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Which of the following is/are the important characteristics of active-passive transitions of a metal?

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Which of the following is/are the important characteristics of active-passive transitions of a metal?

(a) Passive potential (Epp)

(b) Critical anodic current density (i­c)

(c) Passive potential (Epp) and Critical anodic current density (i­c)

(d) Neither passive potential nor critical anodic current density

This question was posed to me during an interview.

Question is from Modern Theory Principles in chapter Modern Theory Principles of Corrosion Engineering

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Right answer is (c) Passive potential (Epp) and Critical anodic current density (i­c)

The best I can explain: Passive potential is defined as the potential of a system at which the passivation of metal is starts whereas critical anodic current density is defined as the current density at which passivation of metals starts.

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