Anodes (Sacrificial Zinc/Aluminium)

When two different metals are submerged in water, a natural electrical current forms that degrades the weaker metal—a process known as galvanic corrosion. Genuine Yamaha sacrificial anodes are engineered to act as a defensive shield for your outboard, intentionally degrading over time to preserve the aluminum alloy of your lower unit, bracket, and powerhead blocks. Neglecting to replace these components leaves your propeller shaft, trim brackets, and cooling passages vulnerable to rapid pitting and structural failure.

Available in specialized compositions tailored to different marine environments, these factory-engineered components are cast to match the exact physical contours and grounding points of your specific motor series. Yamaha’s alloy blends dissolve uniformly to maximize structural defense without creating scale buildup. Each complete kit features essential external configurations—including the lower skeg trim tab, the main transom bracket bar, and internal block button elements—along with fresh stainless steel mounting bolts to guarantee a low-resistance electrical connection.

Crucial Maintenance Note: As clearly stamped on factory parts like the transom bar anode shown above, you must NEVER PAINT sacrificial anodes. Applying paint or anti-fouling coatings insulates the metal, completely blocking the electrical connection required to safeguard your engine.

Materials & Environment Mapping:

• Aluminum Alloys: The factory baseline standard. Highly versatile, long-lasting composition optimized for brackish water and salt water environments.

• Zinc Alloys: Traditional heavy-metal composition designed strictly for dedicated saltwater operation.

• Magnesium Alloys: Highly reactive compound built exclusively for pure freshwater applications (never to be used in saltwater, as they dissolve too rapidly).

Key Components Available:

• Trim Tab Anodes (positioned directly above the propeller to counter steering torque and protect the gearcase)

• Transom Bracket Bar Anodes (mounted below the tilt mechanism to shield large structural hinges)

• Internal Powerhead Cylinder Button Anodes (protects internal cooling water jackets from scale pitting)

• Lower Skeg Trim Blocks and Button Arrays

Ideal For: Seasonal hull inspections, annual 100-hour system overhauls, correcting visible metal pitting, and converting an outboard for use in different water environments.