Sodium Citrate as an Environmentally Friendly Corrosion Inhibitor of Steel in a Neutral Environment

Figure 4

Frequency dependencies of impedance modulus of 09G2S steel after 3 hours (a) and 24 hours (b) of exposure to a 0.1% NaCl solution with a concentration of sodium citrate of (1) 0 g/l, (2) 1.0 g/l, (3) 1.5 g/l, (4) 2.0 g/l, and (5) 2.5 g/l.

(a)

(b)