Highest quality standards
Metal working for more than 30 years
now with more than 50 employees.
Black finishing according to DIN 50938 or your standards
Description
The process of black finishing creates even, black surfaces on ferrous components.
Black finishing is considered a ‘wet’ chemical process. By dipping parts into a hot alkaline oxide solution the surface receives a thin mixed iron-oxide layer consisting of Fe3O4 and FeO. This conversion coating creates a dark black surface on the parts treated. As the surface is merely converted, black finishing is not considered a layering process.
Advantages
- optimum dimensional stability by converting surface instead of applying coats
- protection against corrosion (temporarily together with anti-corrosives)
- increased wearing resistance of material (flexional/abrasion resistance)
- conductibility
- amorphous layering
- no change of surface structure
- no distortion
- temperature resistant up to 300°C
Examples of application
Materials:
- iron
- steel
- cast iron
Areas of application:
- mechanical engineering
- tool manufacture
- roller bearing industry
- arms technology
Other advantages:
- inexpensive
- simple process
- environmentally friendly
- special measurements
Facts:
- Layer thickness: 0.5 – 2.0 µ
- Bath size: 2,500 x 1,200 x 700 mm*
- color: reddish-brown to black
- up to 2 tons weight per part
- rack working
- drum working
Standard applied::
- DIN 50938-Fe//[Processes]/[Aftertreatment]
- Processes available
-
A – One-dip (ca. 4.5 g/m²)
- B – Two-dip (ca. 5.5 g/m²)
- Aftertreatment available:
-
T 1 - Coating
-
T4 – oiling, greasing
- T10 – water displacement agent
- Your standard
Example:
The statement ‘surface acc. to DIN 50938-Fe//B/T4’ means: Treating follows two-dip process with subsequent preservation by dipping into an water-in-oil emulsion.
