Hi Ben,
Actually, it has never been proven that Sn62/Pb36/Ag2 prevents leaching on 
components finished with silver—it appears to sound reasonable, but is an urban 
myth.
Sn62/Pb36/Ag2 is somewhat stronger [which is totally without practical value—
and the still stronger SAC-solders cause pad cratering] than Sn63Pb and has a 
slightly lower Solidus/Liquidus temperature. Creep-fatigue-wise there is no 
significant difference.

Werner
Future workshops:
Reliability Issues with Lead-Free Soldering Processes, September 22, 
Schaumburg
Failure Mode and Root Cause Analyses Reliability (Fatigue, Brittle Fracture, 
ENIG), September 22, Schaumburg
Solder Joint Reliability: Parts 1 & 4, Oct. 9, Moscow, Russia
Solder Joint Reliability: Part 4, Oct. 17, Timisoara, Rumania
Solder Joint Reliability: Parts 1 & 4, Oct. 22, Tallinn, Estonia



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