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 day91.0696.57
3 days93.0396.81
7 days75.7465.52