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The Characterization of Anodic Aluminas
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1966
Year
Aluminium NitrideEngineeringElectrode-electrolyte InterfaceAnodic AluminasChemistryHigh‐purity Aluminum SheetAnodizingChemical EngineeringCorrosionCalcium AluminateProtective CoatingMaterials EngineeringMaterials ScienceBarrier LayerElectrochemistryBarrier LayersSurface ScienceIonic ConductorElectrochemical Surface Science
High‐purity aluminum sheet was anodized in eight dicarboxylic electrolytes: oxalic, malonic, succinic, and tartaric acids, ammonium tartrate, and fumaric, glutaric and adipic acids. The anodic coatings were quantitatively analyzed by infrared techniques to evaluate the amounts of porous and barrier layers in each. We found that the anodizing temperature influenced the amount of porous layer formed and appeared to be related to the dissolving tendency of the electrolyte. Furthermore, we found a shift in the absorption wavenumber of the barrier layer that correlates with the amount of porous layer. A mechanism for formation of porous layer from barrier layer is proposed.