Surface Finishes

Black Oxide Services

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Black Oxide

Black oxide fertilized with oil can give the greatest amount of deterioration resistance. Black oxide is developed in a process similar to anodizing, where the parts are dipped into various warm bathrooms of chemicals that transform the surface of the material right into magnetite, which creates the black shade. Black oxide does not have a significant dimensional influence, therefore covering up parts is not necessary. This procedure can take a longer time due to the manual labor required and the time it takes for the baths to come to the appropriate temperature. Black oxide is a conversion finishing (similar to Alodine). It is utilized mostly for look and for mild rust resistance.

Applicable MaterialsCosmetic AvailabilityVisual Appearance
SteelNASmooth, matte black

Black Oxide Parts

Black Oxide Process

Black oxide is a conversion finish, suitable with steel, stainless steel, and copper, that provides a black appearance and gently boosts resistance to rust of parts.

Right here’s exactly how to apply black oxide:

1. Initial run components via machining and deburring.
2. Clean parts making use of alkaline options.
3. Rinse in water.
4. Black oxidizing. .Submerse the component in the hot (135-145ºC) alkaline bath for a period of 5 to 40 minutes depending on the dimension of the component
5. Rinse in water.
6. After-finish therapy. Seal the oxide surface with oil, lacquer, or wax. This imparts the wanted visual appearance and enhances the corrosion resistance of the part.

Black Oxide Design Considerations

Masking: Black oxide does not have a substantial dimensional influence, for that reason covering up components is not essential.


Black oxide is a conversion coating applied to ferrous metals, such as steel, to enhance corrosion resistance and create a black appearance.

Black oxide provides improved corrosion resistance, reduced light reflection, and an attractive black finish.

Black oxide forms a protective layer on the metal’s surface, reducing the risk of rust and corrosion.

No, black oxide is primarily used on ferrous metals like steel and iron.

Black oxide has a minimal impact on part dimensions, making it suitable for precision components and can be applied to parts with complex shapes and intricate features.

Black oxide enhances corrosion resistance but may not be sufficient for extended exposure to extreme outdoor or marine environments.

It is common to apply a rust inhibitor or sealant after black oxide to enhance corrosion resistance and durability, especially in harsh environments.

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