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Reduction of Hexavalent Chromium to Trivalent by bubbling air





May 19, 2010

I have seen a business bubbling air into their final rinse tank in their chromate conversion coating process (immersion in tanks). They tell me this will convert the hexavalent chromium to trivalent chromium. This allow cheaper disposal to sewer.

Does anyone know if this will work?

Evan Miller
plating shop employee - Springwood, QLD, Australia



May 19, 2010

Hi, Evan. The air bubbler is for agitation, not for reduction of hexavalent to trivalent chromium. It won't work. If it did work, there would be no hex chrome in their chromate conversion coating tank :-)

Regards,

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



May 19, 2010

I would expect air to oxidize the trivalent to hex.

James Watts
- Navarre, Florida


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