ANODE MAX PROP 81mm.

Function and technical context

Sacrificial anodes are essential elements in the galvanic protection of ship propellers and shafts. This anode for 81 mm Max Prop propeller acts as a sacrificial electrode in the propulsion system, attracting electrochemical corrosion to itself and thus protecting the noblest metallic components of the variable pitch propeller. Being made of zinc, it offers a more negative electrochemical potential than the bronze or stainless steel of which the propeller components are composed, so it preferentially corrodes before the structural parts do so. Without effective cathodic protection, the hub, blades and shaft suffer accelerated corrosion that can seriously compromise the integrity of the propulsion system, with the consequent risk of breakdowns during navigation.

When to replace this part?

The clearest indicator that the anode needs to be replaced is the reduction in its mass: when it has lost approximately half of its volume, it has reached the limit of its useful life and no longer offers sufficient protection. As a general rule, propeller anodes should be inspected at least at the beginning and end of each sailing season, and replaced whenever wear exceeds 50% or when pitting or discoloration is detected in the adjacent metals of the Max Prop propeller. Replacing the anode preventatively at the beginning of each season is best practice: the minimal cost of this component is unmatched by a propeller or shaft repair at the dock.

Compatibility table