The low frequency
(LF) impedance,
|Z|0.01 Hz places a lower limit on the sum of
the three resistive components: solution resistance, Rsol, coating
resistance, Rc and charge transfer resistance, Rt. It is generally considered
that a coating film showing a LF impedance higher than
108cm2 reveals good anticorrosion performance, while the one
showing LF impedance lower than 106cm2 has poor anticorrosive
properties