| |
44024
Blackening stainless steels
February 14, 2007
Can the black oxide (hot or cold process) be used to provide a
permanent deep rich black/brown finish on stainless steels
(austenitic, ferritic and martensitic all inclusive).
Also, will a pre-treatment of a full electro-polish prohibit the
blackening process?
Thank you,
Phil Parsche
finishing services - Pleasant Prairie, Wisconsin, USA
February 26, 2007
Doubtful that anyone will guarantee "permanent deep rich
black/brown finish...all inclusive."
Electropolishing shouldn't prevent blackening although may require
slightly longer acid pretreatment as it leaves a thin (~10 nm)
Cr-enriched surface. I do not expect electropolishing time to have
much effect, as at steady state the surface alloy is uniformly
removed.
You probably need to send out various stainless samples for
blackening. Read MIL-DTL-13924D COATING, OXIDE, BLACK, FOR FERROUS
METALS for precautions regarding hardened martensitic stainless &
warn the vendor accordingly.
|
Ken Vlach
- Goleta, California
|
|
February 28, 2007
You might want to check into PVD titanium black stainless steel.
|
|
Michael Liu
Taylor
specialty stainless steel distributor
Dallas, Texas
|


 |
|