Despite being one of the most common and useful materials manufactured materials in the world, steel has always had one major flaw. It rusts. We often see the dark brown or red color and flaky material on old bridges, old buildings, and on steel that has just been left out in the open for too long. Steel isn’t the only metal however that rusts. Just take a look at any pennies you have laying around, any silverware you have, or pictures of the Statue of Liberty. Zinc, nickel, copper and aluminum and many more metals are also subject to the corrosion chemical reaction. Why steel rusts in the first place, why some steel rusts and not others, and why steel doesn’t rust in certain situations makes for an interesting topic.