Table 6. Impedance Parameters for Q235 Steel in 1 M HCl in the Presence and Absence of Different Concentrations of [1,8-Nap][CETSA].

medium	Rs (Ω cm2)	Rct (Ω cm2)	Cdl (μF·cm–2)	n	η (%)
blank	0.83 ± 0.033	13.21 ± 0.9	406.81	0.80 ± 0.04
0.1	0.71 ± 0.020	146.5 ± 1.6	175.73	0.70 ± 0.03	91.16
1	0.73 ± 0.0091	188.7 ± 2.0	162.33	0.70 ± 0.03	92.99
2.5	0.70 ± 0.03	185.2 ± 1.1	159.02	0.71 ± 0.01	92.86
5	0.67 ± 0.015	168.6 ± 2.8	136.14	0.70 ± 0.02	92.16