Fig. 1.
(a and b) SE micrograph displaying grain dependent chemically-induced, ridge-like features on the (a) surface of the AA5083-O alloy and (b) cross-section of the anodic oxide formed on the alloy after anodizing in Barker's reagent at 20 V for 2 min. (c) EDS spectrum of a spot in the oxide layer.(d) Optical micrograph of the Barker's reagent-anodized surface of the AA5083-O alloy (obtained under polarized light) displaying grain-distinct contrasts.