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Which of these metals does not require alloying for oxidation resistance?

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Which of these metals does not require alloying for oxidation resistance?

(a) Iron

(b) Copper

(c) Aluminum

(d) Molybdenum

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This interesting question is from Corrosion and Oxidation Control in section Imperfection in Metal Crystals, Fracture, Corrosion and Oxidation of Engineering Material & Metallurgy

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Right option is (c) Aluminum

Explanation: Molybdenum is generally covered with a protective oxide coating while titanium acts as one. As a result, no alloying elements are used to improve their oxidation properties, unlike elements like copper and molybdenum.

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