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  2. Passivation (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Passivation_(chemistry)

    Various testing methods are available to determine the passivation (or passive state) of stainless steel. The most common methods for validating the passivity of a part is some combination of high humidity and heat for a period of time, intended to induce rusting. Electro-chemical testers can also be utilized to commercially verify passivation.

  3. Phosphate conversion coating - Wikipedia

    en.wikipedia.org/wiki/Phosphate_conversion_coating

    The Parkerizing process cannot be used to protect non-ferrous metals such as aluminium, brass, or copper but can be used for chemical polishing or etching instead. It similarly cannot be applied to steels containing a large amount of nickel, or on stainless steel. Passivation can be used for protecting other metals.

  4. Electropolishing - Wikipedia

    en.wikipedia.org/wiki/Electropolishing

    Stainless steel preferentially removes iron from the surface and enhances the chromium/nickel content for the most superior form of passivation for stainless steel. Electropolishing can be used on a wide range of metals including stainless steel, aluminum, copper, brass and titanium.

  5. Bluing (steel) - Wikipedia

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

    Similarly, stainless steel parts may be immersed in a mixture of nitrates and chromates, similarly heated. Either of these two methods is called 'hot bluing'. Hot bluing is the current standard [ 7 ] in gun bluing, as both it and rust bluing provide the most permanent degree of rust-resistance and cosmetic protection of exposed gun metal, and ...

  6. Anodizing - Wikipedia

    en.wikipedia.org/wiki/Anodizing

    Anodizing is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts. The process is called anodizing because the part to be treated forms the anode electrode of an electrolytic cell.

  7. Chromate conversion coating - Wikipedia

    en.wikipedia.org/wiki/Chromate_conversion_coating

    Zinc chromate conversion coating on small steel parts. Chromate conversion coating or alodine coating is a type of conversion coating used to passivate steel, aluminium, zinc, cadmium, copper, silver, titanium, magnesium, and tin alloys.

  8. Chemical coloring of metals - Wikipedia

    en.wikipedia.org/wiki/Chemical_coloring_of_metals

    anodizing – electrolytic passivation process used to increase the thickness of the natural oxide layer, producing a porous surface which can accept organic or inorganic dyes easily. In the case of titanium, niobium, and stainless steel, the colour formed is dependent on the thickness of the oxide (which is determined by the anodizing voltage).

  9. Intergranular corrosion - Wikipedia

    en.wikipedia.org/wiki/Intergranular_corrosion

    Around 12% chromium is minimally required to ensure passivation, a mechanism by which an ultra thin invisible film, known as passive film, forms on the surface of stainless steels. This passive film protects the metal from corrosive environments. The self-healing property of the passive film make the steel stainless.

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