Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
If metal corrodes, or if something corrodes it, it is slowly damaged by something such as rain or water:
to destroy or be destroyed, esp. by acid or rust, usually over a long period of time: