Electrochemical and Thermodynamic Investigation on Corrosion Inhibition of C38 Steel in 1M Hydrochloric Acid Using the Hydro-Alcoholic Extract of Used Coffee Grounds

Table 6

Thermodynamic parameters.

Concentration	(kJ.mol^−1)	(J.mol^−1)	Ea (kJ/mol)
Blank	32.51	83.36	35.07
0.25 g/L	41.48	72.39	44.03
0.5 g/L	43.02	68.76	45.57
1 g/L	43.81	66.87	46.36
1.5 g/L	57.81	25.51	60.36
2 g/L	59.04	22.43	61.59