Which new material that is corrosion resistant can replace iron and be used in construction or development of other structures?

You have a number of choices. The simplest would be iron with a corrosion resistant coating such as paint. and by corrosion resistant I’m assuming you mean oxidation resistant.

Otherwise you have stainless steel or aluminum. Depending on your requirements you also have plastics and resins, but typically these get expensive and may not have the aesthetics for which you would be looking.