Hi Bill

Yes, it is quite possible to expose intermetallics when removing the excessive solder and yes it is the most normal thing in the world that these intermetallics won't be wetted by the solder. If you do rework you must either leave the solder on the pad or remove the intermetallics with a glass brush. Bob Willis knows a lot about that.

Best regards

Guenter

Guenter Grossmann

Swiss Federal Institute for Materials Testing and Research EMPA
Centre for Reliability
8600 Duebendorf
Switzerland

Phone: xx41 1 823 4279
Fax :      xx41 1823 4054
mail:     [log in to unmask]

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