17 Sep
1997
17 Sep
'97
12:34 p.m.
On Wed, 17 Sep 1997 08:39:02 -0700 Marvin <marvin(a)rain.org> writes:
David H Quackenbush wrote:
I don't think that the concentration of phosphoric acid in these
cleaning products presents any danger to PC boards, they are also used to
de-lime drip and perc coffee makers. Usually white vinegar will suffice
or even a can of Coke or Pepsi, but then you have to wash the board with
water to get the sugar off of it. :)
Muriatic acid is a good choice when the other products don't work, it's
inexpensive and as you said; easy to dilute and won't gobble up the other
parts on the board.
Regards, David Q. dhq(a)juno.com
Hi,
You might also want to try a product like "CLR" (calcium, lime and
rust
remover), it and products like it contain
glycolic and phosphoric
acids.
It works a little slower than Muiratic acid, but
it's much safer.
BTW:
Phosphoric acid finds its' way into many of
our food products from
cola
drinks to bread.
I'm not familar with glycolic acid but something in the back of my
mind says
that phosphoric acid will attack either the copper or the solder. My
primary concern is to remove the battery residue without doing any
additional harm to the circuit board or components. Since you mention
safety, I am *assuming* in this whole discussion that the user if
familar
with how to handle this stuff safely. The reasons I only use *drops*
of the
muriatic acid are 1) you don't need much more than a few drops to
neutralize
the residue, and 2) it is safer to use since if spilt, a small amount
of
water will dilute it to the point where it is not hazardous. Good
point to
mention though!