Fig. 2. Current–time plot related to anodized sample P1 and P2. (a) The current intensity for sample P1 shows two main regions – R1, showing a sharp drop in current intensity and region R2, with a steady current intensity; and (b) the current intensity for sample P2 behaved almost identical to the P1 for the first 60 s (t = 60 s). The main difference of the current profiles is that from t = 60 s (region R3) a sharp increase of the current intensity was observed for the sample P2.