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

Table 8

Thermodynamic parameters calculated from LP 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	−14.59			−14.71
35	−14.84	−8.45	20.7	−15.04	−7.43	24.5
45	−15.06			−15.23
55	−15.21			−15.46