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Which of the following is/are the class3 corrosion-resistant materials in nitric acid?

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in Corrosion Engineering by (98.5k points)
Which of the following is/are the class3 corrosion-resistant materials in nitric acid?

(a) Copper and its alloys

(b) Nickel and its alloys

(c) Low-alloy steels

(d) Low-alloy steels, copper, nickels and their alloys

I got this question in final exam.

The doubt is from Mineral Acids in portion Mineral Acids of Corrosion Engineering

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Right option is (d) Low-alloy steels, copper, nickels and their alloys

For explanation I would say: Class3 materials are recommended for use in a particular environment because of its less corrosion resistance. This includes copper and its alloys, nickel and its alloys and low-alloy steels.

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