re:PbO2 electroplating weirdness
From: rpweaver (h3weaver_at_h3rockets-dot-com.no-spam.invalid)
Date: 07/31/04
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Date: 30 Jul 2004 20:49:59 -0500
Ti is a very reactive metal. Like Aluminum and Magnesium, it survives
by developing a tough oxide surface coating. This coating can get
tough enough to block electrical flow. This is what happened. Anodic
polarization, like in anodized aluminum, makes the coating stronger
to a point. That point is around 10v. After that, it breaks down and
the Ti will begin to dissolve/erode away. I don't know why it happens
at the surface but I had the exact same thing happen to my first
attempt to put PbO2 on Ti.
You need to coat the Ti to prevent the oxide coating from forming
while you plate the PbO2. This will keep the current flow high so you
don't have to resort to voltages anywhere near 10v. You can coat the
Ti with Pt. You can also coat the Ti with Tin/Antimony solder
dissolved in HCl. You must clean off the oxide first to provide a
good conductive surface. Then after applying several coats and
letting them dry or forcing them to dry, you need to decompose the
Tin/Antimony chloride...I use a light touch with a propane torch.
Watch for a color change in the coating but don't let it get red hot.
Then you wash off what is left with distilled water. Now you can plate
the Ti.
Rich Weaver
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