An Investigation of a Combined Thiourea and Hexamethylenetetramine as Inhibitors for Corrosion of N80 in 15% HCl Solution: Electrochemical Experiments and Quantum Chemical Calculation

Table 3

Electrochemical parameters calculated from EIS measurements on N80 electrode in 15% HCl solution for different corrosion inhibitor concentrations at 25 ± 1°C.

Sample (M)	(Ω cm^2)	(S  cm^−2)	()	(Ω cm^2)	(S  cm^−2)	()	(Ω cm^2)
HCl	0.9203	0.0002918	0.9054	32.25	0.0003987	0.8785	3.943
0.0001	5.235	0.0004901	0.8346	11.29	0.0001136	1	59.84	0.934
0.001	1.175	0.0000483	0.929	239.5	0.0005603	0.9017	123.3	0.968
0.01	1.307	0.0003884	0.9332	94.47	0.0000725	0.9408	143.6	0.973
0.1	1.884	0.0003417	0.9068	136.4	0.00004803	0.9515	210.4	0.981