Table 4.

The electrochemical parameters derived from Nyquist diagrams of an iron electrode in a 1M HCl solution without and with different concentration of the Galactomannan.

Concentrations (g/l)	Re (Ω.cm2)	Rt (Ω.cm2)	CPE (mF.n−1)	α	Cdl (mF)	E (%)
Blank	0.5 ± 0.1	68.5 ± 0.2	0.368 ± 0.002	0.70 ± 0.02	152.5 ± 0.2	–
0.25	1.3 ± 0.1	341.7 ± 0.2	0.245 ± 0.003	0.71 ± 0.02	0.917 ± 0.003	80 ± 0.1
0.50	1.3 ± 0.1	360.1 ± 0.2	0.210 ± 0.0015	0.73 ± 0.01	0.802 ± 0.001	81 ± 0.2
0.75	1.4 ± 0.1	446.6 ± 0.1	0.141 ± 0.004	0.79 ± 0.02	0.672 ± 0.004	84 ± 0.1
1.00	1.4 ± 0.1	490.4 ± 0.2	0.131 ± 0.005	0.78 ± 0.01	0.625 ± 0.005	86 ± 0.2