Black Wattle Tannin As Steel Corrosion Inhibitor

Table 4

Black wattle tannin inhibition efficiencies obtained from electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PP) in 0.1  mol L⁻¹ Na₂SO₄ solution (pH 6.0).

	Potentiodynamic polarization (PP)	Electrochemical impedance spectroscopy (EIS)
	IE (%)	IE (%)
1 day	91.06	96.57
3 days	93.03	96.81
7 days	75.74	65.52