Guide to galvanic corrosion

Leisure boats often use a mix of metals such as aluminium hulls, stainless steel fittings and bronze propellers. Galvanic corrosion occurs when two dissimilar metals are electrically connected in the presence of an electrolyte (a conductive liquid such as seawater or freshwater). It results in irreversible damage to your boat’s underwater components - propellers, shafts, through-hull fittings etc. This guide explains how your boat could be impacted (even if moored in an inland marina) and the steps to take to mitigate damage.

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