Table 5.
Comparison of corrosion inhibition efficiency and adsorption isotherm of different drugs in 1 M HCl medium.
| Drug | Optimum concentration (ppm) | Inhibition efficiency at the optimum concentration (%) | Adsorption isotherm | Ref |
|---|---|---|---|---|
| Cefalozin | 500* | 93.9 | Langmuir | 20 |
| Pheniramine | 200* | 86.4 | Langmuir | 23 |
| Streptomycin | 500 | 83.9 | Langmuir | 24 |
| Analgin | 4000 | 92.47 | Langmuir | 21 |
| Metformin hydrochloride | 500 | 83.97 | Langmuir | 25 |
| Penicilin G | 3350* | 95.9 | Langmuir | 26 |
| Ampicilin | 3500* | 95.5 | Langmuir | 26 |
| Amoxicilin | 3650* | 93.7 | Langmuir | 26 |
| Cefalexin | 400 | 90 | Langmuir | 27 |
| Losartan potassium | 2300* | 88.9 | Langmuir | 19 |
| Ketosulfone | 200 | 77.7 | Langmuir | 28 |
| Cefixime | 400* | 91.8 | Langmuir | 29 |
| Atorvastatin | 150 | 96.38 | Langmuir | 30 |
| Pantoprazole sodium | 300 | 92.2 | Langmuir | 32 |
| Ondansetron hydrochloride | 300 | 88.56 | Langmuir | 33 |
| Betahistine dihydrochloride | 1500 | 96.21 | Langmuir | 68 |
| Isoxsuprine hydrochloride | 2000 | 97.83 | Langmuir | 69 |
| Diphenhydramine hydrochloride (DPH) | 1000 | 93.86 | Langmuir | Present study |
*The concentration of these compounds is converted from mM to ppm.