No passwords, No popups, No AI, No cost:
we earn from affiliate purchases

Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Adver-
tise
Help
Wanted
Current
Q&A's
Site 🔍
Search
ted_yosem
Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
finishing.com -- The Home Page of the Finishing Industry

  The authoritative public forum
  for Metal Finishing since 1989
  mfhotline


  -----

Passivation of 440




What is the best passivation process for 440c?

Dave Mortenson
Pullbrite, Inc. - Fremont, California USA
2000



Electropolishing is considered the best way to passivate stainless steel. What particular application did you have in mind?

tom pullizzi animated    tomPullizziSignature
Tom Pullizzi
Falls Township, Pennsylvania
2000



2000

We use the Type 8 formulation found in AMS2700, which is the same as the Type VIII found in the olde QQ-P-35C (canceled) [link is to free spec at Defense Logistics Agency, dla.mil]. 45-55% nitric acid in water, 120-130F, for 30 minutes minimum. We don't use a chromate dip afterward.

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




(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:

Finishing
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g,
& Software


About/Contact  -  Privacy Policy  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"