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Which of the following phenomenon that results in the dissolution of iron by leaving porous graphite on the surface of grey cast iron?

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Which of the following phenomenon that results in the dissolution of iron by leaving porous graphite on the surface of grey cast iron?

(a) Dezincification

(b) Decalcification

(c) Graphitization

(d) Dezincification and graphitization

This question was posed to me in homework.

My enquiry is from Eight Forms topic in portion Eight Forms of Corrosion of Corrosion Engineering

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Right answer is (c) Graphitization

The explanation: Graphite is cathodic to iron in grey cast iron that results in the dissolution of iron by leaving porous graphite in a mild corrosive solution. This phenomenon is known as graphitization.

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