What is another word for rust?

Here are some other words for rust, depending on the context:

General:

* Corrosion

* Oxidation

* Red oxide

* Iron oxide

* Ferric oxide

* Scale

* Verdigris (for copper)

* Tarnish (for silver)

Figurative:

* Decay

* Deterioration

* Disintegration

* Erosion

* Wear and tear

The best word will depend on the specific situation. If you're talking about the chemical process, "oxidation" is a good choice. If you're describing the appearance of rust, "red oxide" or "scale" might be more appropriate. And if you're using rust metaphorically, "decay" or "erosion" could work.