Table 3 Corresponding fitted parameters of PDP curves and EIS spectra of AZ91 Mg alloy in 3.5 wt% NaCl solution without and with different concentrations of GUE, PDE, TOE at normal temperature.
System | RS (Ω cm2) | Rf (Ω cm2) | Rct (Ω cm2) | CPE (10–6 S sn cm−2) | n | C (10–4 F) | L1 (Ω cm) | RL1 (Ω cm2) | RP (Ω cm2) | ηEIS (%) |
|---|---|---|---|---|---|---|---|---|---|---|
Blank | 27.33 ± 1.23 | 607.36 ± 5.32 | 32.77 ± 2.12 | 9.88 ± 0.12 | 0.91 ± 0.01 | 4.39 ± 0.01 | 1005.5 ± 6.3 | 449.29 ± 2.12 | 263.91 ± 3.12 | − |
GUE-0.5 g/L | 31.36 ± 2.01 | 929.85 ± 7.31 | 27.99 ± 1.81 | 8.04 ± 0.09 | 0.88 ± 0.02 | 7.04 ± 0.02 | 542.7 ± 2.5 | 1147.21 ± 5.94 | 553.35 ± 4.57 | 49.61 |
GUE-1.0 g/L | 27.86 ± 2.99 | 862.35 ± 6.31 | 105.14 ± 3.63 | 7.73 ± 0.07 | 0.90 ± 0.01 | 1.49 ± 0.01 | 934.3 ± 4.2 | 1188.62 ± 6.01 | 533.18 ± 3.72 | 50.66 |
GUE-2.0 g/L | 27.37 ± 1.01 | 1328.12 ± 8.64 | 288.24 ± 2.01 | 9.56 ± 0.15 | 0.88 ± 0.02 | 1.34 ± 0.00 | 1009 ± 4.5 | 2127.54 ± 8.21 | 945.71 ± 4.81 | 71.36 |
GUE-2.5 g/L | 13.69 ± 0.95 | 604.31 ± 3.09 | 46.28 ± 3.06 | 6.88 ± 0.07 | 0.88 ± 0.03 | 3.80 ± 0.01 | 844.2 ± 3.4 | 534.71 ± 3.21 | 307.07 ± 2.07 | 10.33 |
PDE-0.5 g/L | 26.95 ± 1.5 | 1208.54 ± 5.62 | 70.65 ± 3.17 | 7.73 ± 0.07 | 0.90 ± 0.01 | 3.86 ± 0.01 | 840.2 ± 3.6 | 1438.03 ± 5.94 | 703.81 ± 4.28 | 61.14 |
PDE-1.0 g/L | 33.12 ± 2.13 | 1362.64 ± 9.31 | 167.42 ± 3.31 | 9.28 ± 0.14 | 0.89 ± 0.02 | 1.40 ± 0.01 | 1164.3 ± 5.1 | 1810.68 ± 6.31 | 828.99 ± 4.36 | 68.27 |
PDE-2.0 g/L | 38.59 ± 2.64 | 1654.21 ± 9.54 | 380.64 ± 2.13 | 8.37 ± 0.11 | 0.93 ± 0.01 | 1.11 ± 0.00 | 1623.2 ± 5.9 | 4904.53 ± 11.23 | 1476.65 ± 6.33 | 81.71 |
PDE-2.5 g/L | 13.29 ± 0.76 | 731.97 ± 5.83 | 51.25 ± 1.16 | 7.75 ± 0.07 | 0.88 ± 0.01 | 2.85 ± 0.02 | 660.7 ± 2.8 | 587.07 ± 4.21 | 348.81 ± 1.79 | 21.61 |
TOE-0.5 g/L | 44.41 ± 3.03 | 1033.21 ± 6.67 | 120.18 ± 2.12 | 8.76 ± 0.07 | 0.90 ± 0.01 | 4.18 ± 0.02 | 1653.1 ± 6.7 | 1324.83 ± 5.31 | 660.72 ± 2.31 | 57.33 |
TOE-1.0 g/L | 41.63 ± 3.15 | 1310.46 ± 8.95 | 139.12 ± 3.97 | 8.37 ± 0.11 | 0.93 ± 0.01 | 1.80 ± 0.01 | 1371.7 ± 6.1 | 1912.35 ± 6.85 | 824.43 ± 6.21 | 68.09 |
TOE-2.0 g/L | 38.94 ± 2.95 | 1502.47 ± 9.95 | 346.67 ± 2.11 | 6.95 ± 0.07 | 0.88 ± 0.03 | 1.64 ± 0.00 | 2553.8 ± 7.1 | 4013.73 ± 9.31 | 1304.57 ± 9.06 | 79.22 |
TOE-2.5 g/L | 37.89 ± 2.56 | 1514.35 ± 8.91 | 206.18 ± 0.98 | 7.86 ± 0.07 | 0.90 ± 0.01 | 2.09 ± 0.03 | 1177.9 ± 5.1 | 1973.29 ± 5.12 | 956.81 ± 7.35 | 71.38 |
