No passwords, no registration, no paywalls, no popups, no AI

As an Amazon Associate & eBay Partner we earn from affil links

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

Search our quarter-million Q&As

Home of the finishing HOTLINE since 1989

-----

Passivation to meet AMSQQP35 TYPE 2/ TYPE 8

Is there any other way to passivate stainless to meet with military QQ-P-35C (canceled) [link is to free spec at Defense Logistics Agency, dla.mil] TYPE 2/ TYPE 8 without the use of Nitric Acid?

Dustin Colina
electropolishing - Clearwater, Florida
2005

adv.
We have developed passivation technology based on low concentration of phosphoric acid. It is environmentally friendly and can be applied for food industry also. Contact us for details.

Anna Berkovich
~~Russamer Lab~~ - Pittsburgh, Pennsylvania
(ed. update July, 2025: sorry, Anna has retired)
2005

Dustin, you can passivate without using nitric acid, as Anna says, and as other folks who use citric acid will tell you. Yet AMSQQP35 [canceled] Type 2 or Type 8 both require nitric acid. If you're locked into using that specification, you are locked into using nitric acid based formulations.

Lee Gearhart
metallurgist - E. Aurora, New York
2005

www.finishing.com is made possible by supporting advertisers ...
this text gets replaced with bannerText

Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.

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: