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

Table 3

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

Caffeine (ppm)	Zn^2+ (ppm)	Malic acid (ppm)	CR (mdd)	IE (%)
0	0	0	22.42	—
200	50	5	3.59	84
200	50	10	2.92	87
200	50	15	2.24	90
200	50	20	1.79	92
200	50	25	1.35	94