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Which of the following is/are the class2 corrosion resistance materials in hydrochloric acid?

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Which of the following is/are the class2 corrosion resistance materials in hydrochloric acid?

(a) Bronzes and Cupronickels

(b) Hastelloy D and Duriron

(c) Bronzes, Stainless steels, Bronzes, Cupronickels, Hastelloy D and Duriron

(d) Stainless steels and Duriron

I got this question in an internship interview.

My doubt stems from Mineral Acids topic in section Mineral Acids of Corrosion Engineering

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The correct choice is (c) Bronzes, Stainless steels, Bronzes, Cupronickels, Hastelloy D and Duriron

To explain: Class2 corrosive resistance materials of nitric acid are the materials that are used in only certain specific conditions of temperature and concentration because of limited corrosion resistance and cost. This includes bronzes, stainless steels, bronzes, cupronickels, Hastelloy D, and Duriron.

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