Martyr Anodes – FAQ

A sacrificial anode is a metal designed to corrode instead of your boat’s essential parts. It protects metal components like hulls, propellers, shafts, and rudders from corrosion by attracting electrochemical reactions that would otherwise damage your boat.

The right anode depends on the type of water you operate in:

• Saltwater → Zinc or Aluminum
• Brackish Water → Aluminum
• Fresh Water → Magnesium
  Using the wrong anode can reduce protection or cause premature wear.

Anodes should be replaced when they are 50% worn down or at least once a year, depending on water conditions and usage. Regular inspections will help ensure they remain effective.

Rapid anode depletion can be caused by:

• Stray electrical currents from onboard wiring
• Harsh environmental conditions (such as highly active saltwater)
• Undersized anodes for the amount of metal they need to protect
  A marine electrician can help diagnose excessive wear issues.

No, mixing different anode materials (e.g., zinc and aluminum) can create unwanted galvanic reactions, reducing protection and causing uneven wear. Stick to one material based on your water type.

Without anodes, your boat’s metal parts will corrode faster, leading to expensive repairs, structural damage, and potential equipment failure while on the water.

Martyr Premium Aluminum and Freshwater Magnesium anodes are made without added cadmium, offering a cleaner, environmentally responsible alternative without sacrificing performance.

Inspect anodes regularly for wear and chalky buildup. A healthy anode should gradually corrode over time—if it looks untouched or deteriorates too fast, it may not be working correctly.

Common installation points include:

• Hull (especially near high-risk areas)
• Propeller shaft & rudder
• Trim tabs and outdrives
  Proper placement ensures even protection for all metal components.