Inhibitory Mechanism of Carbon Steel Corrosion in Sea Water by an Aqueous Extract of Henna Leaves

Table 2

The corrosion inhibition efficiencies and the corresponding corrosion rates (millimeter per year) of HE-Zn²⁺ system.

Inhibitor HE (mL)	Zn^2+ (ppm)
	0		25		50
	IE%	CR (mn/y)	IE%	CR (mm/y)	IE%	CR (mm/y)
0	—	0.1576	16	0.1323	47	0.0835
2	28	0.1134	41	0.0929	64	0.0567
4	35	0.1024	47	0.0835	76	0.0378
6	47	0.0835	71	0.0457	88	0.0189
8	65	0.0551	94	0.0094	82	0.0283
10	47	0.0835	64	0.0567	75	0.0394