Hi Bev! Cool, a metallurgy question to start the day with! German silver is
a copper based alloy with its major alloying elements being zinc and
nickel. There is no silver in the alloy but the nickel and zinc additions
give the metal a silvery appearance. German silvers are classified as C7xx
series alloys per the Copper Development Association (CDA). If you
websearch on CDA you will find more information. One of the major uses of
German silver is for jewelry and optical goods for the same reason you
generated your question - the alloy can be oxidized to various shades of
silver-to-goldish for appearance characteristics. I have also found that
many of the ceramic filter component fabricators use the alloy as a case
material which can lead to less than wonderful solderability issues if the
fabricators don't get good solder coverage. Hope this helps - I need to go
find a Coke and a donut.

Dave Hillman
Rockwell Collins
[log in to unmask]



                      Bev Christian
                      <[log in to unmask]        To:       [log in to unmask]
                      ET>                      cc:
                      Sent by: TechNet         Subject:  [TN] German Silver
                      <[log in to unmask]>


                      03/12/2003 06:57
                      AM
                      Please respond to
                      "TechNet E-Mail
                      Forum."; Please
                      respond to Bev
                      Christian






TechNetters,
Have a met. question for you.  Is there a slightly different composition of
the above-named material that would make it go yellow after seeing one
normal reflow?  No, the color is NOT flux residue.

regards,
Bev Christian
Research in Motion

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