Marjoram Extract as Corrosion Inhibitor for Dissolution of Zinc in 1.0 M HCl

Table 5

Activation parameters of the dissolution reaction of zinc in 1.0 M HCl in the absence and presence of 500 ppm of marjoram extract.

System	𝐸𝑎 (kJ mol^−1)	Δ𝐻^∗ (kJ mol^−1)	Δ𝑆^∗ (J mol^−1)
1.0 M HCl	9.83	16.12	−209.35
1.0 M HCl + 500 ppm inhibitor	13.18	23.20	−213.40