Re: Anodes

[billw]

Magnesium is definitely fresh water only. In salt water, the choices are only zinc or the aluminum alloy. I’m changing zincs all the time. It is my observation that the aluminum alloy does a better job of protecting what it’s supposed to protect; although they do deteriorate faster. Aluminum alloy (Mercury used to call it "Indium Aluminum, " if I recall right) is standard not only on ‘Crusier, but also on Mercury and Yamaha outboards. Do NOT use zinc in fresh water, as it will over protect and can bubble the paint. Zinc anodes will cause more corrosion in fresh water than if no anode was used at all.

Long live American manufacturing!