); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Brooke Clarke wrote: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] > > Hi Didier: > > Would you elaborate on the comment "Gold plated connectors are a well known > example." Do you mean when soldered with Lead Tin solder instead of a silver > bearing solder or something else? > > Have Fun, > > Brooke Clarke > http://www.PRC68.com > http://www.precisionclock.com > > > > Didier Juges wrote: > >> ); SAEximRunCond expanded to false >> Errors-To: [EMAIL PROTECTED] >> >> I have seen cold solder joints on thermal fuses and certain types of >> capacitors, while the rest of the instrument was fine with no sign of >> corrosion. >> >> I think it has to do with the metal used for certain component leads. Either >> they were never soldered well, or interface corrosion developed over time. >> >> Gold plated connectors are a well known example. >> >> Didier KO4BB >> Brooke
Gold dissolves in the solder and a gold -tin intermetallic compound is formed which severely reduces the joint integrity and ductility. This can be circumvented by keeping the gold concentration in the solder below 4%. Tin plating over the gold before soldering is sometimes used to ensure this. Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
