In order to exceed our customers’ ever-increasing expectations and requirements, we decided to offer the black oxide treatment service: a surface treatment that has the power to advantageously modify the properties of metal parts.
Example of a part subjected to “Black Oxide” treatment
What is black oxidation?
Sometimes referred to as chemical burnishing, blackening or “black oxide”, black oxidation is a chemical treatment that leads to the formation of a black iron oxide on the surface of metal parts subjected to it.
This treatment is mainly applied to ferrous materials, low alloy steel, copper and copper-based alloys.
Generally speaking, it is carried out in several stages, which may vary slightly :
- Cleaning;
- Rinsing
- Surface conditioning;
- Second rinse;
- Blackening;
- Third rinse;
- Sealing.
The “Black Oxide” treatment plant
The positive effects of black oxidation
The popularity of the “black oxide” treatment for metal parts is due in part to its various effects:
- It gives parts a pleasing appearance, covering them in a deep black that can have a glossy or matte finish;
- It increases corrosion resistance, especially when the black oxide is subsequently impregnated with oil or wax;
- In some cases, the treatment will contribute to better lubrication of the part.
Do you have parts to treat with Black Oxide?
The benefits of black oxide coating
Black oxidation treatment offers a number of advantages over other coating processes:
- Its build-up is minimal, meaning that it does not alter the dimensions of the parts treated;
- It has no effect on the hardness level of the parts;
- Treated parts can be welded without fear of generating noxious fumes;
- It can improve electrical conductivity.
Effects and Advantages of the Black Oxide Treatment
| Characteristic | Effect on Metal Parts |
| Appearance | Produces a deep black finish that can be glossy or matte |
| Corrosion resistance | Improved when the black oxide is impregnated with oil or wax |
| Lubrication | In some cases, the treatment can improve part lubrication |
| Dimensional impact | Minimal buildup that does not alter the dimensions of the treated parts |
| Material hardness | Does not affect the hardness of the parts |
| Weldability | Treated parts can be welded without generating harmful fumes |
| Electrical conductivity | May improve electrical conductivity |
A few examples of applications
Here are a few examples of components for which a black oxide coating is often beneficial:
- Machined or mechanically welded parts;
- Hydraulic parts;
- Gears;
- Springs;
- Hand tools;
- Screws, bolts, nuts, etc.
Parts subjected to black oxidation treatment
Typical Applications of Black Oxide Coating – Table
| Type of Component | Why Black Oxide Is Beneficial |
| Machined or welded parts | Improves appearance and surface durability |
| Hydraulic components | Provides protective surface treatment |
| Gears | Can contribute to improved lubrication |
| Springs | Protects the surface without altering dimensions |
| Hand tools | Enhances durability and aesthetic finish |
| Screws, bolts and nuts | Provides a uniform black finish and added protection |
Omnifab: for the best “black oxide” service
In conclusion, the “black oxide” treatment not only has an aesthetic impact, it also has the potential to improve the durability of parts. So don’t hesitate to ask us to submit your custom-made parts.
Just contact our team to find out more about our fast service!
