Which of the following elements is primarily responsible for the corrosion resistance of
stainless steel?
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A.
Molybdenum
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B.
Nickel
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C.
Carbon
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D.
Chromium
Correct Answer:
D. Chromium
Explanation:
Stainless steel derives its ability to resist rust and corrosion from its chromium content, which must be at least 10.5%. When chromium reacts with oxygen in the atmosphere, it forms a thin, invisible, and self-healing oxide layer on the surface of the metal. This passive film acts as a protective barrier that prevents further oxidation of the underlying iron. While other elements like nickel and molybdenum are often added to enhance specific properties or resistance to certain environments, chromium is the essential element responsible for the alloy's fundamental corrosion resistance.
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