UAE Neem Extract as a Corrosion Inhibitor for Carbon Steel in HCl Solution

Table 5

The activation energy (𝐸_𝑎) for the corrosion of carbon steel in 1.0 M HCl with and without the aqueous extract of Neem leaves at various concentrations.

System	Activation Energy, 𝐸𝑎 (kcal⋅mol^-1)
	2.00 g/L	1.00 g/L	0.50 g/L	0.20 g/L	0.02 g/L
1.0 M HCl	18.27	18.27	18.27	18.27	18.27
1.0 M HCl + The Aqueous Extract of Neem Leaves	25.96	25.42	25.43	24.88	22.15