It is my understanding you tin plate the pcb after etching to
protect the new copper trace from corrosion. TINNIT is the name of
the material used to tin plate.
--- In
Homebrew_PCBs@yahoogroups.com, "Stefan Trethan"
<stefan_trethan@...> wrote:
>
> On Mon, 27 Mar 2006 17:50:06 +0200, matt clement
<buckeyes1997@...>
> wrote:
>
> > I saw a process used by a fab house and they used a negative
photo
> >
> > resist and then tin coated the board. The tin only stuck to the
> >
> > places that had the bare copper. Then the board was chemically
etched
> >
> > and the tin protects the copper. Would we possibly be able to
come up
> >
> > with a similar system of printing a negative image and then tin
> >
> > plating before etching? The toner would probably melt when you
tried
> >
> > to tin the board with an iron, but maybe a chemical plating
process?
> >
> >
> > Does anyone know for sure if tin etches away with FeCl? I might
have
> >
> > to try it at lunch...haha.
> >
> >
> > matt
> >
>
>
> I'm not sure about FeCl, those tin resist baths are usually
Sulphuric acid
> / peroxyde i think.
> You could do things that way, but why do you want to?
>
> ST
>