Mercury - Zinc Trim Tab Anode Plate Corrosion Protection Marine Zinc 98432T6. Overview. Every boater has that moment when they ease back on the throttle, drift for a second, and feel grateful that their engine is protected from whatever the water throws at it. That's exactly the kind of confidence the Mercury 98432T6 Zinc Trim Tab Anode Plate delivers. It's a small but mighty line of defense, quietly working beneath the surface to keep galvanic corrosion from eating away at your outboard. When y