The GATE Grind

GATE 2026 MT – Question 31

Physical Metallurgy · Corrosion · 1 mark · Multiple select

Which of the following elements, when present in iron, enhance(s) its corrosion resistance?

  1. H
  2. Cr
  3. S
  4. C

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Correct answer: (B) Cr

Explanation

Chromium forms a thin, adherent, self-repairing chromium-rich oxide film, reducing continued attack of the underlying iron alloy. Hydrogen and sulfur tend to cause damage, while carbon can impair stainless corrosion resistance through chromium-carbide precipitation. Therefore the listed beneficial element is **Cr, B**.