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You may hear them called zincs, but the sacrificial anodes on your Mercury aren't necessarily made from zinc. Mercury and Quicksilver offer anodes made from different alloys, including aluminum and magnesium, and the right material depends partly on where the boat operates. Choosing the correct anode matters because these small pieces of metal are designed to corrode so more expensive parts of your outboard or sterndrive don't.  What Does a Sacrificial Anode Do? When dissimilar metals are …