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Black oxide - Wikipedia, the free encyclopedia

Black oxide
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This article is about modern black oxide coatings. For historical uses, see Bluing (steel).
Black oxide or blackening is a conversion coating for ferrous materials, copper and copper based alloys, zinc, powdered metals, and silver solder.[1][2] It is used to add mild corrosion resistance and for appearance.[3][4] To achieve maximum corrosion resistance the black oxide must be impregnated with oil or wax.[5] One of its advantages…

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Bluing (steel) - Wikipedia, the free encyclopedia

Bluing (steel)
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This article is about the historical uses of black oxide. For modern uses of black oxide, see Black oxide.
Bluing is a passivation process in which steel is partially protected against rust, and is named after the blue-black appearance of the resulting protective finish. True gun bluing is an electrochemical conversion coating resulting from an oxidizing chemical reaction with iron on the surface selectively forming magnetite (Fe3O4), the black oxide of iron.

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