Effect of Caffeine-Zn²⁺ System in Preventing Corrosion of Carbon Steel in Well Water

Table 6

Influence of pH on IE of caffeine (200 ppm)-Zn²⁺ (50 ppm).

System	pH	CR (mdd)		IE (%)
		Presence of inhibitor	Absence of inhibitor
Caffeine (200 ppm)-Zn^2+ (50 ppm)	3	79.70	88.56	10
	5	43.45	72.41	40
	7	14.62	52.23	72
	8	4.04	22.42	82
	11	0.22	10.81	98