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Which of the following alloying elements increase resistance of steel to atmospheric corrosion?

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Which of the following alloying elements increase resistance of steel to atmospheric corrosion?

(a) Copper

(b) Nickel

(c) Chromium

(d) Copper, nickel and chromium

The question was posed to me at a job interview.

My query is from Environments topic in section Other Environments of Corrosion Engineering

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The correct choice is (d) Copper, nickel and chromium

The explanation: Steel is the most widely used metal for various metallic structures in all atmospheres. The resistance of steel can be improved by alloying elements such as copper, nickel and chromium. This is due to formation of stable, thick and adherent protective film.

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