Allium Sativum (Garlic) Extract as Nontoxic Corrosion Inhibitor

Table 2

Corrosion rate (CR) of carbon steel immersed in well water in the absence and presence of inhibitors and the inhibition efficiency (IE) obtained by mass-loss method. Immersion period: 3 days; inhibitor: garlic extract + Zn²⁺.

	Zn^2+
Garlic extract mL	0 (ppm)		25 (ppm)
	CR (mdd)	IE %	CR (mdd)	IE %
0	22.42	—	17.94	20
2	11.21	50	6.73	70
4	7.17	68	4.48	80
6	2.24	90	1.79	92
8	1.35	94	0.90	96