Rust

Rust is that flaky brown stuff you see on old metal. It forms on iron or steel that is left outside. Rust happens because of oxygen and water in the air. Over time, rust can weaken metal objects.

How Rust Forms

Rust needs three things: iron, water, and oxygen. When they meet, a slow chemical reaction begins. The iron combines with oxygen to make iron oxide. Iron oxide is the real name for rust. Salt in the air or on roads can make rust happen even faster.

Stopping Rust

People use many tricks to keep things from rusting. Paint covers metal so oxygen can't reach it. Oil and grease work the same way. Some metals like stainless steel are mixed to resist rust. Keeping things dry is the best way to prevent it.

Fun Facts

• Rust is weaker and flakier than the original metal.
• Stainless steel has chromium in it to stop rust.
• A rusty nail feels rough and looks orange-brown.

Did You Know?

If you leave a bike outside in the rain for too long, the chain can rust and make it very hard to ride.