Black Wattle Tannin As Steel Corrosion Inhibitor

Figure 6

Equivalent electric circuits proposed to simulate the experimental data of steel immersed in 0.1 mol L⁻¹ Na₂SO₄ (pH 6.0) for (a) 1, 3, and 7 days in the absence of tannin; for (b) 1, 3, and 7 days in the presence of tannin.