UAE Neem Extract as a Corrosion Inhibitor for Carbon Steel in HCl Solution

Figure 3

Anodic and cathodic polarization curves of carbon steel in an uninhibited 1.0 M HCl solution and in 1.0 M HCl containing various concentrations of the aqueous extract of Neem leaves.(1) 1.0 M HCl; (2) 1.0 M HCl + 0.20 g/L extract; (3) 1.0 M HCl + 0.50 g/L extract; (4) 1.0 M HCl + 1.00 g/L extract; (5) 1.0 M HCl + 2.00 g/L extract.