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Copper chloride without H2O2-adding? Answered


I think i will see some PCB-Etchin in the future... So i will need an etchant. Aequous copper chloride was the choice i made since it is a regenerative etchant according to several sources.

Now if i understood the chemistry right (Sorry... electrotechnician here), the reaction in theory only needs the oxygen from the peroxide (H2O2) and the hydrogen isnt used at all?

Since i only have relatively weak peroxide, i plan on using a bubbler to introduce the oxygen to the copper-HCI-mix. This because i dont want to dilute the acid too much...

Will that work?
I know that if i use normal air (which has only around 20% oxygen in it) it will take some time... But would it work in the first place?

I read somewhere that copper and muriatic acid dont really react in the first place...
So if i also understood that right, it needs the oxygen present in the beginning to START reacting... So i think i may go with a contraption like:
  • Plastic container with a bubbler installed (Pumps normal air)
  • Add Muriatic acid to the container
  • Add copper to the acid
  • let it bubble till the copper is disolved

Now i have a copper chloride-solution which i can regenerate by adding oxygen (By bubbler or H2O2)?


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8 years ago

You only need hair-dresser strength peroxides. They're easy to buy.


Reply 8 years ago

3% is enough? i can find up to 35% online but they wont ship to non-EU-Countrys...
And 3% is what i found in Switzerland...

Also what made me think is the PRINCIPLE of creating CuCl2 without added H2O2 int he first place. Call it a chemical experiment... :)

If i understood it right, the solution uses chloride + oxygen to disolve copper and oxidizing it from Cupric chloride to Copper (or Cuprous?) chloride.
So in my simple minded theory it SHOULD be possible to start with Cu + HCl and a bubbler to supply the oxygen from the air...
THATS the question here... :)
Sorry if i didnt wrote that clear enough... English isnt my language... ;)


Reply 2 months ago

3% is more than enough. though 30% makes reaction go a lot faster