[sdiy] Lead-free DIY

[Magnus Danielson]

From: karl dalen <dalenkarl at yahoo.se>
Subject: Re: [sdiy] Lead-free DIY
Date: Sun, 10 Oct 2004 05:20:35 +0200 (CEST)
Message-ID: <20041010032035.97169.qmail at web53505.mail.yahoo.com>

>  --- Magnus Danielson <cfmd at bredband.net> skrev: 
> 
> > However, the Sn-Cu-Ag seems to be more in use when I
> > scan the world (let it be right or wrong), so it then becomes the Sn-Cu-Ag-Pb
> > mixtures which is of interest.
> 
> The reason is , there is still Pb in use thereof the non Bi mixtures,
> if we,ie them manufacturer, entierly remowe PB then Tin-Bi mixtures would
> be superior. Thereof the problems the industry have, higher soldering
> temperatures wich stresses everything!! Urgh! 

Yeah, ok.

How about this then (if we could wish): Sn-Cu-Ag platings and Sn-Bi solder.
Sn-Cu-Ag plating would not obscure traditional Sn-Pb or Sn-Pb-Ag solders and it
will mixture well with Sn-Bi (to the best of my knowledge). For both kinds of
solders the Sn-Cu-Ag would quickly disolve into the Sn-Pb, Sn-Pb-Ag or Sn-Bi
solder. The assumption being that the plating content of the final solder joint
is relatively low. The Cu trace will be noticeable, but should not increase the
level very much. It would be interesting to know if Cu-Bi forms any strange
(fragile) mixtures as the solder cools off.

Some of this should be a matter of digging in the ref-books.

> > Where's my Metalurgy-DIY handbook when I need it?
> Not where we want it to be!!

Sadly not :(

Cheers,
Magnus