finishing.com -- The Home Page of the Finishing Industry

HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
current topics

60,000 Q&A topics -- Education, Aloha, & Fun

topic 17883

Passivating Super Invar (32-5)


2002

Does anyone have any ideas on passivating super Invar 32-5? I was told a 20% by volume nitric acid from 120-140 °F for 30 minutes.

Greg Wasielewski
- Palo Alto, California


2002

Warm Nitric Acid will remove the iron from the surface and controlled oxidize the nickel in the surface which is the very definition of "passivation".

robert probert



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


2002

Greg,

I'm not sure that Super Invar 32-5 is a corrosion resistant alloy, and therefore passivation may not be a good idea. You'd be wise to contact the manufacturer of your material.

Good luck!

lee gearhart Lee Gearhart
metallurgist - E. Aurora, New York





finishing.com is possible thanks to our supporting advertisers, including this shop:
none spacer

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

Disclaimer: It's not possible to 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 may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental Compliance


©1995-2020 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy
How Google uses data when you visit this site.