Question

Which of the following metal(s) produces metal oxide at a metal-scale interface?

(a) Titanium

(b) Niobium

(c) Zirconium

(d) Titanium, Niobium, and Zirconium

I had been asked this question at a job interview.

My question is taken from High-Temperature Corrosion topic in section High Temperature Corrosion of Corrosion Engineering

Answer 1

The correct choice is (d) Titanium, Niobium, and Zirconium

To elaborate: Titanium, Niobium, Zirconium, Hafnium, and Tantalum are the metals that produce metal oxides at the metal-scale interface. It is due to the predominant diffusion of oxygen-ion rather than metallic cation.