In The Wonderful Wizard of Oz, Dorothy Gale befriends the Tin Woodman after they find him rusted in the forest, as he was caught in rain, and use his oil can to release him.
A recurring problem for the Tin Woodman in The Wonderful Wizard of Oz and afterward was his tendency to rust when exposed to rain, tears, or other moisture.
This is inaccurate, in that tin does not rust; only iron does. This may reflect the usage where an object made of iron or steel but coated with tin (in order to prevent rusting) is called a "Tin" object, as a "tin bath", a "tin toy", or a "tin can"; thus, the Tin Woodman might be interpreted (in English, at least) as being made of steel with a tin veneer.