Question

Which of the following is/are the class1 corrosion resistance materials in nitric acid?

(a) High-silicon cast irons

(b) Stainless steels (type 430)

(c) Titanium

(d) High-silicon cast iron, stainless steels, and titanium

I have been asked this question in an interview for internship.

I'm obligated to ask this question of Mineral Acids topic in division Mineral Acids of Corrosion Engineering

Answer 1

Right answer is (d) High-silicon cast iron, stainless steels, and titanium

The explanation is: Class1 materials are the materials that are used for a particular environment and it is generally recommended for a variety of conditions of temperature and concentration. Class1 materials for nitric acid includes high-silicon cast irons, stainless steels, and titanium.