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Advanced hard anodic alumina coatings measuring Hv=610–769 on the Vickers hardness scale were obtained on an aluminum surface via aluminum anodizing using a new electrolyte, etidronic acid. The ordered porous alumina was fabricated by two-step etidronic acid anodizing at 260V under self-ordering conditions, and pore-widening was carried out to control the porosity of the porous alumina. The Vickers...
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