Let's try this again. (Ouch!)
> 
> Ooooops!!!  That was really informative.
> > 
> > > 
> > >      Has anyone heard of problems with seating a tin/lead leaded part into 
> > >      a gold socket?  
> 
> Yes, fretting corrosion is a problem with gold-tin/lead contacts.,
> especially if mechanical vibrations are present. Fretting corrosion
> will cause an increase in contact resistance.  What happaens
> is the tin forms an oxide film that mechanically breaks down
> with vibration, allowing the newly exposed tin to form
> more oxide.  The broken oxide layers that build up degrades
> the contact.  The presence of a gold-tin/lead couple exacerbates
> the problem, so that gold/tin-lead is much worse than tin-lead/
> tin-lead.  This problem was discussed on Tech Net before.
> 
> >>       I have heard concerns that the gold will migrate into 
> > >      the tin/lead even though it is only a mechanical connection.
> > 
> 
>  suppose a little gold may migrate into the tin/lead, but that 
> is not the problem in this case.  With gold plate directly over
> copper (i.e. without Ni in between) the Cu will migrate into 
> the Au plate, and lead to contact degradation.
> -- 
> Karen Tellefsen
> [log in to unmask]

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