Active layer, found on the surface of wrought aluminium alloys, seems to be the most important factor determining the filiform corrosion susceptibility of these aluminium products [1]. This active layer is nothing but the heavily deformed micro-grained surface layer formed after rolling, with a very high density of oxides and intermetallics, having a much lower potential compared to the bulk metal. It is therefore critical to have a better understanding of the corrosion properties of this heavily deformed surface layer. This paper proposes a novel way for characterising this layer, which aims, at the end, to combine the bulk as well as the local characterisation of the optical, chemical, and electrdeg Chemical properties of the layer.
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