does iron tarnish? Like iron keys, etc...?

Answer 1

I don't think the correct term is tarnish, but the word rust is. Tarnish effects other metals and does less damage or it takes longer to do a lot of damage. Rust does it's damage real fast.

Answer 2

We found this corroded gun laying on the beach in between some rocks. The trigger guard was intact when we found it. We took it to a gun shop, but they were not able to identify it. Other than to say it was a revolver.
Recently when we were going through our big can of finds, I picked it up and it crumbled in my hand. It must have been made of iron? When it totally fell apart, we looked for bullets, but none were to be found.

Yes iron definitely rusts. Silver and 10k gold tarnishes, most old keys were made of brass.

http://gometaldetecting.com/oldgun.htm

Answer 3

If you mean that it rusts, then yes. Over time when iron is exposed to oxygen and water, it undergoes oxidation, or a layer of iron turns to rust. If you try to chip it of or it wears off, more rust developes and then that layer wears away and over and over. Eventually the object will be so rusted and eroded that it will be gone, but only after many years. Bluing is a technique that can provide limited resistance to rusting for small steel items. For it to be successful, water-displacing oil must always be rubbed onto the blued steel.

Answer 4

Iron rusts.