Homebrew PCBs

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

  ----- 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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