Research Article
Inhibition Behaviour of Some Isonicotinic Acid Hydrazides on the Corrosion of Mild Steel in Hydrochloric Acid Solution
Table 5
Impedance parameters for corrosion of MS in 0.5 M HCl in the absence and presence of different concentrations of INIMH and INPMH at 30°C.
| Inhibitors | Concentration (in ppm) | (Ω cm2) |
(μF Cm−2) | IE (%) |
| Blank | 0 | 177.5 | 149.60 | — |
| INIMH | 200 | 562.8 | 35.32 | 68.46 | 300 | 759.3 | 27.97 | 76.62 | 400 | 870.7 | 27.17 | 79.61 | 500 | 1192.0 | 23.27 | 85.10 |
| INPMH | 200 | 537.5 | 39.51 | 66.97 | 300 | 645.2 | 33.12 | 72.48 | 400 | 817.2 | 29.62 | 78.27 | 500 | 1081.0 | 27.69 | 83.58 |
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