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I'm no expert, but from a chemistry point of view, zinc is even further from brass or bronze than aluminum is. More dissimilar = more likely to degrade easily? More sacrificial and hence more protective? Many of the sites offering aluminum anodes say they last longer than zinc - is that a good thing? Don't you *want* them able to degrade easily?

Maybe this article will shed some light?

One advice that has been consistent - all your sacrificials should be made of the same material (otherwise they sacrifice for each other, rather than your prop/shaft!!!)

Hope this helps at least a bit.
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