Question

Which of the following metals can be protected using anodic protection?

(a) Nickel and iron

(b) Nickel, iron, and titanium

(c) Titanium only

(d) Nickel, iron, titanium, and magnesium

The question was posed to me during an interview for a job.

Question is taken from Cathodic and Anodic Protection topic in division Corrosion Prevention of Corrosion Engineering

Answer 1

Correct option is (b) Nickel, iron, and titanium

The best I can explain: Anodic protection can be used only for active-passive transition metals as it provides external current for the formation of a passive oxide layer. Active-passive transition metals include nickel, iron, aluminum, titanium, and its alloys.