Tabman &/or others

[sugilbert]

I have to change out anodes yearly (occasionally 2) using Magnesium on my twin Merc OD's. I also have MerCathodes. Corrosion is apparently under control, however, the original 'pancake' anodes (11 years old) on my Bennett tabs are practically untouched.

I realize, if they are zinc, that they are totally ineffectual now. Need I change them out for Magnesium, leave them as is, or just remove them?

Searched BoatFix (19 pages) and only found rudder anodes in magnesium. They look like 2 'pancakes' back-to-back. Would that work, if needed?

 

[Tabman]

Steve,

In theory (and usually in practice too) if the boat is kept in fresh water there is no need to have zinc anodes on the Trim Tabs. You could install the round magnesium anodes om the Trim Tabs if you wanted things to be absolutely perfect. But if it were my boat in fresh water I would just leave things as they are.

Tom
Bennett Marine

 

[sugilbert]

Thanks Tom. Just a sanity check. Apparently, I have sufficient magnesium anodes and will leave the old zincs as is.