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

Table 3

Electrochemical parameters obtained from polarization curves for carbon steel immersed in 0.5 M H₂SO₄ at different concentrations of Sn-metallic complex.

(ppm)	(mV)	(μA/cm^2)	(mV/dec)	(mV/dec)	I.E. (%)
0	-470	1.04	290	-362	—
100	-460		158	-340	82
200	-460		111	-288	89
400	-480		76	-266	89
600	-480		65	-235	94
800	-460		48	-207	97
1000	-470		16	-180	99