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  2. Black oxide - Wikipedia

    en.wikipedia.org/wiki/Black_oxide

    Like hot black oxide, mid-temperature black oxide converts the surface of the metal to magnetite (Fe 3 O 4). However, mid-temperature black oxide blackens at a temperature of 90–120 °C (194–248 °F), [6] significantly less than hot black oxide. This is advantageous because it is below the solution's boiling point, meaning there are no ...

  3. Rust converter - Wikipedia

    en.wikipedia.org/wiki/Rust_converter

    Rust converters are chemical solutions or primers that can be applied directly to an iron or iron alloy surface to convert iron oxides into a protective chemical barrier. These compounds interact with iron oxides, especially iron(III) oxide , converting them into an adherent black layer ( black oxide ) that is more resistant to moisture and ...

  4. Bluing (steel) - Wikipedia

    en.wikipedia.org/wiki/Bluing_(steel)

    3 to black oxide Fe 3 O 4, which forms a more protective, stable coating than the red oxide; the boiling water also removes any remaining residue from the applied acid solution (often nitric acid and hydrochloric acid diluted in water). The loose oxide was then carded (scrubbed) off, using a carding brush – a wire brush with soft, thin ...

  5. Chemical coloring of metals - Wikipedia

    en.wikipedia.org/wiki/Chemical_coloring_of_metals

    Brown or black can be used as a base color for copper patina. If the amount of chlorides decreases the color will be more bluish-green, if carbonate decreases, more yellow-green. [27] Black for copper. Solution of sodium polysulfide 2.5%, items must be submerged in the solution after color developing, wash, dry and wax or varnish colored object ...

  6. Nickel oxide hydroxide - Wikipedia

    en.wikipedia.org/wiki/Nickel_oxide_hydroxide

    Nickel oxide hydroxide is the inorganic compound with the chemical formula NiO(OH). It is a black solid that is insoluble in all solvents but attacked by base and acid. It is a component of the nickel–metal hydride battery and of the nickel–iron battery.

  7. Copper chromite - Wikipedia

    en.wikipedia.org/wiki/Copper_chromite

    An active copper chromite catalyst which includes barium in its structure can be prepared from a solution containing barium nitrate, copper(II) nitrate, and ammonium chromate. When these compounds are mixed a resulting precipitate is formed. This solid product is then calcined at 350–400 °C to yield the catalyst: [11]

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  9. Iron(II) oxide - Wikipedia

    en.wikipedia.org/wiki/Iron(II)_oxide

    Iron(II) oxide or ferrous oxide is the inorganic compound with the formula FeO. Its mineral form is known as wüstite . [ 3 ] [ 4 ] One of several iron oxides , it is a black-colored powder that is sometimes confused with rust , the latter of which consists of hydrated iron(III) oxide (ferric oxide).

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