Principle of cathodic protection

2026-01-07View Original

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Before current-driven protection is applied, the natural corrosion potential of the corrosion galvanic cell is E, and the corresponding maximum corrosion current is IC. When an external current is applied, the amount of current flowing into the cathode from the electrolyte increases, and its potential decreases due to further polarization of the cathode. If the current flowing into the cathode is ID, its potential drops to E’, and at this point the current flowing out of the anode decreases from IC to I’. The difference between ID and I’ is the amount of current applied. When the cathode is polarized to reduce the total potential to the initial potential E0a of the anode, the metal component is fully protected.

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Principle of cathodic protection

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