Sierra 18-6046 Zinc Marine Rudder Anode Sacrificial Corrosion Protection

The Sierra 18-6046 is a zinc sacrificial rudder anode engineered to protect your vessel's submerged metal components from the damaging effects of galvanic corrosion. Designed for inboard and sterndrive applications, this anode mounts directly to the rudder, where it acts as the preferred metal in the galvanic series, corroding in place to safeguard more critical and expensive underwater components.

Galvanic corrosion occurs when dissimilar metals are electrically connected and submerged in a conductive solution such as saltwater. By introducing a highly active zinc anode into the system, electrochemical activity is directed away from shafts, propellers, and rudder hardware, concentrating wear on the replaceable anode instead. Zinc anodes are specifically formulated for saltwater environments.

Key Specifications:

• Material: Zinc alloy
• Diameter: 2-13/16 inches (71 mm)
• Application: Rudder anode for inboard/sterndrive marine use
• Recommended Environment: Saltwater
• UPC: 309995641770

Key Features:

• Sacrificial zinc construction preferentially corrodes to protect surrounding metalwork
• Ideal for saltwater boating environments
• Direct-mount rudder design for straightforward installation and replacement
• Manufactured by Sierra International, a leading aftermarket marine parts supplier

For best results, inspect your anodes regularly and replace when approximately 50% of the material has been consumed. Allowing anodes to fully deplete leaves your underwater hardware unprotected.