Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site
pub Where the world gathers for
plating, anodizing, & finishing Q&As since 1989





-----

Using lead to repair dents in copper before gold plating





December 29, 2011

Q. Dear fellow metal workers, I am in the process of prepping copper sinks that will be gold plated. However, some areas are inacessible to remove indentations caused in production. I am planning to fill the damage with lead solder, would this affect the plating process

David Sandford
- France



First of two simultaneous responses -- December 29, 2011

Be aware that in time the copper and lead will migrate right through the gold and corrode on top. You need a diffusion barrier of palladium or nickel between the copper/lead and the gold. Also. to plate over lead you need to prepare the surface with a dip in fluoboric acid. Lead forms an insoluble salt with sulfates and chlorides, then later the plating peals off.

robert probert
Robert H Probert
Robert H Probert Technical Services
supporting advertiser
Garner, North Carolina
probertbanner



Second of two simultaneous responses -- January 1, 2012

Lead will absolutely alter your subsequent plating, maybe to the point of making it a total failure. Why not brush plating with copper and dress back the surface to blend the repaired area. Acid copper solution will do a great job. Very fast and localized build-up, no corrosion to surrounding copper, little or no masking, no need to heat the part, no need to change your subsequent gold plating process, etc, etc. If dents are too deep (+1/32") silver brazing would be an option.
G. Marrufo-Mexico

Guillermo Marrufo
Monterrey, NL, Mexico


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 -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    -    ©1995-2023 finishing.com, Pine Beach, New Jersey, USA