Alloy 42 is a Nickel/Iron Alloy developed for among other reasons, it's
electrical properties in conjunction tensile/ductility. When cleaned
properly Alloy 42 should solder without any problems. One of the most
common causes of solderability failure in this alloy is the use of
non-evaporating oils during stamping/forming. Once trapped in this alloy
it is almost impossible to remove. Non-evaporating oils contain a large
amount of chlorine and sulphur both of which will wreak havoc if not
properly cleaned.

Hope this helps...

Franklin

Ron Waugh wrote:
>
>      Technetters,
>
>      I have a huge problem with the wetting and solderability of a fine
>      pitch 15 mil QFP.  I then spoke with the solder supplier; which
>      requested a couple of the components and performed x-sections.  During
>      the x-sections, they also performed a metal composition of the
>      components lead.  The metal in the leads turned out to be alloy 42,
>      which is ....non-wetting???? ...."or so I'm told".
>
>      I really don't know much about metals but the solder supplier stated
>      that the component will never wet properly.  I would really like to
>      get some literature on this alloy 42 and ask if anyone else has had
>      any of these problems and what was their fix.
>
>      Thanks in advance for your time and energy.
>
>      Regards,
>
>      Ron Waugh
>      Process Engineer
>      Diversified Systems, Inc.
>      Phone: (317) 299-9547 Ext. #336
>      Fax:  (317) 298-2055
>      Email: [log in to unmask]
>
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