256403.fig.007a
(a)
256403.fig.007b
(b)
256403.fig.007c
(c)
Figure 7: Nyquist plot for N80 steel in 15% HCl acid containing various concentrations of (a) AMPT, (b) APT, and (c) ACPT. 0 ppm 50 ppm 100 ppm 150 ppm, and 200 ppm at 303 K.