aluminum boat anodes
The advantages of aluminum anodes. there are a few reasons why many manufacturers and boaters use aluminum over zinc or magnesium anodes. in recent years, aluminum has dropped in price, making it a more attractive choice for manufacturers when installing sacrificial anodes onto their new vessels, engines, strainers, heat exchangers, etc.. Where anode depletion occurs more rapidly than one per season the action can be extended by hanging anodes over the side of the boat, again placing them as close to the cathode as possible. in the case of a saildrive the connection should be made to the leg itself, using insulated wire to avoid bridging the isolation.. Anodes, zincs, magnesium, aluminum and galvanic corrosion on boats. among the dozens of different types of corrosion, the two types of general concern to boaters are stray current corrosion and galvanic corrosion. for this excercise we are going to stick to galvanic corrosion which is a simple process made more complicated by the widespread. 
aluminum boat anodes Aluminum for brackish water: more active than zinc, aluminum anodes are a good compromise where fresh and salt water mix, such as the brackish water of river deltas, or if you use your boat in a variety of water types. zinc is too passive for brackish water, where it gets covered in a zinc oxide film and becomes inactive.. If you mix aluminum and zinc anodes on an aluminum boat the aluminum anodes will attempt to handle the entire galvanic load of protecting the boat, the zinc anodes will happily sit on the couch drinking all the beer. internal and external factory outboard anodes are aluminum. every alloy boat i get in the shop equipped with factory aluminum.
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