No registration or passwords; no pop-up ads -- just aloha, fun, & answers.
(as an eBay Partner & Amazon Affiliate earns from qualifying purchases).
Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Advertise
 
Help
Wanted
Current
Q&A's
Site 🔍
Search
pub  Where the
world gathers for metal finishing
Q&As since 1989



-----

We burned cadmium parts by accidentally plating at 2-3 times normal amperage





July 24, 2008

What happens if during cadmium plating process to a steel part HT 200 to 300 KSI, the amperage utilized is excessively high (2 or 3 times above necessary or more) for the area and thickness required? It's possible to burn the part and the metal became brittle? Thanks a lot.
Sincerely
Jorge

Jorge M-Fortun
aviation tech - Miami, Florida, USA



July , 2008

Unfortunately, I think the parts probably must be scrapped. Jorge. When you plate at a higher current density than the solution allows, what that really means is all those extra electrons at the cathode cannot reduce cadmium ions to cadmium metal because there is insufficient cadmium within the boundary layer. Yet the current is flowing, and the explanation is hydrogen ions are being pulled out of the water and converted to atomic hydrogen (hydrogen gas). Operating a plating process at 2 to 3X the recommended amperage produces a huge amount of atomic hydrogen to cause hydrogen embrittlement.

Regards,

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


none
adv.
this text gets replaced with bannerText
spacer gets replaced with bannerImages



(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

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  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"