Electrolysis protection

Know your anodes

Any craft moored in fresh or salt water is at risk from metallic corrosion. The effects can be costly, particularly as claims for corrosion and electrolysis, and the resulting damage is generally not covered by pleasure craft insurance policies.

Corrosion protection by installing sacrificial anodes is straightforward, and relatively inexpensive. MG Duff, the Chichester-based experts in marine cathodic protection, explains the main steps to minimise exposure to corrosion, which ultimately effects all vessels:

• Ensure compatible metal components are used, in build and replacement
• Use the correct paint type to offer added protection
• Ensure electrics are correctly installed and maintained, stray current is one of the main causes.
  

Protection from corrosion is possible by fitting sacrificial anodes, which waste away instead of the metal to which they are protecting. MG Duff advises that the number and size of anodes you need depends on the type of craft and the water where it is usually moored. If your anodes aren’t wearing at all it may not be a good sign.

When you buy a vessel, always check the anodes are the right type and size for the boat and the area where you intend to use it. Your survey report should provide this information. Finally, remember to check and replace your anodes regularly and contact your local boat yard or surveyor if you have any concerns.

Whilst the information is believed to be correct, Navigators & General takes no responsibility for any loss or damage however caused.