Baphia nitida Leaves Extract as a Green Corrosion Inhibitor for the Corrosion of Mild Steel in Acidic Media

Table 6

Calculated values of apparent activation energy (𝐸_𝑎) and preexponential factor (𝐴) for mild steel corrosion in 1 M H₂SO₄ and 2 M HCl with BN extract as inhibitor.

𝐶 (mg/L)	𝐸𝑎 (kJ/mol)	𝐴 (mg/cm^2 h)	𝑅^2
1 M H2SO4
0	40.97	2.02×10^7	0.950
5	54.30	1.79×10^9	0.974
10	55.55	2.78×10^9	0.980
20	56.81	4.26×10^9	0.984
40	59.40	1.05×10^10	0.989
60	62.24	2.87×10^10	0.992
80	63.39	4.13×10^10	0.992
100	64.72	6.44×10^10	0.992
2 M HCl
0	32.75	6.06×10^5	0.951
5	49.44	1.26×10^8	0.988
10	50.66	1.87×10^8	0.992
20	54.11	6.24×10^8	0.994
40	60.12	5.22×10^9	0.992
60	63.84	1.87×10^10	0.989
80	69.26	1.28×10^11	0.987
100	77.82	2.82×10^12	0.979