All Products Conform to

US-MIL-SPEC A-18001-K Zinc Alloy

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We use precision casting when manufacturing our anodes. We also use the best material: US-MIL-SPEC A-18001-K zinc alloy. We understand the importance of using only the best products, and how to keep them in good condition. The contact between the anode and the metal it protects is vitally important. For this reason, never paint an anode, the metal it’s protecting, or any surrounding areas.

ElectroGuard fasteners are made with matching stainless steel screws, bolts, nuts and washers. All screw holes and tapped parts are made to fit perfectly onto outdrives. The nuts in our shaft collars are staked into the anode for easier underwater installation, and every part is inspected at least three times during the manufacturing process to ensure consistent quality.  All ElectroGuard products comply to US-MIL-SPEC A-18001-K zinc alloy.

Millions of boat owners worldwide revel in the joy of owning such a prized possession. Whether you are sailing the seas, taking a cruise or you are a commercial fisherman, boat owners enjoy a unique experience many will never know. They also understand that how they take care of their boats is just as important as the boat itself – that’s why they choose ElectroGuard.

At ElectroGuard, our expertise in pressure die casting produces the most solid protection against galvanic corrosion -- a process that happens when two types of metals come together and are exposed to a certain type of liquid, such as salt water. A highly anodic metal (a positively charged electrode) such as zinc will corrode much more quickly than a highly cathodic metal (a negatively charged electrode), such as stainless steel, when the two are in contact with each other. The zinc anode has been constructed to serve as a “buffer” between the metals, to sacrifice itself in order to protect the more valuable metals on your boat, such as the propeller, drive shaft and outdrive.


The Relationship of Metals


Galvanic corrosion has the potential to attack combinations of metal that are not compatible. The first rule of thumb is always: “don’t mix metals.”  The rate of corrosion depends upon the differences in electrical potential, or the anodic-cathodic relationship of the metals. To reduce the likelihood of galvanic corrosion, it is recommended that metals are grouped as closely together as possible, as per the Galvanic Series chart. (see below).

Electroguard Boat Anode Zincs

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Galvanic Corrosion

Galvanic corrosion is a localized corrosion process whereby metals can be preferentially corroded. This type of corrosion is rapidly accelerated when stray current is introduced. This stray current may come from many sources, including shore power at your dock or faulty wiring on your boat or even your neighbor’s boat.

When these metals are placed in a conductive liquid such as salt water, current will flow. This is also sometimes referred to as electrolysis. With the ElectroGuard anode in place, however, the current will remove the metal from the zinc anode, instead of the anodic metal on your boat. This sacrifice on behalf of the zinc anode gives your boat unsurpassed protection. Our sacrificial zinc anodes are highly effective in protecting the boat’s metal.

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GALVANIC SERIES OF METALS AND ALLOYS


Any one of the below metals and alloys will theoretically corrode while protecting any other that is lower in the series as long as both form part of an electrical circuit:

  1. CORRODED END - ANODIC (Electronegative)
  2. MAGNESIUM
  3. ZINC
  4. ALUMINUM
  5. CADMIUM
  6. IRON or STEEL
  7. STAINLESS STEELS (active)
  8. LEAD
  9. TIN
  10. COPPER
  11. GOLD
  12. PROTECTED END - CATHODIC (Electropositive)


For those who are unable to follow the rules in the Galvanic Series chart, it is recommended that a barrier be put between the two metals. An example of a barrier is a non-metallic washer, gasket or a jointing compound.

IMPORTANT: Never paint a sacrificial anode or the area where the anode comes in contact with other metals.