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The basic process of electrochemical corrosion

2026-01-21View Original

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The electrochemical corrosion process of metals is essentially the working process of the aforementioned galvanic cell. If the copper plate in the aforementioned copper-zinc galvanic cell is not connected to the zinc plate by a wire, but rather is dispersed within the zinc plate as impurities, then when the zinc plate is immersed in dilute sulfuric acid, many tiny copper-zinc galvanic cells are formed. Zinc with a lower potential will also dissolve (be corroded); the electrons from zinc flow directly to the impurity copper, where they combine with hydrogen ions in the solution to form hydrogen gas that is released. As shown in the figure below.

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