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Which of the following is/are the class2 corrosion-resistant materials in nitric acid?

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Which of the following is/are the class2 corrosion-resistant materials in nitric acid?

(a) Aluminum and Stainless steels

(b) Aluminum, Hastelloy, and Inconel

(c) Hastelloy and Inconel

(d) Hastelloy and Titanium

The question was posed to me in examination.

Query is from Mineral Acids topic in portion Mineral Acids of Corrosion Engineering

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The correct option is (b) Aluminum, Hastelloy, and Inconel

The best explanation: 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 Aluminum, Hastelloy, and Inconel.

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