Finish Overview

Black Oxide Coating

eMachineShop’s custom finishing services provide the ability to black oxide coat your custom parts easily.

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What is Black Oxide Coating?

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 resistance.


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