Do you need to protect exposed or cut edges from corroding? 

The answer is NO. The steel is galvanized coated with zinc which provides cathodic corrosion protection to the underlying steel as well as any exposed edges from manufacturing and/or field cuts. This is the best type of corrosion protection, where the zinc coating will sacrificially corrode before the steel does. You may see a rust appearance over the cut edge but you can be confident that the steel will not corrode. This is in compliance with the industry specification AISI S200.