Bonding & Cathodic Protection
BONDING SYSTEMS: “In the simplest of terms, bonding systems are an interconnection of underwater metallic components, including through hulls, struts, rudder stocks, and propeller shafts. Like any other critical component, bonding systems should be inspected regularly. When installing or augmenting bonding systems, connections should be made using heat shrink terminals, and conductant paste such as Thomas & Betts Kopr-Shield. Completed connections should be coated with corrosion inhibitor such as CRC Heavy Duty Corrosion Inhibitor.” https://www.proboat.com/2015/04/the-mysteries-of-bonding-systems-revealed/
CATHODIC PROTECTION: One type of cathodic protection system is the sacrificial anode. The anode is made from a metal alloy with a more "active" voltage (more negative electrochemical potential) than the metal of the structure it is protecting (the cathode). The difference in potential between the two metals means the sacrificial anode material corrodes in preference to the structure. This effectively stops the oxidation reactions on the metal of the structure being protected. https://galvanizeit.org/corrosion/corrosion-protection/sacrificial-anodes
SACRIFICIAL ANODES: Underwater anodes come in 3 materials:
- Zinc – Designed for saltwater environments.
- Aluminum – Designed for Saltwater or Brackish water environments.
- Magnesium – Designed for freshwater environments.
Depending on where the vessel will be kept determines the specific anode materials to be chosen. Proper anode monitoring & installation will greatly extend the service life of all your underwater metals. West Marine has a great video in the attached link. https://www.westmarine.com/WestAdvisor/Preventing-Galvanic-Corrosion
ANODE MONITORING: We monitor each component and its anode(s) specifically. Each component and its anode(s) are bonded together and are part of the vessels bonding system. With detailed monitoring we track each component down to the smallest detail - minor details can result in major savings down the road. By tracking the service history of each anode we are able to predict its future replacement, stocking its replacement specifically for your vessel. Accurate anode monitoring and proper anode installation are imperative to the service life of underwater metals.
ANODE INSTALLATION: Our goal is to keep your underwater anodes maintained and your underwater metals protected. Prior to installation, the diver will remove any surface residues left behind from the previous anode. Good bonding connections insure proper cathodic protection. Stainless steel fasteners all always used and all anodes are mad in the USA. We provide a wide variety of sacrificial anodes and replace them at 50% depleted; quotes upon request.
HANGING-ANODES: This can be a great solution for sailboats and vessels with inadequate anode protection. Hanging-anodes are designed to be an accessory to the underwater anodes. These anodes are manufactured with a long cable and a clamp, simply clamp the cable to the vessel-bonding-system and place anode overboard into the water. These anodes can be checked topside simply by lifting the anode out of the water by its cable and cleaning off surface residues. http://www.boatzincs.com/hanging_anode_zinc.html
GALVANIC ISOLATORS: A galvanic isolator is a device used to block low voltage DC currents coming on board your boat from the shore power ground wire. These currents could cause corrosion to your underwater metals; through hulls, propeller, shaft etc. By installing a galvanic isolator on your boat, your zinc anodes will protect your underwater metals from corrosion. Make sure the isolator you purchase has a fail-safe UL Marine rating. https://www.cruisingworld.com/how/one-cool-remedy-galvanic-isolators
Call us at (850) 696-2828 or fill out our Contact Us form to schedule a service.