2022
DOI: 10.1149/1945-7111/ac62bc
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Formation of Bright White Plasma Electrolytic Oxidation Films with a Uniform Maze-Like Structure by Anodizing Aluminum in Ammonium Tetraborate Solutions

Abstract: Bright white plasma electrolytic oxidation (PEO) films with uniform maze-like structures were obtained by anodizing Al in an ammonium tetraborate solution. High-purity Al plates were galvanostatically anodized in 0.3-2.4 M ammonium tetraborate solutions at 303-343 K and 10-100 Am-2. A PEO film consisting of an outer porous layer consisting of amorphous alumina and crystalline alumina with α- and γ-phases and an inner amorphous barrier alumina layer was obtained on the Al surface. An extremely uneven PEO film w… Show more

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Cited by 6 publications
(1 citation statement)
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“…Therefore, electrochemical polishing (electropolishing) based on anodic dissolution in several electrolyte solutions, such as perchloric acid and phosphoric acid, is widely used for surface polishing aluminum. [7][8][9][10][11][12][13][14][15][16][17] Although electropolishing is a powerful and simple method for achieving smooth aluminum surfaces on three-dimensional shapes, characteristic dimples or stripe patterns measuring several tens of nanometers in length and sub-tens of nanometers in depth typically remain on the surface after electropolishing, and these nanostructures depend on the crystallographic orientation of aluminum. [18][19][20][21][22][23][24][25] Hence, an additional process consisting of barrier oxide formation and subsequent oxide dissolution was developed for further smoothing.…”
mentioning
confidence: 99%
“…Therefore, electrochemical polishing (electropolishing) based on anodic dissolution in several electrolyte solutions, such as perchloric acid and phosphoric acid, is widely used for surface polishing aluminum. [7][8][9][10][11][12][13][14][15][16][17] Although electropolishing is a powerful and simple method for achieving smooth aluminum surfaces on three-dimensional shapes, characteristic dimples or stripe patterns measuring several tens of nanometers in length and sub-tens of nanometers in depth typically remain on the surface after electropolishing, and these nanostructures depend on the crystallographic orientation of aluminum. [18][19][20][21][22][23][24][25] Hence, an additional process consisting of barrier oxide formation and subsequent oxide dissolution was developed for further smoothing.…”
mentioning
confidence: 99%