Corrosion behavior of spheroidal graphite cast iron with different carbon contents has been studied. Immersion tests and electrochemical measurements were performed in sulfuric acid solutions of pH from 1.0 to 3.0. The corrosion current density of the cast iron is not a function of the content of carbon and the area of graphite particles at the surface. The corrosion current density of the cast iron is higher than the reported values of pure iron. This results from the promotion of both the anodic and cathodic reactions. The dependences of the corrosion potential and the corrosion current density on pH are the same as those of pure iron.

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