On Monday 03 March 2003 12:06 am, rolanyang <
rolan@...>
wrote:
> I had a chance to play around with some CuCl2 (Cupric Chloride)
> etching last Friday and performed a test etch with a small segment
> of PCB created using the "cheap paper laser toner-transfer method".
> The traces are 10 mil in width.
>
> You can see check out some pics at
>
> http://www.techfreakz.org/~rolan/mypics/cucl2/
>
> The neat thing about using CuCl2 is that the byproduct
> of the etching process generates more CuCl2. And because of
> this, the etchant solution can be used over and over.
No, the etching reaction (a reduction reaction) generates CuCl .
Cu + CuCl2 => 2 CuCl
People do regenerate the etchant using oxidizers (like chlorine gas or
hydrogen peroxide).
2 CuCl + H202 + 2 HCl => 2 CuCl2 + 2 H2O
2CuCl + Cl2 => 2 CuCl2
--
Ned Konz
http://bike-nomad.comGPG key ID: BEEA7EFE