On Sun, 8 Apr 2018 13:52:44 -0400, you wrote:
>What do you mean by
>" If you are doing the copper chloride bit"
>
Peroxide/hydrochloric (muriatic) acid works well until the oxygen
provided by the peroxide runs out. The remnants are copper chloride
(CuCl). It will not etch a board by itself (Ferric chloride does
this, eventually, I think). However, by bubbling air through the
solution, the extra oxygen will allow etching. Perhaps a bit slower,
but it does etch. This particular solution has an indefinite life,
but needs to be adjusted every now and then for additional acid.
Adding peroxide simply goes back to the original solution if you add
enough.
If you look at the etching process in a clear solution, you will see
the copper turn dark in waves, this is the copper being oxidized by
the etchant.
Harvey
>
>
>
>
>On 04/08/2018 12:03 PM, Keith B kabowers@... [Homebrew_PCBs]
>wrote:
>>
>> For single use the 3% just adds more water.
>>
>> If you are doing the copper chloride bit
>> the 3% tends to add too much water and over
>> time upsets the chemistry.
>> I'm a newby, I've only been using my original
>> batch of CuCl for five or six years.
>>
>> On Sun, 8 Apr 2018 00:22:51 -0400, you wrote:
>>
>> >So what is the advantage of using 12% peroxide instead of the drugstore
>> >3% peroxide?
>> >
>> >I use 50ml of muriatic acid mixed into 100ml of drugstore peroxide.
>> >All of my etching is done in about 4 or 5 minutes.
>> >
>> >http://www.learnmorsecode.com/laminator/hotcakes.html
>> >http://www.learnmorsecode.com/ch/index.html
>> >http://www.learnmorsecode.com/DC/index.html
>> >
>> >Rob KB3BYT
>> >
>> >On 04/07/2018 05:22 PM, Keith B kabowers@... [Homebrew_PCBs]
>> >wrote:
>> >>
>> >> Look for clear hair bleach. I think it's around 12% (40 deg. Baume?);
>> >> strong enough to burn your bare hands.
>> >> I understand janatorial supply shops have it even stronger, but it
>> >> starts to get dangerous and these days may find the police checking
>> >> you out.
>> >>
>> >> I got mine from the local Sally Beauty Supply.
>> >> In this part of the US they seem to show up
>> >> near WalMarts.
>> >>
>> >> On Fri, 6 Apr 2018 21:45:00 -0700, you wrote:
>> >>
>> >> >Copper clad board using muriatic acid would like to find better
>> than 3%
>> >> >hydrogen peroxide if possible. In the usa LA california to be exact.
>> >> >Also what are some of the better methods of making a pcb cheaply
>> >> >BTW if needed I have 99 uv led on a circuit board built that a
>> while ago
>> >> >just would need a cheap uv kinda etch resist suggestions welcome
>> there.
>> >> >terramir
>> >>
>> >> ---
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>> >> http://www.avg.com
>> >>
>> >>
>>
>>