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

Figure 2

AC impedence spectra of carbon steel immersed in (a) well water (Blank) (Bode plot), (b) caffeine (200 ppm)-Zn²⁺ (50 ppm) (Bode plot), and (c) Caffeine (200 ppm)-Zn²⁺ (50 ppm)-malic acid (25 ppm) (Bode plot).

(a)  

(b)

(c)