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Making PCBs
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February 3rd 04, 12:56 AM
Dr. Grok
Posts: n/a
In article ,
wrote:
Dick wrote:
Thanks to the group for all the past advice given on PCB
drafting software & UV exposure boxes, it's all being put to good use.
In the past I've used ferric chloride professionally as my
etchant (and left disposal of the etching solution to the work's
chemist) but now I'm doing things for myself safe disposal is going to
be my problem, searching on the web for an answer ammonium and sodium
persulphate come up as a suitable alternatives but not ones I've used.
Does anyone have experience of using persulphates as a D-I-Y PCB etchant
? Are they as good as ferric chloride, are there any problems with using
them & how easy is it to dispose of the spent solution ?
It's just as easy to dispose of as FeCl3. The solution doesn't keep very
well, unlike FeCl3.
Leon
Use CuCl2 + HCl. After etching the Cu 2+ (cupric) ion goes to Cu 1+
(cuprous). Bubbling air thru it oxidizes the cuprous back to cupric [you'll
know when its done because the cupric is a bright emerald green]. Disposal is
easy -- you don't dispose of it, just reuse.
Do a Google search for CuCl2 and PWB etching and you can find more details.
Dr. G.
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