hi adam!
i initially thought of getting copper OUT not IN to aid in regenerating the echant without adding hcl
(and stopping it growing).
have you also some ideas on that?
what would happen if someone starts electrolysis? would the copper(II) plate itself down on the
electrode?
I only annoy so much with this topic because i have read of electrolysis used in either ferric cloride
or the other common etching solution, i can't remember. There was sayd that the copper is displaced on
the electrode and can be simply pulled of or if using a foil disposed. i also remember it was mentioned
to put in some (very little) sulphuric acid to assist not only in etching but also in electrolytical
disposal of the copper.
I would very like the idea of getting the copper off the pcb and then disposing it as hard copper
somewhere.
regards
st
17.04.2003 04:21:32, Adam Seychell <
adam_seychell@...> wrote:
>Electrolysis would certainly get copper in solution. The solution
>may need agitation to minimize chlorine gas evolving at the
>copper anode. When the copper gets high it will want to plate on
>the cathode, along with hydrogen. This usually produces a growth
>of copper sponge. You can stop copper ions reaching the cathode
>by a porous wall, such as a earthenware garden pot suspended in
>the middle of the bath and the cathode inside this pot. Hydrogen
>ions have much greater ionic mobility than copper(II) ions and
>will readily pass through the electrolyte absorbed ceramic wall.
>I've prepared sulfuric acid / stannous sulfate a similar way for
>a tin plating tank.
>
>Assuming 100% electrode efficiency, then to dissolve 1 kg of
>copper metal requires 840 amp-hours, (e.g. 10 amps for 3.5 days).
>
>Electrolysis is not fast, and not easy as to setup.
>
>
>Jan Kok wrote:
>> Just some brainstorming from someone who is not very knowlegeable about chemistry:
>>
>> Would electrolysis speed up the dissolving of the copper and getting the reaction you want? Just
pass 6.3VAC (more or less, to suit your taste) between two copper electrodes. You get gaseous oxygen
(which you apparently want) during part of the electrical cycle, and hydrogen in the other half (so
watch out for explosive gas mixture!).
>>
>> Cheers,
>> - Jan
>>
>>
>
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