Effect of Temperature on the Corrosion Inhibition of Trans-4-Hydroxy-4^′-Stilbazole on Mild Steel in HCl Solution

Table 2

The activation energy (𝐸_a) for the corrosion of mild steel in 1 M HCl with and without trans-4-hydroxy-4′-stilbazole inhibitor at various concentrations.

System	Activation energy, 𝐸a (kcal·mol^−1)
	1 × 10^−3M	1 × 10^−4M	1 × 10^−5M	1 × 10^−6M	1 × 10^−7M
1 M HCl	18.27	18.27	18.27	18.27	18.27
1 M HCl+trans-4-hydroxy-4′-stilbazole	26.93	26.82	19.72	18.76	18.93