Remember that chloride (Cl^-1) is consumed in the etching process. That must be replenished by addition of HCl or something equivalent.
Whether the copper is oxidized to Cu^+2 can be determined by color. I just bubble air until all traces of brown/mud are gone as per Seychell's instructions.
John
Whether the copper is oxidized to Cu^+2 can be determined by color. I just bubble air until all traces of brown/mud are gone as per Seychell's instructions.
John
----- Original Message -----
From: poofjunior
To: Homebrew_PCBs@yahoogroups.com
Sent: Tuesday, May 08, 2012 9:39 AM
Subject: [Homebrew_PCBs] Long-Term CuCl2 setup
Hi everyone,
I noticed that a few people have mentioned regenerating a cupric chloride etching solution with a few options: aerating it with a fish pump, adding Hydrogen Peroxide, or even using some form of electrolysis.
Has anyone had any long-term success with this process? How long does it take to aerate? Is there any excess waste that needs to be dumped eventually? Are there any circuits I can create to duplicate an electrolysis setup?
I'd greatly appreciate more details on anyone's success or any insights on maintaining a CuCl2 solution for use over and over again. If I can duplicate a setup, or make my own, I'd be happy to write up a tutorial.
Many thanks in advance!
Sincerely,
Poofjunior
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