Table 8.

Parameters gained from EIS in 1.0 M HCl and with the addition of doses of the investigated additives

Inhibitor	Conc., M	Yo, µΩ−1 sn cm−2	n	Rct, Ω cm2	Cdl, μF cm−2	θ	η EIS	Goodness of fit (χ2)
HM-1223	1.0 mol Lˉ1	996	0.999	16 ± 0.1925	992 ± 0.1925	–	–	18.77 × 10–3
	5 × 10ˉ6	787	0.986	59 ± 0.1234	753 ± 0.1215	0.729	72.9	20.89 × 10–3
	7 × 10ˉ6	749	0.983	65 ± 0.1324	710 ± 0.1214	0.754	75.4	22.21 × 10–3
	9 × 10ˉ6	733	0.979	129 ± 0.1147	696 ± 0.1754	0.876	87.6	17.65 × 10–3
	11 × 10ˉ6	728	0.954	224 ± 0.1754	667 ± 0.1457	0.929	92.9	19.08 × 10–3
HM-1222	5 × 10ˉ6	814	0.969	57 ± 0.1441	737 ± 0.1425	0.719	71.9	20.76 × 10–3
	7 × 10ˉ6	794	0.962	63 ± 0.1784	705 ± 0.1112	0.746	74.6	19.29 × 10–3
	9 × 10ˉ6	772	0.959	90 ± 0.1324	688 ± 0.1012	0.822	82.2	19.98 × 10–3
	11 × 10ˉ6	751	0.930	160 ± 0.1245	640 ± 0.1120	0.900	90.0	16.76 × 10–3
HM-1224	5 × 10ˉ6	824	0.962	53 ± 0.1754	728 ± 0.1245	0.698	69.8	18.54 × 10–3
	7 × 10ˉ6	803	0.955	62 ± 0.1477	697 ± 0.1325	0.742	74.2	20.88 × 10–3
	9 × 10ˉ6	798	0.945	70 ± 0.1245	674 ± 0.1124	0.771	77.1	15.56 × 10–3
	11 × 10ˉ6	762	0.917	156 ± 0.1758	628 ± 0.1425	0.897	89.7	14.77 × 10–3
HM-1221	5 × 10ˉ6	833	0.943	50 ± 0.1985	687 ± 0.1654	0.680	68.0	17.6110–3
	7 × 10ˉ6	819	0.931	60 ± 0.1875	655 ± 0.1574	0.733	73.3	18.54 × 10–3
	9 × 10ˉ6	804	0.925	67 ± 0.1625	634 ± 0.1455	0.761	76.1	17.87 × 10–3
	11 × 10ˉ6	770	0.889	149 ± 0.1524	587 ± 0.1554	0.893	89.3	21.55 × 10–3