Glib answer, keep them sharp, use them often.
Serious answer:
If they are modern tools they will be High Speed Steel, and as long as they are kept in a dry place should not cause any problems.
If they are the older Carbon Steel tools (I still have a few Skews like this) then yes, a damp atmosphere (e.g. garage in wintertime) may be a problem. The as John says, WD40.