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Trivalent Passivate Over Aluminum Dissipates within 60 days after application?

I was just informed that the trivalent passivates over aluminum dissipate within 60 days.
Has anyone heard this before?

Dan Kovar
Supply Quality Manager - Anoka, MN, United States
September 21, 2009

September 21, 2009

Hi, Dan. It depends on exactly what "dissipate" means to you. Trivalent chromates cure, dry out, wear off, etc. But are they rendered useless in 60 days, no, of course, not.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

After the RoHS implementation we are all sensitized to assure non compliant chromate is not present on our product. A steel manaufacturer has tauted that hexavalent is ok to use since over time it will the CR6 and no longer detectable.

Dan Kovar
Our steel products are zinc plated and aluminum is chromate treated - Anoka, MN, US
September 21, 2009

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