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Q: I am getting a build up of a white deposit on my vessel or anode. What is it?

A white build-up on the surface of the anode may indicate that the anode has passivated and has stopped working. This may be because the wrong anode material has been selected (most commonly this occurs when zinc or aluminum anodes are wrongly used in fresh water). A chalky white build-up on a boat’s propeller is a sign of strong cathodic protection in action. This will not harm your stern gear and can be removed with a wire brush when the vessel is out of the water.

Tags: white build up, white deposit, passivated anode

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