Table 2. Fitted EIS parameters using the EEC model in Fig. 5 for uncoated and 3CHI3DCF- or 3CHI2DCF-coated AISI 316LVM stainless steel in physiological solution after 1 h, 3 h, 5 h, 7 h, and 10 h of immersion.
Immersion time [h] | χ2 | RΩ | Q1 | n1 | R1 | C1 | Q2 | n2 | R2 | C2 | W |
---|---|---|---|---|---|---|---|---|---|---|---|
Uncoated sample | |||||||||||
1 | 0.69 | 25.08 | 41.11 | 0.92 | 28.46 | 40.21 | 98.28 | 1.00 | 262.06 | 98.28 | 21.03 |
3 | 0.05 | 25.93 | 36.13 | 0.92 | 11.19 | 31.96 | 54.68 | 0.99 | 584.46 | 56.24 | 15.01 |
5 | 0.03 | 26.37 | 34.48 | 0.92 | 13.57 | 30.97 | 44.19 | 0.97 | 861.78 | 50.69 | 14.40 |
7 | 0.02 | 26.60 | 33.34 | 0.92 | 14.12 | 29.67 | 40.46 | 0.95 | 1116.14 | 49.53 | 13.68 |
10 | 0.02 | 26.82 | 32.13 | 0.92 | 15.04 | 28.68 | 38.26 | 0.94 | 1461.80 | 48.80 | 12.93 |
3CHI3DCF-coated sample | |||||||||||
1 | 0.68 | 24.96 | 50.57 | 0.91 | 51.86 | 55.80 | 92.29 | 1.00 | 245.00 | 92.29 | 15.66 |
3 | 0.23 | 25.63 | 44.18 | 0.91 | 95.68 | 50.73 | 93.10 | 0.99 | 519.00 | 93.77 | 9.25 |
5 | 0.03 | 26.05 | 41.31 | 0.91 | 98.68 | 47.23 | 110.23 | 0.93 | 788.55 | 116.67 | 7.79 |
7 | 0.02 | 26.25 | 39.56 | 0.92 | 109.79 | 45.44 | 88.85 | 0.93 | 973.90 | 96.34 | 7.26 |
10 | 0.03 | 26.53 | 37.52 | 0.92 | 122.77 | 43.18 | 109.03 | 0.79 | 1475.50 | 840.05 | 7.17 |
3CHI2DCF-coated sample | |||||||||||
1 | 0.52 | 25.14 | 41.31 | 0.89 | 23.49 | 40.54 | 71.00 | 1.00 | 351.30 | 71.00 | 15.60 |
3 | 0.22 | 25.96 | 34.51 | 0.89 | 28.50 | 34.11 | 56.45 | 1.00 | 716.40 | 56.45 | 10.89 |
5 | 0.23 | 26.42 | 32.31 | 0.89 | 30.85 | 32.10 | 54.81 | 0.93 | 1107.50 | 67.03 | 9.28 |
7 | 0.01 | 26.61 | 31.68 | 0.89 | 33.67 | 31.97 | 47.28 | 0.86 | 1370.00 | 70.62 | 11.10 |
10 | 0.26 | 26.89 | 29.69 | 0.89 | 47.29 | 30.83 | 42.12 | 0.74 | 2277.50 | 180.30 | 10.73 |
Units: χ2 [×10−3], RΩ [Ω cm2], R1 and R2 [kΩ cm2], Q1 and Q2 [μΩ−1 cm−2 sn], W [μΩ−1 cm−2 s1/2]; C [μF cm−2] was calculated as Cx = (RxQx)nx/Rx.