Table 4 Electrochemical parameters obtained from the polarization curves of AZ91 Mg alloy in 3.5 wt% NaCl solution without and with different concentrations of GUE, PDE, TOE at normal temperature.
System | βa (mV/dec) | βc (mV/dec) | −Ecorr (mV) | Icorr (μA cm−2) | ηIcorr (%) |
|---|---|---|---|---|---|
Blank | 223 ± 12 | 196.9 ± 9.6 | 1565 ± 9 | 104.69 ± 3.22 | – |
GUE-0.5 g/L | 183.3 ± 7.9 | 132.3 ± 5.6 | 1544 ± 7 | 62.56 ± 1.34 | 40.24 |
GUE-1.0 g/L | 143.8 ± 5.1 | 167 ± 6 | 1553 ± 4 | 55.34 ± 1.02 | 47.14 |
GUE-2.0 g/L | 124.4 ± 6.2 | 89.3 ± 3.9 | 1542 ± 3 | 27.85 ± 0.97 | 73.40 |
GUE-2.5 g/L | 153.3 ± 9.1 | 153.3 ± 5.9 | 1552 ± 4 | 84.32 ± 2.83 | 19.46 |
PDE-0.5 g/L | 147.9 ± 7.6 | 120.9 ± 7.1 | 1573 ± 9 | 41.03 ± 1.85 | 60.81 |
PDE-1.0 g/L | 136.7 ± 3.3 | 151.9 ± 4.7 | 1540 ± 6 | 34.65 ± 0.77 | 66.90 |
PDE-2.0 g/L | 76.3 ± 2.1 | 95 ± 7 | 1520 ± 5 | 13.01 ± 0.13 | 87.57 |
PDE-2.5 g/L | 146.3 ± 6.3 | 153.9 ± 6.4 | 1552 ± 7 | 75.32 ± 2.16 | 28.05 |
TOE-0.5 g/L | 139.3 ± 4.9 | 161.4 ± 8.1 | 1554 ± 6 | 50.69 ± 1.67 | 51.58 |
TOE-1.0 g/L | 175 ± 6 | 169.8 ± 5.8 | 1562 ± 5 | 43.75 ± 1.15 | 58.21 |
TOE-2.0 g/L | 97.9 ± 2.9 | 71.7 ± 6.5 | 1529 ± 7 | 16.13 ± 0.27 | 84.59 |
TOE-2.5 g/L | 139.2 ± 3.1 | 161.1 ± 3.3 | 1548 ± 5 | 33.75 ± 1.03 | 67.76 |
