Table 2. Technical Parameters Deduced from Tafel Polarization Curves of Mild Steel in 1 M HCl at Different Concentrations of Inhibitors at Room Temperature.

inhibitors	concn (mg L–1)	–Ecorr (mV vs Ag/AgCl)	Icorr (μA cm–2)	ba (mV dec–1)	–bc (mV dec–1)	%μp	RP	% μPR
	blank	404	1386	130	227		30
compound 1	10	447	249	106	190	82	153	80
	20	430	194	84	186	86	187	84
	40	436	139	77	185	90	215	86
	50	431	51	67	178	96	376	92
compound 2	10	421	430	96	162	69	83	64
	20	437	277	81	157	80	139	78
	40	426	222	75	163	84	183	84
	50	438	121	76	162	91	239	87
compound 3	10	413	623	105	154	55	62	52
	20	423	500	89	162	64	78	62
	40	436	332	82	163	76	141	79
	50	431	236	78	157	83	168	82
compound 4	10	424	471	109	179	66	74	59
	20	431	332	81	168	76	102	71
	40	428	264	82	172	81	129	77
	50	433	166	81	177	88	173	83