Why do need a zinc anode for your boat?

A zinc anode can be considered to be a sort of sacrificial anode employed for preventing corrosion using cathodic protection. We also classify it as a galvanic anode while the other types of galvanic anodes are being prepared from magnesium and aluminum. The protective properties of zinc anodes are due to a powerful negative reduction potential that happens to be more negative as compared to the metal protected by it.
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zinc anode
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zinc anode

Zinc anode can considered to be a sort of sacrificial anode employed for preventing corrosion using cathodic protection as a galvanic anode