Table 5 Tafel analysis of polarization curves of carbon steel in the control and treated samples after different exposure times.
Treatment | Time (hr) | icorr (μA/cm2) | Ecorr (mV) vs. SCE | βa (mV/dec) | − βc (mV/dec) | Corrosion rate (mpy) |
|---|---|---|---|---|---|---|
Control | 24 | 46.9 | − 786 | 272 | 231 | 20.9 |
48 | 10.5 | − 755 | 214 | 119 | 4.6 | |
72 | 5.2 | − 747 | 237 | 104 | 2.3 | |
Treated (160 ppm THPS) | 24 | 55.6 | − 829 | 292 | 153 | 25.7 |
48 | 48.3 | − 793 | 278 | 164 | 22.3 | |
72 | 13.4 | − 784 | 306 | 172 | 6.2 |
