Corroding is erosion by chemical action, to keep it simple.
The answer is Aluminum (Al)
Yes, corroding metal is a chemical change because it involves a chemical reaction between the metal and substances in its environment, such as oxygen or water. This reaction causes a change in the composition and properties of the metal.
If your talking about granite that has turned yellow with age, it is the minerals corroding.
All except the corroding of iron do NOT change the substance involved.
Slowly, because the zinc galvanizing coating must corrode away almost completely before the iron can begin corroding.
Usually you have to stop it corroding FIRST, then paint it to protect it.
Rusting
The metal is getting rusty!
(adj.) - capable of burning or corroding by a chemical action; sarcastic, biting
to stop is from corroding!...
THERMITE
Corroding
chemical
KEEPS OXYGEN FROM COMING INTO CONTACT WITH THE IRON.
Galvanized means coated with zinc.
If you mean the grease in the plug of the tail lights it is to prevent them from corroding.
The answer is Aluminum (Al)