Permanent and corrosion proof don't really exist. Bad news, while 316 does better against chloride attack than lower grades, the chlorides in salt eventually attack 316SS.
"Chloride attack of austenitic stainless steels, like 316, occur in three ways: stress corrosion cracking (SCC), pitting corrosion, and crevice corrosion. SCC is usually not a problem in the temperature range you have described. Pitting corrosion is associated with stagnant conditions and usually not an issue where continuous flow is occurring. Crevice corrosion can be minimized by eliminating crevices through proper design."
Unfortunately, a bike can have both stagnant conditions and crevices.
You also will eventually get corrosion of the aluminum parts, and of course, steel such as the cassette, steel axles, bearings, etc.
Last edited by wrk101; 07-01-11 at 04:43 PM.