Function & principle of Yamaha sacrificial anodes
Sacrificial anodes provide cathodic corrosion protection in the maritime environment. They are made of a less noble metal than the Yamaha drive components to be protected and corrode preferentially. This effectively protects outboard housings, shafts, propeller areas and underwater parts from electrochemical material erosion.
Materials: Magnesium, Aluminum & Zinc
Yamaha sacrificial anodes are available in different materials depending on the application:
Magnesium
-
Highest electrochemical potential
-
Optimal for fresh water
-
Ideal for inland waterways, lakes and rivers
Aluminum
-
Very good all-round properties
-
Suitable for brackish and salt water
-
Durable and lightweight
Zinc
-
Classic material for salt water
-
Proven with high conductivity
The right choice of material is crucial for maximum protection.
Fresh water, brackish water or salt water - the right choice of material
-
Fresh water: Magnesium is optimal
-
Brackish water: aluminum preferred
-
Salt water: aluminum or zinc
Magnesium offers the most effective protection for Yamaha outboards in fresh water due to its higher electrochemical potential.
Areas of application for Yamaha outboards
Yamaha sacrificial anodes are mounted on:
-
Underwater housings
-
Propeller and shaft areas
-
Trim and mounting points
-
Other metal components in contact with water
Targeted placement ensures that sensitive alloys are protected from corrosion.
Selection by reference number & model
The following are decisive for a precise selection:
-
Yamaha model & series
-
Engine power
-
Year of manufacture
-
Original reference number of the anode
Matching using the reference number minimizes incorrect orders and ensures an optimum fit.
Installation & replacement instructions
-
Clean contact surfaces before fitting
-
Do not paint or coat anodes
-
Use corrosion-resistant screws
-
Replace when approx. 50 % of the material has been removed
Regular inspection before and during the season ensures lasting protection.
Maintenance & typical signs of corrosion
Signs of insufficient protection can be
-
Pitting or crevice corrosion on the housing
-
Material erosion on shafts or fastenings
-
Irregular anode wear
-
Traces of oxidation on underwater parts
Regular visual inspection prevents cost-intensive consequential damage.
