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  2. Bluing (steel) - Wikipedia

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

    Rust bluing was developed between hot and cold bluing processes, and was originally used by gunsmiths in the 19th century to blue firearms prior to the development of hot bluing processes. The process was to coat the gun parts in an acid solution, let the parts rust uniformly, then immerse the parts in boiling water to convert the red oxide Fe 2 O

  3. Phosphate conversion coating - Wikipedia

    en.wikipedia.org/wiki/Phosphate_conversion_coating

    Phosphate conversion coating is a chemical treatment applied to steel parts that creates a thin adhering layer of iron, zinc, or manganese phosphates to improve corrosion resistance or lubrication or as a foundation for subsequent coatings or painting.

  4. Concrete pavement restoration - Wikipedia

    en.wikipedia.org/wiki/Concrete_Pavement_Restoration

    When installing pavers over top of an existing asphalt of concrete pad, there are three installation options: sand set, bituminous set, and mortar set. [1] Due to rising oil prices, these methods are often less expensive than an asphalt overlay and last three times longer in addition to providing a greener, more sustainable solution.

  5. Differential heat treatment - Wikipedia

    en.wikipedia.org/wiki/Differential_heat_treatment

    The discoloration around the teeth indicate the metal that was heated and quenched, with the heat-affected zone visible as a thin layer between it and the ring of tempering colors. Flame hardening is often used to harden only a portion of an object, by quickly heating it with a very hot flame in a localized area, and then quenching the steel.

  6. Quench polish quench - Wikipedia

    en.wikipedia.org/wiki/Quench_polish_quench

    Quench polish quench (QPQ) is a specialized type of nitrocarburizing case hardening that increases corrosion resistance. It is sometimes known by the brand name of Tufftride, Tenifer or Melonite. [1] Three steps are involved: nitrocarburize ("quench"), polish, and post-oxidize ("quench"). [2]

  7. Oxide jacking - Wikipedia

    en.wikipedia.org/wiki/Oxide_jacking

    Oxide jacking has caused concrete spalling on walls of the Herbst Pavilion at Fort Mason Center in San Francisco. The expansive force of rusting, which may be called oxide jacking or rust burst, is a phenomenon that can cause damage to structures made of stone, masonry, concrete or ceramics, and reinforced with metal components.

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