On Sat, 23 Mar 2019 16:29:17 -0500, you wrote:
I hafe to add my experience with aerating etching solutions.? I had a tank using ammonium persulfate.? I etched in a closet in my carport.? After a dozen or so, i looked and the heads of all the nails were missing.? Aerosolizing etchant is not a good idea and it can grt anywhere.? I use HCl + H2O2 + H20.? Ru;er gloves, rubbing the boards and 5 to 10 minutes later im done.? It takes me less than 1/4 cup of etchant to do a board.? HCl is cheap at Lowe's and 35% H2O2 is readily available from Amazon.I never liked FeCl.? Too thick and the sludge buildup kept the etchant away from the board.I woufd suggest a water pump over aeration.? I have also seen bubbles protect the copper from the etchant.Sent from my T-Mobile 4G LTE Tablet
I'd wonder if the average water pump can handle corrosive solutions.
I've not seen any except the peristaltic pumps, which you could make
yourself, I suspect.
FeCl I've used for a long while at the beginning of my career (in
etching boards, that is....), and it is quite thick and sludgy...
however, you need to heat it and keep it moving.
Aeration will do that, as well as help the etchant when it turns to
CuCl plus sludge.
Harvey
