Anodic index

Anodic index is like a special list that tells us which metals are better and which are worse at becoming rusty. Rust is what happens when metal reacts with oxygen in the air and water.

On the anodic index list, the metals that are higher up will become rusty easier because they like to react with oxygen more. The metals at the bottom of the list are not as likely to become rusty because they don't like to react with oxygen as much.

For example, gold is a metal that is very low on the anodic index list. This means it does not become rusty at all because it does not like to react with oxygen very much. But iron is higher up on the list, so it can become rusty very quickly.

Knowing where different metals are on the anodic index list can help us choose which metals to use in things like pipes or machinery to make sure they don't become rusty and break down.