Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site

World's #1 finishing resource since 1989
No login needed: Chime right in

topic 1858

Stripping PVD coatings



1998

We have at times been asked to "re-plate" watch cases and bands that have been finished with gold colored PVD coatings. Is there a simple method of stripping these coatings so that we can then gold plate the pieces. We were caught out at first by not recognising the coating and in some instances have had pieces that have had gold plated cases and PVD finished bands. Any advise appreciated

bob lynch Bob Lynch
plating company - Sydney, Australia


1998

Bob,

The gold-colored PVD coating is titanium nitride (TiN) and can be stripped in 1:1 HF/H2O or 1:1:1 H2O2/NH4OH/H2O.

Donald M. Mattox
Society of Vacuum Coaters
Albuquerque, New Mexico

Ed. note: Mr. Mattox is
               the author of -->



1998

At the 1998 Hardware Show I visited a number of the plumbing fixture booths.

In the MOEN Booth, they were showing off their LIFESHINE finish. It is a PVD coating they claim will last and last.

As an example, MOEN had a mini HANDS ON demonstration set up. They had a portable "Makita type" drill with a wire brush on it. They had people try the powered wire brush on the LIFESHINE finish of a faucet. I tried it and believe I gave it a good test. No NOTICEABLE DIFFERENCES ON THE FINISH.

I happen to recall MOEN, not to favor it or to disfavor any other company.

As a side line, the word at the show from the assorted plumbing fixture companies was simple. Many already had the PVD process. The ones who did not have it were rapidly going to it. Even though I noticed a difficulty in pronouncing the words that make up PVD (physical vapor deposition).

Dave Sheehan
- brush plating equipment & processes - Reading, Michigan


--

I don't have inside info on these finishes, but I understand that the Physical Vapor Deposition process is quite porous, and that the parts must therefore be electroplated for corrosion resistance first.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey


1998

Although I'm no expert on this subject. I believe the porosity of the coatings can be attributed to length of time the object is left in the furnace, purity of the alloys in the sputtering targets and the number of targets used.

Of course, if the base substrate is stainless, then electroplating of part before PVD is not really necessary. The cleaner the environment the better the coating.

I may be all wet and I look forward to others comments.

Mike

Michael Liu Taylor
Michael Liu Taylor
   specialty stainless steel distributor
Dallas, Texas



1998

There is some porosity in some PVD coatings. On the other hand some coatings have virtually no pores.

It depends on the process used and the experience of the people running the process. In the industry we use an assisting ion bombard (in one of it's various forms) to help densify the film as it is being laid down and thus eliminate the porosity. This essentially means that a plasma PVD is better than straight evaporation.

John Davis
John Davis
- Berthoud, Colorado, USA

none
finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact    -    Privacy Policy    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA