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

Table 2

Effect of the Sn-metallic complex on the weight loss, inhibitor efficiency, and steel surface area covered by the inhibitor, θ, for carbon steel immersed in 0.5 M H₂SO₄.

(ppm)	(mg/cm^2)	I.E.	θ
0	102.7	—	—
100	16.1	80.5	0.805
200	13.1	82.1	0.821
400	10.8	84.2	0.842
600	2.1	85.3	0.853
800	1.6	87.2	0.872
1000	1.1	89.1	0.891