Corrosion Inhibition Effect of 4-Hydroxy-N′-[(E)-(1H-indole-2-ylmethylidene)] Benzohydrazide on Mild Steel in Hydrochloric Acid Solution

Table 2

Activation parameters for the corrosion of mild steel in 1 M HCl acid containing different concentrations of HIBH.

Conc. of inhibitor (mM)	(kJ mol^−1)	(kJ mol^−1)	(J mol^−1 K^−1)
0	52.29	49.67	60.80
0.01	50.08	47.47	80.20
0.025	46.42	43.66	83.80
0.05	47.94	45.32	89.70
0.1	51.19	48.58	80.72
0.2	47.26	44.64	94.63
0.4	48.19	45.58	92.53
0.6	48.29	45.68	93.07
0.8	41.63	44.19	101.08