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

-----

Nitric acid passivation

2003

Does anyone know how much nitric acid, type VII you would need to passivate a 900 gallon stainless steel wash tank? I've been told to use nitric 3, Type VII, between 120-150F for a minimum of 20 minutes, is this correct?

What vendors would you suggest?

Thanks,

Rene Rogers
a bottled water company - Fort Worth, Texas, USA

Type VII in the old (canceled) QQ-P-35C (canceled) [link is to free spec at Defense Logistics Agency, dla.mil] requires 20-25% by volume of nitric acid, which would mean 180-225 gallons of conc. nitric acid. You can buy this from most chemical warehouses in your area. It is, VERY hazardous.

You can get BETTER results with citric acid formulations that are available and safe to use. Contact us if you need help.

Lee Kremer
Stellar Solutions, Inc.

McHenry, Illinois

2003

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: