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What is the trans passive region?

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What is the trans passive region?

(a) Region after passive state

(b) Formed by breakage of the protective film in the passive region

(c) Constant corrosion rate

(d) Region formed after passive state by breakage of the passive oxide layer

This question was posed to me in final exam.

This question is from Corrosion Principles in portion Corrosion Principles of Corrosion Engineering

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Right choice is (d) Region formed after passive state by breakage of the passive oxide layer

The best explanation: Trans passive region is formed in an active-passive transition metal after crossing the limiting oxidizing potential after a passive region. This occurs due to the breakage of the protective layer due to the unbearable oxidizing potential of the corrosive medium.

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