Use of a Metallic Complex Derived from Curcuma Longa as Green Corrosion Inhibitor for Carbon Steel in Sulfuric Acid

Table 4

Electrochemical parameters used to simulate EIS data for carbon steel immersed in 0.5 M H₂SO₄ at different concentrations of Sn-metallic complex.

(ppm)	CPEdl (μSs^n/cm^2)	n	(ohm cm^2)	CPEf (μSs^n/cm^2)		(ohm cm^2)	(ohm cm^2)
0		0.7	96	—	—	—	16.24
100		0.8	102	—	—	—	17.56
200		0.8	387	—	—	—	159.1
400		0.8	542	—	—	—	104.9
600		0.8	555	—	—	—	119.3
800		0.8	900	—	—	—	214.9
1000		0.9	1962		0.9	780	—