https://www.engineeringclicks.com/galvanic-series/
Good protection means being far enough apart on the series. The electrolyte matters too. Zinc isn't so great at protecting aluminum (i.e. outboards) so magnesium comes into use. Longevity, assuming that you have a reaction going on, comes down to mass of the sacrificial metal. Redundancy in case of physical loss is a tangential thought. I have a block of zinc bolted to my iron keel, which has been working for me in Lake Huron for >10 years. It's about the size of my cell phone. Jon Tebbens 78 Mega "Katherine" On Fri, 20 Mar 2020, 23:02 Marek Dziedzic via CnC-List < cnc-list@cnc-list.com> wrote: > From what I know, the aluminium is for brackish water and magnesium is for > fresh. > > > > > I’d like to get both max protection AND max life out of my anodes. For > those who sail in salty or brackish waters, which metal are you all using, > and what’s been the longevity? > >
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