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  2. Bluing (steel) - Wikipedia

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

    Friction, as from holster wear, quickly removes cold bluing, and also removes hot bluing, rust, or fume bluing over long periods of use. It is usually inadvisable to use cold bluing as a touch-up where friction is present. If cold bluing is the only practical option, the area should be kept oiled to extend the life of the coating as much as ...

  3. Black oxide - Wikipedia

    en.wikipedia.org/wiki/Black_oxide

    The NaOH (caustic soda) and elevated temperature cause Fe 3 O 4 (black oxide) to form on the surface of the metal instead of Fe 2 O 3 (red oxide; rust). While it is physically denser than red oxide, the fresh black oxide is porous, so oil is then applied as post treatment to the heated part, which seals it by "sinking" into it.

  4. Bluing - Wikipedia

    en.wikipedia.org/wiki/Bluing

    Bluing (steel) is a passivation process in which steel is partially protected against rust Bluing may also refer to: Bluing (fabric), a blue dye used to improve the appearance of fabrics; Bluing (hair), a blue dye used to improve the appearance of hair "bluing" of machine parts to check for tolerances, see engineer's blue

  5. Copper selenide - Wikipedia

    en.wikipedia.org/wiki/Copper_selenide

    Copper selenide is produced in situ to form a protective black coating on iron or steel parts in some cold-bluing processes. [8] Bluing solutions that operate in this manner will typically be labeled as containing selenous acid or selenium dioxide. [9] [10] It has also been investigated for use in the treatment of colon cancer. [6]

  6. Case-hardening - Wikipedia

    en.wikipedia.org/wiki/Case-hardening

    The steel darkens significantly and shows a mottled pattern of black, blue, and purple caused by the various compounds formed from impurities in the bone and charcoal. This oxide surface works similarly to bluing , providing a degree of corrosion resistance, as well as an attractive finish.

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    'Button' batteries: More kids are going to the ER for swallowing them, study finds.Why that's really dangerous. Based on an estimated 7,032 incidents a year, study authors determined that on ...

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  9. Hot-dip galvanization - Wikipedia

    en.wikipedia.org/wiki/Hot-dip_galvanization

    The resulting coated steel can be used in much the same way as uncoated. A typical hot-dip galvanizing line operates as follows: [2] Steel is cleaned using a caustic solution. This removes oil/grease, dirt, and paint. The caustic cleaning solution is rinsed off. The steel is pickled in an acidic solution to remove mill scale.