Summary for pvd tarnish-free brass coatings Discussion
PVD tarnish-free brass coatings are the vacuum-applied finish the questioner is seeking for brass fittings and tapware, rather than lacquer. In the answer, the process is identified as physical vapor deposition (PVD), most commonly using zirconium nitride, sometimes with carbon additions to create darker colors. The reply notes that this is a complex and costly system: parts must be polished and thoroughly cleaned first, then receive about 12 to 15 microns of electroless nickel, followed by a very thin hexavalent chromium layer of roughly 0.25 microns, and finally the PVD coating itself at about 0.3 to 0.5 microns. The answer also warns that the equipment is expensive and names companies involved in the field, including BodyCote for coating services, Hauzer for equipment, and Vapor Technologies for both equipment and services.
We are exporters of Brass Fittings / tapware and accessories.
Where I can find more information about the process and chemicals for Tarnish – Free Coating which is done in Vacuum.
I am not talking about Lacquers !
I hope you understand and reply back Soon !
Best Regards
Mohit Arora
brass industries – Jalandhar, Punjab, India
2004
A. The process you are looking for is physical vapor deposition (PVD). The most common material deposited is zirconium nitride, with additions of carbon to provide darker hues. This is a rather complex, costly process. First, the polished parts must be thoroughly cleaned, then 12 too 15 microns of electroless nickel is deposited, followed by a thin layer of electrodeposited hexavalent chromium (around 0.25 microns), then the PVD layer is added, also thin, on the order of 0.3 to 0.5 microns. The PVD deposition equipment is very expensive. Key companies in the field include BodyCote (coating services), Hauzer (coating equipment), and Vapor Technologies (both equipment and services, owned by Masco, maker of Delta faucets and Baldwin locks).
Jim Treglio – scwineryreview.com
PVD Consultant & Wine Lover
San Diego, California
2004
A. As mentioned in previous response, barrier coating by electroplating plus finishing with TiN or ZrN by PVD is the way to go.
Kuppu Swamy
– Chennai, India
2006
adv.
