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Through-thickness anodic oxidation of aluminum sheet has been possible to form 100–400μm thick transparent alumina in 0.3M oxalic acid at 30–70V. Transmission at 900–1100nm was 20–60%, the higher being at lower anodizing voltages. Two-step anodizing after electropolishing in Brytal solution resulted in best hexagonal order at 50V. The alumina layers with ordered porosity growing from the opposite...
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