In Situ Investigation of the Early-Stage Growth of Nanoporous Alumina

Figure 6

Samples anodized under 40 V using oxalic acid at 3 wt% (second anodization of a double anodization process): in situ measured current of anodization versus time under 40 V (left axis) and thickness of the porous layer measured in situ via the thickness fringes (right axis). The cross corresponds to the thickness of one sample measured ex situ by SEM.