Can astatine react with iron?
I think yes it can react, if the iron is very hot. It may form Iron(III) Astatide = FeAt3
Pure Iron (Fe) doesn't directly react with water, but it will oxidize (rust), especially if the iron is just wet and is exposed to air a lot. I believe iron will eventually oxidize if kept completely underwater too, but as there is less free Oxygen for it to react with down there, it is a longer process.