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

pub
Free personalized metal finishing help!


How long will a bright dipped copper part last?



(-----) February 27, 2008

Q. I am a Quality Manager who supply a customer with a Copper part stamping that went through a Bright Dip Mechanical process. The parts were processed a year ago and now this customer is complaining about oxidation in the part (like black spots). Is there a shelf life for this process? Thanks for your help.

Don Nalupta
Buyer - Orange, New Jersey
^


February 27, 2008

A. The shelf life would depend upon the exposure conditions, but it would not be long. As you would know from looking at copper roofs, it tarnishes or patinas. It would not be unusual to treat the copper with benzotriazole after bright dipping to extend the bright life somewhat. I think a year is a long time unless preservation measures were taken.

We also have a thread here about "Shelf life of PCBs / PWBs" which some readers might find relevant or interesting. Good luck.

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


March 4, 2008

A. Immersion coppering using a mechanical process (either with glass beads or self-tumbled) is a common means of providing a copper finish on parts (particularly small parts under 1 pound or under 6 inches in length), often for part identification or for lubricity. The deposit achieved is self-limiting (as the steel, the reducing agent, is covered with copper) and is quite thin - about 9 millionths of an inch. The deposit provides NO corrosion protection (see, for example, Ford S-5 or Chrysler PS-4935). In fact, the steel will corrode to protect the copper, since the copper is more noble. Inhibitive systems used to protect immersion coppered parts (contact your supplier) generally protect against the corrosion of both steel and copper. Leaving the surface slightly alkaline will extend the shelf life. Even so, the corrosion protection is VERY limited. If additional protection is required, a lacquer topcoat would definitely help.

tom_rochester
Tom Rochester
CTO - Jackson, Michigan, USA
Plating Systems & Technologies, Inc.
supporting advertiser
plating systems & technologies banner ad
^

none
adv.

spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread -or- Start a 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    -    ©1995-2022 finishing.com, Pine Beach, New Jersey, USA