The Electrochemical Variation of a Kind of Protein Staining and Food Dye as a New Corrosion Inhibitor on Mild Steel in Acidic Medium

Table 2

The EIS parameters of mild steel specimens in inhibited and uninhibited solutions at different immersion times.

Time/C (M)	Rs	Rp	CPE		RL	L
	( cm^2)	( cm^2)	(F/cm^2)	n	( cm^2)	(H)	(%)
1 h
Blank	1.2	72	110	0.94	8	4	-
1.0x10^−5	1.3	576	81	0.89	-	-	87.5
5.0x10^−5	1.4	755	75	0.87	-	-	90.4
1.0x10^−4	1.1	888	70	0.86	-	-	91.9
5.0x10^−4	1.1	902	62	0.82	-	-	92.0
1.0x10^−3	1.2	935	54	0.81	-	-	92.3
24 h
Blank	1.2	11	2600	0.95	1.3	1.1	-
1.0x10^−5	1.1	520	1392	0.84	-	-	97.9
5.0x10^−5	1.3	676	862	0.83	-	-	98.4
1.0x10^−4	1.2	715	392	0.81	-	-	98.5
5.0x10^−4	1.2	735	197	0.80	-	-	98.5
1.0x10^−3	1.1	864	95	0.81	-	-	98.7
48 h
Blank	1.1	5	10123	0.94	0.7	1	-
1.0x10^−5	1.1	303	5448	0.84	-	-	98.3
5.0x10^−5	1.0	536	2079	0.83	-	-	99.1
1.0x10^−4	1.1	695	995	0.81	-	-	99.3
5.0x10^−4	1.2	725	506	0.81	-	-	99.3
1.0x10^−3	1.1	798	171	0.79	-	-	99.4
72 h
Blank	1.2	4	19642	0.90	0.4	0.4	-
1.0x10^−5	1.2	247	9792	0.82	-	-	98.4
5.0x10^−5	1.1	525	4024	0.81	-	-	99.2
1.0x10^−4	1.3	656	2028	0.79	-	-	99.4
5.0x10^−4	1.2	720	1325	0.79	-	-	99.4
1.0x10^−3	1.3	770	365	0.78	-	-	99.5
96 h
Blank	1.3	4	38697	0.83	0.9	0.3	-
1.0x10^−5	1.1	174	20064	0.78	-	-	97.7
5.0x10^−5	1.2	374	9956	0.78	-	-	98.9
1.0x10^−4	1.0	488	3500	0.78	-	-	99.2
5.0x10^−4	1.0	610	1603	0.78	-	-	99.3
1.0x10^−3	1.0	630	549	0.77	-	-	99.4
120 h
Blank	1.4	4	36520	0.89	0.4	0.3	-
1.0x10^−5	1.0	134	20108	0.77	-	-	97.0
5.0x10^−5	1.3	278	10002	0.75	-	-	98.6
1.0x10^−4	1.2	402	3750	0.75	-	-	99.0
5.0x10^−4	1.1	490	1803	0.74	-	-	99.2
1.0x10^−3	1.1	525	672	0.60	-	-	99.2