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] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************