What is the purpose of an anode on an outboard motor?

The purpose of an anode on an outboard motor is to protect against corrosion. In marine environments, metal components are susceptible to electrolysis and corrosion due to the presence of water and various electrolytic processes. Anodes, typically made of zinc, aluminum, or magnesium, are designed to corrode preferentially, meaning they will sacrifice themselves to protect the more critical metal parts of the motor, such as the propeller and the lower unit.

When an anode is properly attached to the outboard motor, it absorbs the corrosive properties of the water, thereby preserving the integrity of the motor's materials. This protective mechanism is essential for enhancing the longevity and performance of marine equipment. It is a critical component ensuring that the engine remains operational and free from damage due to corrosive elements in the aquatic environment.

The other options do not capture the essential function of anodes. Covering the propeller does not relate to corrosion protection, providing attachment points is a structural function rather than a protective one, and reducing fuel consumption is unrelated to the role of anodes in preventing corrosion.