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International Journal of Corrosion
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International Journal of Corrosion
/
2020
/
Article
/
Tab 6
/
Research Article
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
)
E
a
(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