Corrosion protection options for outboards are strictly anodes only, while stern drives typically use a combination of anodes and an impressed-current cathodic protection system (e.g., Mercathode for Mercury, equivalent systems for Volvo); impressed-current systems use battery power to actively protect the metal in addition to passive anode protection.
factualpending
Speaker
Mike BonakerEvidence Quote
“as far as outboards it's it's pretty much strictly anodes uh for stern drives uh it's usually a combination of anodes in some sort of impressed current system which is the mercato system and mercury”
Source
ABYC Online Education "Huddle": Discussion and Review of Popular Technical Topics with Mike Bonicker— American Boat & Yacht Council - ABYCCreated: 8/13/2026, 9:52:05 AM
My Notes
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