Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Passi Test for Pickling and Passivation of Stainless Steel

Passi Test for Pickling and Passivation of Stainless Steel

Passi Test for Pickling and Passivation of Stainless Steel

For one of our project, because of environmental constraints, We have got COMPANY approval to use Sulfuric Acid as chemical for Pickling and Passivation instead of Nitric Acid. COMPANY is asking to do Ferroxyl testing and Passi Testing. Ferroxyl testing requirements are specified in A380. However, no detail found about Passi Testing. It is requested if someone can please share any detail about Passi Testing. Much Appreciate if ASTM number is shared. Thanks

RE: Passi Test for Pickling and Passivation of Stainless Steel

I hope that your material had been very well pickled before you used sulfuric on it.
We have pickled in hot sulfuric+HF, but we had to follow with a dip in nitric in order to get consistently good results.
There are tests other than the ferroxyl, look in A967.
I have had poor luck with the Koslow and similar devices.
They seam too sensitive to other variations (surface finish and such).
What we do for a first test (unofficial) is cover an area with moisture trapping material (the stuff the disposable diapers are made from) and wet it down with DI water. After being wet for 24 hours we look for signs of rust staining.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


eBook - Rethink Your PLM
A lot has changed since the 90s. You don't surf the Web using dial-up anymore, so why are you still using a legacy PLM solution that's blocking your ability to innovate? To develop and launch products today, you need a flexible, cloud-based PLM, not a solution that's stuck in the past. Download Now
White Paper - Using Virtualization for IVI and AUTOSAR Consolidation on an ECU
Current approaches used to tackle the complexities of a vehicle’s electrical and electronics (E/E) architecture are both cost prohibitive and lacking in performance. Utilizing virtualization in automotive software architecture provides a better approach. This can be achieved by encapsulating different heterogeneous automotive platforms inside virtual machines running on the same hardware. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close