Perhaps under certain circumstances it may be possible to suggest a date by corrosion, but having spent alot of time with corrosion (during my conservation degree). It would not rely on it. It is so easy to corode something. That said, you can look at the type and depth of corrosion which may suggest if it is genuine or fake, things like intergranular corrosion and what form the iron oxide is in, and if there is any relic stuctures in corrosion products, these factors I believe usually occur during slow corrosion. I have some iron that has been in my garage for only a few years (old file I did not want my mom to toss out, but even in the garage after a short time, they have totally lost their shape. They are even too far gone for me to even attempt to conserve.
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