CHROMIUM PLATING
Chromium plating is used for corrosion protection, as a decorative coating and to create a wear-resistant and hard surface.
WHICH MATERIALS ARE SUITABLE FOR CHROMIUM PLATING?
Several types of metal are suitable for chromium plating:
| Steel | Cast iron |
| Stainless steel |
Nitro-carburised steel (<10 μm) |
|
Aluminium |
Tenifer-treated steel and sintered materials |
|
Brass |
Copper and copper alloys |
PRE-TREATMENT
If you want a shiny surface, the item should be burnished and polished. The surface is typically coated with polished copper and polished nickel previous to chromium plating: The copper levels and smooths out the surface, while the nickel gives it a hard base. The nickel coating can be either shiny or matt.
The chromium and nickel coating functions as a barrier to the surroundings and should be fully sealed. The typical thickness of the layer is 2-12 μm, providing moderate protection. For outdoor use the thickness should be increased or a middle layer of copper should be added.
THE PROCESS OF CHROMIUM PLATING
- The items are degreased and pickled.
- Chromium plating is deposited electrolytically.
- The items are dried in a fan-assisted oven.
Lacquering and colour-printing can be done subsequently.
