Corrode Metal

You touch a piece of iron or iron alloyed metal that is no larger than 3 cubic feet. If the metal object is stationary, it instantly rusts and crumbles to dust. If the targeted metal object is armor worn by a hostile creature, you must make a melee spell attack to see if this spell takes effect. If you target a metal weapon held by a hostile creature, you make a melee spell attack at disadvantage. This spell does not affect magical objects.