I don't understand what you are trying to do but I do have experience
soldering aluminum.
I never use anything other than the flux that I normlly use for
soldering electrical connections to avoid tool contamination.
The iron you use needs to supply enough heat to get the aluminum above
the melting point of solder. Rub the iron with some force to abrade the
aluminum oxide layer on the work WHILE applying a little solder to the
work. Once you get it tinned with a little solder you can connect to it
normally. Of course it does not hurt to clean up the aluminum with a
bit of scotch bright first, but the oxide layer forms fast.
It takes a little practice, I suggest a soda can for practice.
--- In
Homebrew_PCBs@yahoogroups.com, Rogerio F Cunha
<rogerio.cunha@...> wrote:
>
> Hi list,
>
> Hello List,
> Anyone has a idea how to produce a aluminium pcb over a virgin
aluminum
> board?
> I'm looking a way to home brew a pcb to solder some power leds that
are
> very sensitivy to thermal dissipation.
> By what I've seen, the companies applying some kind of metal deposit
over a
> virgin aluminium board, to permit soldering.
> Thanks.
> Roger.
>
>
> [Non-text portions of this message have been removed]
>