Anodic Protection
Corrosion is one of the most common and misunderstood problems in boating. Every boat with metal below the waterline will experience it over time. The key is managing it before it causes damage.
Galvanic Corrosion (Most Common)
Occurs when different metals are connected and submerged in water. One metal will slowly sacrifice itself to protect the other. This is normal—but must be controlled.
Stray Current Corrosion (Serious and Fast)
Caused by electrical faults, usually from onboard systems. This type can destroy metal components very quickly and requires immediate attention.
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How Boats Are Protected
Protection systems are designed to slow or prevent corrosion:
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Sacrificial zinc anodes → absorb corrosion instead of your metal parts
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Bonding systems → connect underwater metals for controlled protection
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Paint coatings → isolate metal from water exposure
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Galvanic isolators / transformers → reduce electrical-related corrosion
Each system must function correctly to be effective.
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What You Should Know
Marina docks can accelerate anode burning, but..
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Corrosion is usually caused by your boat—not the marina
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Sacrificial anodes must have proper electrical contact to work
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Not all corrosion can be prevented—only managed
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Rapid or unusual damage is a warning sign that needs immediate inspection
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Where We Help
During cleaning, we visually inspect underwater components and look for:
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Worn or depleted zincs/anodes
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Early signs of metal loss
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Damage or abnormal corrosion
If something looks wrong, you are notified so it can be addressed before it becomes a major issue.
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Bottom Line
Corrosion is predictable and manageable when monitored regularly.
Ignored, it becomes expensive—and sometimes dangerous.
Routine inspection and proper protection keep your boat safe and operating as intended.