Well, I think it isn't so much corrosion as abrasion, when you ride in winter the chain picks up all sort of crap, and so the answer is more frequent cleaning an oiling, but since chain is so cheap,I always just measure the wear in the spring (early April) and change out the chain when it's too worn.. On a recumbent I was getting 8,000 miles per chain when I ride year round and 12,000 miles if I hold out for fair weather. So, enclosed chain will keep out the problem, but is it worth it on your bike?