Question

Which of the following is/are the environments that cause stress-corrosion cracking to titanium?

(a) Red fuming nitric acid

(b) Methanol-HCl

(c) Nitrogen tetroxide (N2O4)

(d) Red fuming nitric acid, methanol-HCl, and nitrogen tetroxide

I had been asked this question in unit test.

This intriguing question comes from Eight Forms topic in division Eight Forms of Corrosion of Corrosion Engineering

Answer 1

The correct choice is (d) Red fuming nitric acid, methanol-HCl, and nitrogen tetroxide

To explain I would say: Stress-corrosion cracking is the simultaneous action of stress and corrosive environment on a metal. Red fuming nitric acid, methanol-HCl, and nitrogen tetroxide are the environments that may cause stress-cracking corrosion.