Question

Which of the following is/are correct regarding the active region of metals?

(a) Corrosion rates increase exponentially

(b) Corrosion rates increase linearly

(c) It follows typical Tafel behavior

(d) It follows typical Tafel behavior and corrosion rates increases exponentially

I had been asked this question in a national level competition.

This interesting question is from Modern Theory Principles in portion Modern Theory Principles of Corrosion Engineering

Answer 1

Right answer is (d) It follows typical Tafel behavior and corrosion rates increases exponentially

To explain I would say: Active region is the first stage of active-passive transition in which the corrosion rates increase exponentially and it follows typical Tafel behavior.