Iron and different forms of iron are highly susceptible to chemical reactions and their protection from rust costs billions of money annually across the world. Corrosion under atmospheric conditions is extremely complex and the outcome of corrosion is commonly known as ‘rust’. Water & Oxygen gas must be present for Iron to rust. There many metals which react with oxygen, as a glance at the Standard Reduction Potential table will show. With the notable exceptions of silver & gold, most common metals will form spontaneous redox couples with oxygen.
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