Table 3 EIS parameters of carbon steel coupons in treated and control samples.
Treatment | Time (hr) | Rs (Ω cm2) | Yb (Ω−1 cm−2 sn) | nb | Rb (Ω cm2) | Ydl (Ω−1 cm−2 sn) | ndl | Rct (Ω.cm2) | Ceff (µf.cm-2) | Goodness of fit (χ2) |
|---|---|---|---|---|---|---|---|---|---|---|
Control | 24 | 6.70 ± 0.81 | 0.000342 ± 0.000048 | 0.8397 ± 0.0121 | 8.74 ± 1.61 | 0.000491 ± 0.000023 | 0.8977 ± 0.0261 | 1429 ± 108 | 255.8 | 0.0013 |
48 | 3.99 ± 0.33 | 0.000081 ± 0.000004 | 0.8496 ± 0.0161 | 24.78 ± 5.32 | 0.000265 ± 0.000037 | 0.9171 ± 0.0117 | 3350 ± 216 | 142.6 | 0.0017 | |
72 | 13.85 ± 1.27 | 0.000261 ± 0.000021 | 0.8236 ± 0.0141 | 5.76 ± 0.9 | 0.000164 ± 0.000043 | 0.8683 ± 0.0109 | 5627 ± 301 | 65.1 | 0.0012 | |
Treated (160 ppm THPS) | 24 | 13.13 ± 1.52 | 0.000419 ± 0.000028 | 0.9641 ± 0.0203 | 4.90 ± 0.7 | 0.001233 ± 0.000116 | 0.8097 ± 0.0102 | 934 ± 62 | 466 | 0.0021 |
48 | 10.27 ± 0.77 | 0.000427 ± 0.000034 | 0.9721 ± 0.0186 | 8.66 ± 1.73 | 0.000623 ± 0.000218 | 0.8023 ± 0.0037 | 1238 ± 81 | 179.1 | 0.0015 | |
72 | 12.80 ± 0.91 | 0.000413 ± 0.000128 | 0.9708 ± 0.0174 | 10.23 ± 1.89 | 0.000481 ± 0.000086 | 0.7952 ± 0.0104 | 5240 ± 254 | 129.6 | 0.0011 |
