How does black oxide work?
Black oxide is a finishing process that involves immersing a part in a solution including sodium hydroxide and potassium nitrate. At Hubs, applying black oxide is a six-step process, in which a part is:
1. Run through machining and deburring
2. Cleaned using alkaline solutions
3. Rinsed in water
4. Black-oxidized via immersion in a hot (135-145ºC) alkaline bath for a period of five to 40 minutes, depending on the size of the part
5. Rinsed in water once again
6. Given an after-finish treatment with oil, lacquer, or wax to seal the oxide surface
The benefits of black oxide coating include:
1. Corrosion resistance: The black oxide layer provides a certain level of protection against corrosion and rust. While it may not be as effective as other types of coatings like electroplating or powder coating, it does offer a degree of protection against environmental factors.
2. Aesthetic appeal: Black oxide coating gives the metal a sleek, uniform black appearance, which is often preferred for aesthetic reasons, particularly in industries like firearms, automotive, and consumer goods.
3. Reduced glare: The blackened surface reduces glare and light reflection, making it useful in applications where reflections could be problematic, such as optics, camera equipment, and tools.
4. Mild lubrication: The black oxide layer can have a slight lubricating effect, reducing friction between moving parts. This property can be useful in certain applications where metal-to-metal contact occurs.
5. Minimal dimensional change: The process generally doesn't add significant thickness to the metal part, which is beneficial in applications where tight tolerances need to be maintained.
Original from:
Qingdao, China
Exported to:
North America, Europe, Australia
HXN Parts Application
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