well, nobody seems to have an idea so i did a small experimant.
used 2 glass containers, same size, etchant, same amount in both from the
same batch.
then 2 samples of pcb, you guess it, identical.
heated some water and put one glass in it.
bad thing didn't check boiling point of HCl before --> nasty HCl fumes.
the temperature of the water was 60degree C. boiling point of HCl is
around 50C.
after i have found that out i diluted the heating bath to 45C. (about
halfway
through the etch)
the etching was of course much faster, 15min or so (without adding any
H2O2,
the etchant was regenerated 2 days ago and 1 pcb etched, still light
green).
now it is about 40 minutes and the cold etchant only starts to show the
edges come off...
You see it is really much faster but the HCl fumes are BAD.
i will try again, maybe with 40C or so.
If the process can be accelerated without the fumes it would certainly be
interesting.
any discussion welcome..
ST
>
> What effect has heating on CuCl etchants?
>
> Both, H2O2 and air regenerated are interesting to know.
>
> i would assume it may be faster, but have no idea if it will also
> encourage gassing if using H2O2.
>
> thanks
>
> ST