Tecnoseal Volvo Penta Engine Zinc Anode Kit DuoProp 280

The function and operation of the zinc anode

A zinc anode protects the iron and other metal parts of a boat from corrosion . The anode is installed below the waterline on the objects that need to be protected, such as drive gears, propeller shafts and other metal structures.

Corrosion occurs electrochemically . When different metals are in contact with each other and the environment is water, they form a kind of electric battery:

• metals act as battery terminals

• salt water (or fresh water) acts as an electrolyte

In such a combination , the baser metal always corrodes first . Zinc is a more base metal than iron, stainless steel, copper or brass, so it sacrifices itself and protects the other metal parts.

Installation and maintenance

• Zinc anodes should be checked every time the boat is lifted.

• A worn anode must be replaced immediately.

• The zinc anode is installed longitudinally in connection with the metal parts to be protected.

• The zinc anode must not be painted , not even with boat primer, as painting will prevent its function.