EFM parameters for C-steel 1 M HCl solution and the presence of altered doses of inhibitors I & II at 25 °C.

Comp.	Conc., M	i corr, μA cm−2	β a, mV dec−1	β c, mV dec−1	C.F (2)	C.F (3)	C.R., mmy−1	θ	IE%
1 M HCl	00	808.5 ± 0.2028	112.9 ± 0.2028	163.7 ± 0.1155	2.09	1.75	370.2		—
Inhibitor (I)	1 × 10−6	434.9 ± 0.2431	95.9 ± 0.2134	137 ± 0.1245	2.03	3.3	198.7	0.462	46.2
	5 × 10−6	313 ± 0.1452	101.9 ± 0.2354	144 ± 0.1158	2.02	2.36	143.1	0.613	61.3
	9 × 10−6	197.5 ± 0.2431	114.4 ± 0.2222	120 ± 0.1447	2.1	3.15	90.2	0.756	75.6
	13 × 10−6	141.3 ± 0.2102	110.9 ± 0.2145	115.7 ± 0.2603	1.37	2.18	64.6	0.825	82.5
	17 × 10−6	120.7 ± 0.2209	106.3 ± 0.2055	109.1 ± 0.2245	1.44	3.77	55.2	0.851	85.1
	21 × 10−6	99.8 ± 0.2010	104.4 ± 0.2218	116.1 ± 0.2403	1.54	1.37	45.6	0.877	87.7
Inhibitor (II)	1 × 10−6	327.6 ± 0.1753	147.7 ± 0.1732	149.7 ± 0.2028	2.18	1.98	149.7	0.595	59.5
	5 × 10−6	168 ± 0.2028	94.8 ± 0.2309	97.11 ± 0.2245	1.70	2.87	77.1	0.792	79.2
	9 × 10−6	140 ± 0.1732	87.9 ± 0.2333	149.5 ± 0.2358	1.93	3.32	64.1	0.827	82.7
	13 × 10−6	94.9 ± 0.1453	87.6 ± 0.1202	125.1 ± 0.2475	2.08	3.82	43.4	0.883	88.3
	17 × 10−6	85.9 ± 0.2333	129.4 ± 0.1732	152.1 ± 0.2333	1.78	1.27	34.6	0.894	89.4
	21 × 10−6	75.7 ± 0.1764	113.7 ± 0.1453	119.4 ± 0.2578	1.35	3.01	39.3	0.906	90.6