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  2. Anodizing - Wikipedia

    en.wikipedia.org/wiki/Anodizing

    Aluminium anodizing (eloxal or Electrolytic Oxidation of Aluminium) [12] is usually performed in an acidic solution, typically sulphuric acid or chromic acid, which slowly dissolves the aluminium oxide. The acid action is balanced with the oxidation rate to form a coating with nanopores, 10–150 nm in diameter. [6]

  3. Chromate conversion coating - Wikipedia

    en.wikipedia.org/wiki/Chromate_conversion_coating

    For aluminum, the chromate conversion bath can be simply a solution of chromic acid. The process is rapid (1–5 min), requires a single ambient temperature process tank and associated rinse, and is relatively trouble free. [2] As of 1995, Henkel's Alodine 1200s commercial formula for aluminum consisted of 50-60% chromic anhydride CrO

  4. Anodic aluminium oxide - Wikipedia

    en.wikipedia.org/wiki/Anodic_aluminium_oxide

    Anodic aluminum oxide, anodic aluminum oxide (AAO), or anodic alumina is a self-organized form of aluminum oxide that has a honeycomb-like structure formed by high density arrays of uniform and parallel pores. The diameter of the pores can be as low as 5 nanometers and as high as several hundred nanometers, and length can be controlled from few ...

  5. Chrome plating - Wikipedia

    en.wikipedia.org/wiki/Chrome_plating

    Hexavalent chromium plating, also known as hex-chrome, Cr 6+, and chrome(VI) plating, uses chromium trioxide (CrO 3, also known as chromic anhydride) as the main ingredient. Hexavalent chromium plating solution is used for both decorative and hard plating, as well as bright dipping of copper alloys, chromic acid anodizing , and chromate ...

  6. Conversion coating - Wikipedia

    en.wikipedia.org/wiki/Conversion_coating

    A conversion coating is a chemical or electro-chemical treatment applied to manufactured parts that superficially converts the material into a thin adhering coating of an insoluble compound.

  7. Chromic acid - Wikipedia

    en.wikipedia.org/wiki/Chromic_acid

    This kind of chromic acid may be used as a cleaning mixture for glass. Chromic acid may also refer to the molecular species, H 2 CrO 4 of which the trioxide is the anhydride. Chromic acid features chromium in an oxidation state of +6 (and a valence of VI or 6). It is a strong and corrosive oxidizing agent and a moderate carcinogen.

  8. Electrochemical coloring of metals - Wikipedia

    en.wikipedia.org/wiki/Electrochemical_coloring...

    lactic acid 126ml/lit copper anodes, 0.25/A per square foot, gives various colors on copper and alloys, depending on the duration of the process, a large number of variations on this process have been developed, the most famous is the American Elektrocolor process developed by J.E.Stareck, Russian literature mentions more than 10 variants [ 22 ...

  9. Chemical coloring of metals - Wikipedia

    en.wikipedia.org/wiki/Chemical_coloring_of_metals

    Black for aluminum. Boil a solution of 20 g ammonium molybdate and 5 g of sodium thiosulfate in a liter of water, immerse the objects, rinse, dry, wax or lacquer after the development of color. [31] Lustre colours. Use a solution of 280 g of sodium thiosulphate, 25 g of cupric acetate and 30 g of citric acid. It can be used on copper and its ...

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