electrochimica Acta, v. 40, n. 16, p. 2657-2668, 1995.
0013-4686
10.1016/0013-4686(95)00108-Q
WOS:A1995TA15500012
2-s2.0-0029404603
Autor
Benedetti, Assis Vicente [UNESP]
Sumodjo, P. T. A.
Nobe, K.
Cabot, P. L.
Proud, W. G.
Resumen
The electrochemical behaviour of Cu, Cu-Al and Cu-Al-Ag alloys in aqueous solutions of NaCl (0.5 M, pH = 3.00) was studied by means of voltammetric methods and electrochemical impedance spectroscopy. The surfaces were examined by SEM and EDX analysis. Cu-Al-Ag alloy shows a potentiodynamic behaviour similar to that of the pure copper electrode while the Cu-Al alloy presents some minor differences. In the active dissolution region the electrodes suffer pitting corrosion and in the other potential regions there are the formation of a passivant film with composition depending on the potential. The impedance responses of the electrodes are discussed. An electrodissolution mechanism is proposed and the effect of the alloying elements upon the impedance response and polarisation curves is explained. The main effects are due to the production of copper and silver chlorides and aluminium oxides/ hydroxides at the corroding interface. The addition of Al or (Al + Ag) increases the corrosion resistance of pure copper. © 1995. Department of Chemical Engineering University of California, Los Angeles, CA 90024 Departamento de Química Física Universidad de Barcelona, 08028 Barcelona Departamento de Físico-Química Universidade Estadual Paulista, 14800-900 Araraquara Departamento de Físico-Química Universidade Estadual Paulista, 14800-900 Araraquara
Materias
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Electrochemical studies of copper, copper-aluminium and copper-aluminium-silver alloys: Impedance results in 0.5M NaCl
Benedetti, Assis Vicente; Sumodjo, P. T. A.; Nobe, K.; Cabot, P. L.; Proud, W. G. -
Electrochemical studies of copper, copper-aluminium and copper-aluminium-silver alloys: Impedance results in 0.5M NaCl
University of California; Universidad de Barcelona; Universidade Estadual Paulista (Unesp) (Elsevier B.V., 1995-11-01)The electrochemical behaviour of Cu, Cu-Al and Cu-Al-Ag alloys in aqueous solutions of NaCl (0.5 M, pH = 3.00) was studied by means of voltammetric methods and electrochemical impedance spectroscopy. The surfaces were ...