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Efficiency of Cathodic Protection-Sacrificial Anode: The
efficiency of cathodic protection-sacrificial anode depends on the alloy composition of the sacrificial anode and the environment in which it is applied.
In the case of sacrificial anodes, the discharge current is due to the cathodic protection current provided by the anode to the protected structure, and partly due to the localized self-corroding cell on its surface.
The consumption of an anode is directly proportional to the current released from its surface.
The efficiency of a sacrificial anode is the ratio of the metal consumed for the cathodic protection current to the total metal consumed. Magnesium anode efficiency is generally less than 50%, while zinc anodes can reach 90% efficiency and aluminum anodes can reach 85% efficiency.
The above three types of sacrificial anodes are widely used in cathodic protection systems.
