http://www.peachparts.com/shopforum/showthread.php?t=113284&highlight=broken+springs

See link above. Seems to be a problem area. We have had a lot of snow and salt here in NY, I think I will wash out my lower control arm spring perch this weekend. I never really thought of this happening.

Your springs could also be defective. Did you get them from the dealer? They really shouldnt rust like that. I have Eibachs on my car and not a spot of rust on them.
http://www.peachparts.com/shopforum/showthread.php?t=64549&highlight=broken+spring