Table 5 Potentiodynamic polarization parameters for MS at diverse temperatures in 5% HCl solution in the absence and presence of varying concentrations of expired Ampicillin drug.
From: Corrosion inhibition of mild steel in hydrochloric acid solution by the expired Ampicillin drug
C (mM) | Ecorr (mV) | βa (mV dec−1) | βc (mV dec−1) | Icorr (μA cm−2) | %ηI |
|---|---|---|---|---|---|
25 °C | |||||
0 | − 474.0 ± 0.01 | 171.6 ± 0.92 | 86.3 ± 0.87 | 286.2 ± 4.6 | – |
0.01 | − 415.1 ± 0.01 | 101.8 ± 0.91 | 77.7 ± 0.65 | 89.3 ± 3.2 | 68.8 |
20 | − 416.3 ± 0.02 | 88.7 ± 0.90 | 74.2 ± 0.98 | 71.2 ± 6.3 | 75.1 |
35 °C | |||||
0 | − 456.7 ± 0.02 | 129.9 ± 0.83 | 98.2 ± 1.1 | 478.4 ± 1.2 | – |
0.01 | − 439.6 ± 0.03 | 125.0 ± 0.78 | 85.1 ± 1.5 | 134.1 ± 4.5 | 71.9 |
20 | − 435.1 ± 0.11 | 125.3 ± 0.56 | 74.6 ± 0.21 | 111 ± 1.1 | 76.7 |
45 °C | |||||
0 | − 483.6 ± 0.21 | 125.4 ± 0.21 | 81.9 ± 0.23 | 495.6 ± 2.1 | – |
0.01 | − 422.1 ± 0.34 | 118.8 ± 0.15 | 79.4 ± 0.45 | 117.1 ± 1.0 | 76.3 |
20 | − 414.6 ± 0.21 | 99.7 ± 0.32 | 64.8 ± 0.67 | 80.2 ± 1.4 | 83.8 |
55 °C | |||||
0 | − 480.8 ± 0.54 | 117.9 ± 0.11 | 93.8 ± 0.43 | 378.1 ± 1.6 | – |
0.01 | − 435.8 ± 0.21 | 81.2 ± 0.22 | 53.9 ± 0.21 | 21.4 ± 0.54 | 94.3 |
20 | − 428.3 ± 0.11 | 100.5 ± 0.24 | 70.6 ± 0.10 | 16.9 ± 0.67 | 95.5 |
