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Which of the following alloying elements are not recommended in the sulfuric acid environment?

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Which of the following alloying elements are not recommended in the sulfuric acid environment?

(a) Chromium

(b) Nickel

(c) Molybdenum

(d) Nickel and molybdenum

The question was posed to me in examination.

This interesting question is from Mineral Acids topic in division Mineral Acids of Corrosion Engineering

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Right answer is (c) Molybdenum

The explanation: Alloying elements are added in base metal to exhibit certain specific properties such as corrosion resistance, thermal properties, or mechanical properties. Here molybdenum is not recommended as an alloying element in high-silicon cast iron for sulfuric acid application.

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