Most if not all the UOA's for oil at 1 year or longer Ive seen showed corrosion wasnt an issue on the engines and brands of oil that were tested. But with all the variables to this type of thing like oil brand, engine condition, driving & storage conditions, etc, there really is no way to get a definite answer, all we can go on is what works over long periods of time, and of course UOA results like this one...
https://www.youtube.com/watch?v=T-yt5a1cWd4
These arent exactly controlled scientific tests but gives a good idea of certain things like wear or pour rates, this guy does tests for all kinds of things related to oil and engines, but his test on 17 month old oil with high miles vs new oil show identical results on the wear test and very close on other tests. But the samples he sent are what supports what Im saying, every part of the results showed the oil was perfectly fine, even the TBN numbers were excellent. Based on UOA's, personal experience & tests like this one I have zero concerns using 1 year old clean low mile oil in my expensive engines or daily drivers.
Projectfarm also has a cool test with 2 or 3 new small engines, one with oil, one treated with STP & one treated with... Lucas
he drains the oil and lets them run until they blow up! The one treated with lucas lasted the longest, and not by a small amount, it ran for ~10 minutes more!