Iron is a widely used metal, but it is prone to corrosion (rusting).
Name the two substances that must be present for iron to rust.
State the chemical name of the main compound present in rust.
Complete the table below by matching each prevention method with the most suitable object from the list. You may use each object only once.
List of objects:
| Method | Example of use |
|---|---|
| Painting | |
| Oiling / greasing | |
| Plastic coating |
Large steel (iron) structures, such as ship hulls, are often protected by attaching pieces of zinc to them. This protection works even if the zinc does not fully cover the steel surface. Explain how the zinc protects the steel from rusting.
