Remember that technically only iron and alloys that contain iron can rust. Compared to the corrosion of other metals, iron rusts relatively quickly, especially if it is exposed to water and oxygen. In fact, when iron is exposed to water and oxygen, it can begin to rust within a few hours.

Does iron corrode or rust?

Figure 1. Rust is the result of corrosion of metallic iron in an environment containing oxygen and moisture.

Does iron always rust?

The terms "rust" and "rusting" only mean oxidation of iron and its resulting products. ... But only iron or alloys that contain iron can rust. However, other metals can corrode in similar ways. The main catalyst for the rusting process is water.