ANODO HELICE TWIN DISC-BCS Ø50 (ZN)

Function and technical context

This zinc propeller anode for Twin Disc-BCS transmissions with Ø50 reference diameter acts as sacrificial cathodic protection, absorbing galvanic corrosion that would otherwise attack the metal components of the propeller and propulsion shaft. It works within the boat's propulsion system, positioned directly on the hub or coupling area of ​​the propeller to interpose itself between the base metal and the electrolytic medium of sea or brackish water. Without active cathodic protection in good condition, galvanic corrosion progressively degrades the propeller hub, the shaft and the bronze or stainless steel components of the transmission, potentially causing loss of propulsive efficiency, mechanical looseness and, in advanced cases, structural failures in the shaft line. The zinc composition makes it especially suitable for salty and brackish waters, where the electrochemical potential of the environment is more aggressive.

When to replace this part?

Zinc anodes should be visually inspected at least once a season and replaced when they have lost approximately 50% of their mass, have a completely blackened and hardened surface, or show cracks indicating depletion of the sacrificial material. For boats that remain in the water continuously or navigate in waters with high conductivity, it is recommended to check the condition of the anode every 6 months or at the beginning and end of each nautical season. Preventatively replacing the anode before it is completely consumed is the most economical measure to avoid costly repairs to the propeller, shaft or transmission bushings.

Compatibility table