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

Chime right in! (no registration req'd)

-----

"Resistance welding zinc plate trivalent chromate ring"



2005

We have recently changed from a hexavalent chromate to a trivalent chromate zinc plated ring retainer that is subsequently resistance welded with a ring electrode.

The ring retainer contains several small projections which melt and fuse to the sheet steel part after resistance welding.

My question- When resistance welding, is there a difference in electrical resistance between a trivalent chromate and a hexavalent chromate?

Graham Dodd
Automotive - Melbourne, Australia
^


2005

Your question is quite similar to letter 42062, Graham. Trivalent chromium conversion coatings tend to not be as corrosion resistant as hexavalent coatings, so topcoats (lacquers, waxes, sealers, silicates) are rather routinely applied to make up the difference--and these topcoats will generally significantly inhibit the conductivity.

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

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

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

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