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Which of the following characteristics of active-passive metal will acquire optimize crevice corrosion resistance?(a) A narrow active-passive transition(b) A small critical current density(c) An extended passive region(d) A narrow active-passive transition, a small critical current density, and an extended passive regionI got this question during an interview.Query is from Eight Forms topic in portion Eight Forms of Corrosion of Corrosion Engineering

Answer»

Correct choice is (d) A narrow active-PASSIVE TRANSITION, a small critical current density, and an extended passive REGION

The explanation: The optimum crevice corrosion resistance of active-passive transition metal is acquired by having the following CHARACTERISTICS: i. A narrow active-passive transition

ii. A small critical current density

iii. An extended passive region



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