Is Galvanic Corrosion Eating You?

Galvanic corrosion is a type of corrosion that occurs when two different metals are connected in an electrolyte, such as saltwater. When the two metals are connected, an electrical current flows between them, causing one of the metals to corrode faster than it would otherwise.

On a boat, galvanic corrosion can occur when different metal components of the boat's electrical system or hull are connected, such as a steel propeller and an aluminum hull. The corrosion can cause serious damage to the boat over time, and it can be difficult and expensive to repair.

To prevent galvanic corrosion on a boat, it is important to use galvanic isolators or sacrificial anodes. Galvanic isolators are devices that are installed in the electrical system to prevent the flow of electrical current between different metal components. Sacrificial anodes are metal rods that are installed on the hull of the boat and connected to the electrical system. They are designed to corrode instead of the more valuable metal components of the boat, protecting them from corrosion.

It is also important to regularly inspect and maintain the boat's electrical system and hull to identify and address any potential sources of galvanic corrosion. If you are unsure of how to prevent or repair galvanic corrosion on your boat, it is a good idea to consult with a marine electrician or a boat manufacturer for guidance.