Black Oxide / Steel, Stainless Steel

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Black Oxide

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Introduction

Black oxide, sometimes referred to as blackening, is a low-cost finishing method for adding corrosion resistance, reducing reflection, and enhancing the appearance of parts. Black oxide conversion coatings are created by submerging ferrous parts in a hot alkaline aqueous salt solution bath. Once immersed, a chemical reaction is created on the surface of the parts, which results in a magnetite coating. As a final step, an after-finish of oil, wax, or lacquer is applied for added corrosion esistance.

Material	Color	Applications	Types
Stainless Steel, Steel	Black	Fasteners, Auto parts, Gearing	Hot black oxide, Mid-temperature black oxide, Room temperature black oxide

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Design Considerations

✔ Economics - Black oxide is far less expensive than painting, electroplating or powder coating.

✔ Productivity - Blackening can be done to large batches of parts by tumbling or fixturing, making it ideal for processing small parts.

✔ Size Change - There are no significant dimensional changes to a black oxide part. The layer thickness depth can be measured approximately one micron.

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BLACK OXIDE / Steel, Stainless Steel