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The oxide film formed by black oxide treatment provides a certain degree of corrosion resistance protection. However, its effectiveness depends on the specific conditions of treatment and the type of metal. In extreme corrosive environments, further protective measures may be required.

Black oxide treatment typically only generates an extremely thin oxide film on the metal surface, so its ability to affect dimensional accuracy is very limited.

– Pickling: Metal parts are immersed in an acidic solution to clean the surface and remove oxides and contaminants. This process is to making sure the surface cleanliness to prepare for further processes.

– Alkaline Cleaning: After pickling, parts are cleaned and neutralized with an alkaline cleaner to ensure no harmful residues remain.

– Black Oxidizing: Cleaned parts are immersed in a black oxide solution that typically contains sodium hydroxide and other compounds, forming a black oxide film.

– Sealing: Optionally, parts are immersed in a sealant to increase corrosion resistance by sealing the oxide film.

The main purpose of black oxide treatment is to increase corrosion resistance, reduce reflectivity, provide surface protection, and improve the appearance of metal parts.

Black oxide treatment does not significantly affect the heat treatment of parts. However, the material of the part and heat resistance level should always be taken in to account before the process.