Fitting the data with an equivalent circuit (Fig. 4), if required,
would involve a capacitance term, a resistance term in parallel with
the capacitance term and at least one constant phase element complemented
with other terms for the low frequency response. The
resistance term is the most relevant one in this case, as it describesthe corrosion rate under the plug. It is worth noting that the low
frequency part could be mistaken for the pore resistance, but is
dominated by the diffusion/blister term.