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Date: | Mon, 2 Dec 1996 19:48:42 -0500 (EST) |
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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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