What is the difference between red hot iron and iron covered with red rust? If you scrape off the flaky rust from the surface, we get back the iron. Can we now call it a physical change? Why/Why not?
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Explanation:
Austenitic stainless steels such as 304 or 316 have high amounts of nickel and chromium. The chromium combines with the oxygen before the iron is able to which forms a chromium oxide layer. This layer is very corrosion resistant which prevents rust formation and protects the underlying metal.
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