Letter 42068

Passivation of Phosphorus Bronze [New Jersey] 

August 29, 2006

Hi all,

Does anyone have any experience or ever heard of passivating phosphorus bronze per ASTM A-967 [link is to spec at TechStreet] or QQ-P-35C [link is to spec at TechStreet] ? Usually this is only on stainless.

Thanks in advance,

Bernard R. Negrin
PMF - Linden

It doesn't sound right to me, Bernard. Copper, brass, and bronze can receive a chromate conversion coating, however -- which is often called passivation. Any chance this is the origin of the question?

 
Ted Mooney, P.E.
finishing.com Inc. - Brick, NJ

Hi!

Thanks for responding! I have a customer whose drawing states passivation ASTM A967 or QQP35. But the parts are made of phosphor bronze.

I told them that passivation to those specs are only for stainless and we would not be able to certify to them.

They emailed a copy of the Metal Finishing Guidebook section for "Chromate Conversion". So, I think they are confused as to what passivation is.

Bernard
Paramount - Linden, NJ, USA

I want to answer or follow-up on this subject publicly (in non-commercial fashion).

 

My company is a supporting advertiser at finishing.com and we want the contact information to reach the inquirer privately.

 

I want to post a new question or inquiry of my own on a different subject.