Black Wattle Tannin As Steel Corrosion Inhibitor

Table 7

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	55.7	59.6
3 days	62.0	70.1
7 days	68.7	74.3