744
M. Ved’ et al.
It is evident that the difference in the surface structure and morphology, equally
as in the phase composition of electrolytic alloys will have an effect on their electrochemical behavior, in particular on the corrosion resistance and catalytic activity
in electrode reactions.
The electrochemical impedance spectra (EIS) of the electrodes coated with ternary
alloys (Figs. 6 and 7) in Nyquist coordinates (Figs. 6a and 7a) reflect the fact that
the systems can be described by the modified Voith equivalent circuit peculiar for
multiphase systems [27, 33]. The above coatings corrosion process is associated
with the formation oxides of alloying metals on the surface. These nonstoichiometric
specimen 1
specimen 2
(a)
(b)
Fig. 6 Nyquist plots (a) and the equivalent circuits (b) for the Co–Mo–W electrode: 1 is for
specimen 1; 2 is for specimen 2 (see Table 1)
Fig. 7 Nyquist plots (a) and
the equivalent circuit (b) for
the Co–Mo–Zr (specimen 3)
and Co–W–Zr (specimen 6)
electrodes
M. Ved’ et al.
It is evident that the difference in the surface structure and morphology, equally
as in the phase composition of electrolytic alloys will have an effect on their electrochemical behavior, in particular on the corrosion resistance and catalytic activity
in electrode reactions.
The electrochemical impedance spectra (EIS) of the electrodes coated with ternary
alloys (Figs. 6 and 7) in Nyquist coordinates (Figs. 6a and 7a) reflect the fact that
the systems can be described by the modified Voith equivalent circuit peculiar for
multiphase systems [27, 33]. The above coatings corrosion process is associated
with the formation oxides of alloying metals on the surface. These nonstoichiometric
specimen 1
specimen 2
(a)
(b)
Fig. 6 Nyquist plots (a) and the equivalent circuits (b) for the Co–Mo–W electrode: 1 is for
specimen 1; 2 is for specimen 2 (see Table 1)
Fig. 7 Nyquist plots (a) and
the equivalent circuit (b) for
the Co–Mo–Zr (specimen 3)
and Co–W–Zr (specimen 6)
electrodes