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!

*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.


Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

Passivation of 17/4 PH Stainless Steel

Passivation of 17/4 PH Stainless Steel

I am looking for for a definitive procedure on passivating 17-4 PH stainless steel for our cylinders.  I was recently told that you don't passivate this grade as it is self passivating.  The cylinders are bored and honed from double H1150 17/4,

RE: Passivation of 17/4 PH Stainless Steel

We use the Type VIII listed in QQ-P-35.  Since it doesn't have the sodium dichromate added to the nitric acid, you have far fewer control & consistency problems.  It works well.

You probably know that QQ-P-35 was cancelled, and replaced by the SAE document AMS-QQ-P-35, which has been cancelled (Feb 2005) and replaced by AMS 2700.  But that's all just moving words and titles around.  The recipes in the QQ-P-35 listed above are still good.

And you DO want to passivate.  Stray iron or steel particles that get stuck on the surface can cause the stainless steel to show surface rust, which nobody likes.

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!


White Paper: Agile Product Engineering and Improved Product Outcomes
Today’s product development cycle is fraught with difficulties. Increased demands for complex functionality and reduced product development windows cause engineering teams to borrow practices from the IT industry, swapping outdated serial workflows for a more flexible and collaborative design method known as Agile Product Engineering. 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