Table 4 Electrochemical impedance characteristics for MS at different 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) | Rs (Ω cm−2) | Rp (Ω cm−2) | n | Cdl (μF cm−2) | %ηE |
|---|---|---|---|---|---|
25 °C | |||||
0 | 7.4 ± 0.03 | 112.3 ± 0.4 | 0.9514 ± 0.001 | 206 | – |
0.01 | 12.2 ± 0.02 | 353.3 ± 1.1 | 0.9704 ± 0.002 | 154 | 68.0 |
20 | 6.5 ± 0.01 | 517.8 ± 2.2 | 0.9872 ± 0.003 | 122 | 78.2 |
35 °C | |||||
0 | 0.94 ± 0.03 | 35.42 ± 3.2 | 0.9364 ± 0.001 | 725 | – |
0.01 | 2.34 ± 0.01 | 117.1 ± 1.8 | 0.9507 ± 0.003 | 118 | 69.7 |
20 | 0.48 ± 0.03 | 170.79 ± 3.2 | 0.9625 ± 0.001 | 76 | 79.3 |
45 °C | |||||
0 | 1.62 ± 0.01 | 19.55 ± 1.8 | 0.9114 ± 0.003 | 863 | – |
0.01 | 0.94 ± 0.03 | 74.48 ± 3.2 | 0.9699 ± 0.001 | 93 | 73.7 |
20 | 1.62 ± 0.01 | 102.5 ± 1.8 | 0.9714 ± 0.003 | 81 | 80.9 |
55 °C | |||||
0 | 1.58 ± 0.01 | 17.12 ± 0.5 | 0.8907 ± 0.001 | 978 | – |
0.01 | 0.94 ± 0.03 | 316.78 ± 3.2 | 0.9799 ± 0.001 | 64 | 94.6 |
20 | 1.62 ± 0.01 | 343.6 ± 1.8 | 0.9814 ± 0.003 | 13 | 95.0 |
