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Slow oxidation of some metals (aluminum, etc.) ) can form a dense oxide film at room temperature, prevent further oxidation inside the metal, and indirectly play an anti-corrosion role. For example, al (aluminum) is actually more active and oxidized than iron, but usually we seldom notice its rust, which is why. Fe can also form a dense fe3o4 film at high temperature, and it can also play an anti-corrosion role. For another example, connecting easily oxidizable metals with refractory metals can slow down the corrosion of refractory metals (sacrificial anode protection).
shortcomings
Scrap metal, reduce strength, etc. It must be from a general textbook.
Edited on 20 19-06- 16.
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What good will it do if iron rusts?
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