Page 143 - Corrosion Engineering Principles and Practice

118 C h a p t e r 5 C o r r o s i o n K i n e t i c s a n d A p p l i c a t i o n s o f E l e c t r o c h e m i s t r y 119

80000
R p
R s
Q
60000
Imaginary (Ohm) 40000

20000

0
0 20000 40000 60000 80000 100000 120000
Real (Ohm)
(a)

6 80
70
5
60
Log Z (Ohm) 4 50 Phase angle (°)
40
3
30
20
2
10
1 0
–3 –2 –1 0 1 2 3
Log (Frequency (Hz))
(b)
FIGURE 5.26 (a) Complex plane and (b) Bode plots of simulated data
corresponding to the model circuit in Fig. 5.25(a) where R = 10 Ω, R =
s
p
100 kΩ, and Q decomposes into C = 40 µF and n = 0.8.
dl