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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?

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

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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