A Characteristic Investigation of Aminocyclohexane-N′-methylurea as a Corrosion Inhibitor for Mild Steel in 1 N H₂SO₄

Table 3

Calculated values of activation energy (𝐸_𝑎) and free energy of adsorption (Δ𝐺_ads) for mild steel in 1 N H₂SO₄ with ACMU.

Concentration of ACMU (N)	Energy of activation (𝐸𝑎) KJ/mole			Free energy change (Δ𝐺ads) KJ/mole
	303–318 K	318–333 K	303–333 K	303 K	318 K	333 K
Blank	64.84	103.08	83.06	28.31	28.90	29.58
0.001	73.70	109.85	90.92	25.21	25.74	26.80
0.005	74.05	105.10	88.84	23.99	24.87	25.64
0.010	69.21	108.78	88.06	24.02	24.43	25.03
0.015	76.79	111.44	93.30	24.23	24.77	24.62
0.020	75.92	124.55	99.09	28.31	28.90	29.58