Opuntia ficus-indica Extract as Green Corrosion Inhibitor for Carbon Steel in 1 M HCl Solution

Table 2

Effect of Opuntia ficus-indica concentration on the and values obtained from EIS measurements at 25°C.

(ppm)	(Ohm cm^2)	(F cm^−2)	IE; (%)
—	159	117.2	—
50	344	98.1	53
75	357	92.2	55
100	257	89.5	38
150	232	98.2	31
200	197	106.1	19
300	174	115.4	8