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Air is only part of the story. Dissimilar metals in an electrolyte are what batteries are made of. Dissimilar metals in salt water are what outboard motors are made of. Batteries produce electricity. So do outboard motors in such an environment. The electricity is what carries atoms (or parts of atoms) from here to there. That produces a change in the composition of the metals. The anode is supposed to provide an alternate path for the electricity to flow. (Yeah, right). And this whole explanation is an over simplification of the process, trying to put it in layman’s terms. I’m not a chemical engineer, just a lowly outboard mechanic on Florida’s Gulf Coast, where outboards dissolve overnight. Well, it takes some of them a couple of years.