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The phenomenon where the density of metal is exceptionally low due to increasing potential is known as _______

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The phenomenon where the density of metal is exceptionally low due to increasing potential is known as _______

(a) Polarization

(b) Ionization

(c) Passivation

(d) Canonization

This question was posed to me in an internship interview.

My question is from Types of Corrosion and Oxidation topic in division Imperfection in Metal Crystals, Fracture, Corrosion and Oxidation of Engineering Material & Metallurgy

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Correct answer is (c) Passivation

The explanation: When the potential of metal increases, its current density increases. However, after the critical value, it is lowered suddenly and remains constant for a while. This is known as passivation.

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