Figure 7

EIS plots for API 5 L X60 steel in CO2 saturated 3.5% NaCl with and without 50 ppm TBA at 25 °C and pH 4 (a) Nyquist for blank (b) Nyquist for 50 ppm TBA (c) phase angle for blank (d) phase angle for 50 ppm TBA at different immersion times.

EIS plots for API 5 L X60 steel in CO2 saturated 3.5% NaCl with and without 50 ppm TBA at 25 °C and pH 4 (a) Nyquist for blank (b) Nyquist for 50 ppm TBA (c) phase angle for blank (d) phase angle for 50 ppm TBA at different immersion times.