What Causes Metal to Rust?
What It Is
Rust is a type of corrosion that forms on certain metals over time.
How It Works
Rust forms when metal reacts with oxygen in the presence of moisture.
This reaction changes the surface of the metal.
Why It Happens
Water allows oxygen to reach the metal more easily.
This speeds up the chemical reaction that causes rust.
Why Some Metals Rust and Others Don’t
Iron and steel rust easily.
Other metals form protective coatings instead.
Common Examples
- Rust on outdoor railings
- Rust spots on tools
- Corrosion on exposed metal surfaces
What to Know Next
Rust weakens metal over time.
Closing Summary
Metal rusts because oxygen and moisture react with the surface, slowly breaking it down.
