Adsorption Properties and Inhibition of C38 Steel Corrosion in Hydrochloric Solution by Some Indole Derivates: Temperature Effect, Activation Energies, and Thermodynamics of Adsorption

Table 7

Thermodynamic parameters calculated from IES for the adsorption of indole derivates on C38 steel in 1 M HCl at different temperatures.

Temp. (°C)	Norharmane			Harmane
	Δ𝐺^0ads (kJ mol^−1)	Δ𝐻^0ads (kJ mol^−1)	Δ𝑆^0ads (J mol^−1 K^−1)	Δ𝐺^0ads (kJ mol^−1)	Δ𝐻^0ads (kJ mol^−1)	Δ𝑆^0ads (J mol^−1 K^−1)
25	−18.00			−14.63
35	−14.46	−8.18	20.2	−15.03	−3.94	36
45	−14.50			−15.44
55	−14.90			−15.69