Homebrew PCBs

--- 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