Electrochemical and Surface Morphological Studies of Carbon Steel Corrosion by a Novel Polynuclear Schiff Base in HCl Solution

Table 2

Thermodynamic parameters of corrosion of CS in 1 M HCl with and without the inhibitor A9Y5GPA.

𝐶 (mM)	𝐸𝑎 (kJ mol^−1)	𝐴	Δ𝐻^∗ (kJ mol^−1)	Δ𝑆^∗ (J mol^−1 K^−1)
Blank	47.73	1.1×10^9	45.09	−80.44
0.2	69.89	3.9×10^12	67.24	−12.68
0.4	78.90	1.2×10^14	76.24	15.47
0.6	81.29	2.4×10^14	78.63	21.64
0.8	87.31	2.2×10^15	84.64	39.83
1.0	91.02	8.2×10^15	88.36	50.95