Coloring of stainless are commonly known as following surface treatments.
|Spray coating, electrostatic coating,
electrodeposition, powder coating
|Anode oxidation to steel,
anode oxidation to non-ferrous metal
|Physical vapor deposition (PVD),
chemical vapor deposition CVD)
However, above mentioned treatment has the weakness to easily peel off because of being less adhesive power to stainless.
“Coloring by oxide film” is the surface treatment method which has been developed to overcome the defect.
Stainless surface has originally been covered by transparent passivate film (oxide film) which consists of chromium as chef ingredient.
When we proceed to grow this transparent film by 1/100 μunit, the surface of stainless begin to create various colors by the effect of the interference of light.
Since this color film is very thin, it can produce very clear color finish without harming material surface to be caused by coating or plating and also without giving any impact to change to dimension accuracy.
The grown oxide film has a role to further improve the intrinsic corrosion resistance of stainless.
Coloring black is most difficult among coloring process as well as achieving black uniformity.
But Abel-black has successfully materialized the target.