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Hi
Michelle,
I'm
not sure about fluoride in Ti anodes but I did find reference on the internet to
the use of platinized titanium anodes. While platinum is very expensive,
the Ti provides strength and support so that only a thin layer of Pt is
required. In the aerospace industry, the High Velocity Oxygen Fuel (HVOF)
Thermal Spray process has been looked at as a replacement for hard
chrome.
If you
do switch anode materials, keep in mind that you might need to provide some
other means to control trivalent Cr. Lead anodes are attacked
and a layer of lead chromate (yellow-orange) forms when they are left in
the tank with the current off. When in use, the lead chromate
converts to lead peroxide (brown). Too much lead peroxide is harmful in
that it changes the physical size of the anode but some peroxide is good because
it reoxidizes the trivalent Cr to hexavalent Cr. This info comes from
Durney's "Electroplating Engineering Handbook."
Mike Callahan,
PE
Jacobs Engineering 1111 S. Arroyo Parkway Pasadena CA 91105 Business: (626) 568-7005 -----Original Message-----
From: owner-p2tech@great-lakes.net [mailto:owner-p2tech@great-lakes.net]On Behalf Of michelle gaither Sent: Tuesday, February 05, 2008 1:30 PM To: p2tech Subject: Alternative for Lead Anodes in Chrome Electroplating
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