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 day55.759.6
3 days62.070.1
7 days68.774.3