I don't know of any, but it shouldn't be that hard to make one of your own.
Just use one of the existing dragons (chromatic if it is evil, metallic if it is good), and fiddle with its appearance, breath weapon, and spells. Presto!
I suppose it would technically be a metallic dragon, but of all the metals, iron is most associated with violence and bloodshed. i.e. the golden rule is charitable altruism: "do unto others as you would have them do unto you" but the iron rule is pre-emptive retaliation: "do unto others as they would do unto you- but do it first!"
So I'd use a chromatic dragon as a base. Electricity would be a good breath weapon. For spells, Rusting grasp, wall of iron, some kind of magnetic themed spell. Repulsion, maybe. Or reverse gravity.