Research Article
Inhibition Behaviour of Some Isonicotinic Acid Hydrazides on the Corrosion of Mild Steel in Hydrochloric Acid Solution
Table 2
Activation parameters for MS in 0.5 M HCl medium in the absence and presence of INIMH and INPMH at 500 ppm.
| Inhibitor | Concentration (ppm) | (kJ mol−1) | (mg cm−2 h−1) | (kJ mol−1) | (kJ mol−1) | (J mol−1 K−1) |
| Blank | 0 | 19.003 | 1374.041 | 16.365 | 16.484 | −197.574 |
| INIMH | 200 | 23.455 | 2570.396 | 20.813 | 20.936 | −188.498 | 300 | 24.355 | 3076.096 | 21.713 | 21.836 | −187.005 | 400 | 26.748 | 5357.966 | 24.106 | 24.229 | −182.391 | 500 | 27.457 | 5610.479 | 24.815 | 24.937 | −182.027 |
| INPMH | 200 | 23.282 | 2483.133 | 20.659 | 20.763 | −188.785 | 300 | 24.087 | 2890.679 | 21.464 | 21.568 | −187.522 | 400 | 26.519 | 5128.613 | 23.876 | 23.999 | −182.754 | 500 | 27.093 | 5211.947 | 24.470 | 24.574 | −182.620 |
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