806189 Zinc or Magmesium Trim cylinder Mercruiser Alpha series
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The 806189 anode can be made from either zinc or magnesium. Zinc is the more common material for anodes, as it is more effective at protecting underwater metal parts from corrosion. However, magnesium is a more active metal, which means that it will corrode more quickly. This can be a good thing in freshwater, as magnesium anodes will provide more effective corrosion protection. However, in saltwater, magnesium anodes will corrode too quickly and will need to be replaced more often.
The original 806189 anode was made of zinc. However, there is also a magnesium version of the anode available, which is 806189MG. The magnesium version of the anode is more effective in freshwater, but it will need to be replaced more often than the zinc version.
The best material for an anode will depend on the type of water in which your boat is operated. If you boat in saltwater, a zinc anode is the best option. If you boat in freshwater, a magnesium anode may be a better choice.
Here is a table that summarizes the pros and cons of zinc and magnesium anodes:
| Material | Pros | Cons |
|---|---|---|
| Zinc | More effective at protecting underwater metal parts from corrosion | Less active, so it will corrode more slowly |
| Magnesium | More active, so it will corrode more quickly | More effective in freshwater |
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