Letter 42068

Passivation of Phosphorus Bronze  

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Hi all,

Does anyone have any experience or ever heard of passivating phosphorus bronze per ASTM A967 [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 Brick, New Jersey

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, New Jersey

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