Research Article
Corrosion Inhibition and Adsorption Properties of Ethanolic Extract of Calotropis for Corrosion of Aluminium in Acidic Media
Table 8
Thermometric reaction for aluminium in 4 N and 5 N sulphuric acid with ethanolic extract of leaves, latex, and fruit of Calotropis gigantea.
| Inhibitor concentration | Reaction number (RN) 4 N | Inhibition efficiency (%) | Reaction number (RN) 5 N | Inhibition efficiency (%) |
| Uninhibited | 2.48 | | 3.10 | | Leaves | | | | | 0.12 | 1.57 | 37.43 | 2.24 | 28.83 | 0.24 | 1.54 | 38.37 | 2.03 | 35.33 | 0.36 | 1.48 | 41.47 | 1.95 | 37.21 | 0.48 | 1.01 | 59.61 | 1.66 | 50.48 | 0.60 | 0.88 | 64.87 | 1.22 | 60.75 | Latex | | | | | 0.12 | 1.48 | 42.19 | 2.36 | 25.21 | 0.24 | 1.37 | 45.34 | 2.14 | 31.37 | 0.36 | 1.24 | 50.52 | 2.08 | 32.89 | 0.48 | 1.09 | 56.54 | 1.82 | 42.56 | 0.60 | 0.91 | 62.83 | 1.46 | 53.19 | Fruit | | | | | 0.12 | 1.43 | 41.77 | 2.10 | 32.57 | 0.24 | 1.33 | 44.81 | 1.95 | 37.22 | 0.36 | 1.21 | 51.83 | 1.81 | 43.39 | 0.48 | 1.06 | 58.17 | 1.55 | 51.43 | 0.60 | 0.82 | 67.05 | 1.17 | 62.26 |
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