--- In
Homebrew_PCBs@yahoogroups.com, "mumin55555" <MUMIN55555@H...>
wrote:
> i am making a lot of pcbs but after a while they oxidize
(corosion).
> i couldnt find any flux on electronics stores (here in israel i
> could hardly find copper boards). is there someplace alse where i
> can get something to prevent corosion????
I have achieved good results with Tinnit (DATAK) tin "plate". The
stuff (shipped in powder form) dissolves in warm to hot water and
works best when hot (140F). You immerse the freshly etched/washed
board into the tinnit mixture and within a few seconds, all the
copper turns a silver color. You are supposed to leave the board in
for 10-30 minutes. After plating, it is suggested to thouroughly
clean the board with a mild solution of household ammonia to remove
all traces of the plating solution. The name of the material would
suggest tin plating, but there is no electro-plating process. I'm
not entirely sure what it is, but I have yet to have one of my boards
(treated with this stuff) corrode.
You can also use a lacquer spray to paint/protect the board after
assembly to prevent corrosion. I used to use a clear coat of MG
Chemicals Conformal Coating, but I believe it is simply clear acrylic
Lacquer.
Good luck