Anodes & Zincs

Anodes & zincs for hull, shaft, prop & rudder & engine.

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231 products

Sea Shield Marine, Streamline Collar Shaft Anodes, Zinc SKU: 541938-3/4"

From $9.57

Zinc Engine Anodes With Plugs SKU: 531471-2in-1/4"

From $3.75

Sea Shield Marine Rudder and Trim Tab Anodes, Zinc SKU: 542307-Small

From $12.15

Sea Shield Marine Max Prop Anodes SKU: 542306-2-2/3" x 2-2/3" x 2"

From $14.80

Sea Shield Propeller Nut Replacement Anodes Zinc SKU: 542303-ZincB

From $7.54

Rudder Anodes, Aluminum SKU: 536474-1-7/8"

From $5.99

LIMITED CLEARANCE SHAFTS SKU: 536448-1-3/8"

From $19.37

Sea Shield Streamline Collar Shaft Anode SKU: 565920-1-1/2"

From $14.52

Martyr Propeller Nut Anodes
SKU: 562573-1-1/4"-3/4"

From $17.50

Martyr Limited Clearance Shaft Anodes Imperial SKU: 562554-2-3/4"-ALUMN

From $34.50

Martyr Volvo Penta Ring Zinc SKU: 562532-Small

$7.75

Martyr Hull Anodes CMZ22 1 1/2" x 6 1/2" x 14 SKU: 562531-ZNC

$130.95

Streamlined Shaft Anodes, aluminum, Metric SKU: 562526-30mm

$14.49

Martyr Prop Nut Shaft Spare SKU: 562520-1-1/2"

From $47.50

Martyr Volvo Outdrive Anode SKU: 549262-6"

From $18.49

Martyr Weld-On Teardrop Anodes w/Straps SKU: 549236-Aluminum

From $21.94

Martyr Hull Anodes SKU: 549235-Aluminum

From $10.81

Martyr Anode Kits Bravo 1 and Bravo 3 SKU: 549234-Bravo I

From $54.30

Martyr Plate Stock SKU: 549233-1/2" x 3" x 6"-Aluminum

From $10.75

Martyr Shaft Anodes SKU: 549231-2.62"-Zinc

From $17.83

Martyr Replacement Anodes SKU: 549230-1/4"

From $3.34

Martyr Rudder Anode SKU: 549229-1.5"

$56.21

Martyr Zinc Replacement Prop Nut Fasteners SKU: 549228-2.05"

From $11.85

Martyr Aluminum and Zinc Hull Anodes SKU: 549227-1" x 2-1/2" x 5"-Steel Strap

From $12.23

Beneteau Replacement Propeller Nut Anodes SKU: 531491-25mm

From $11.03

Commercial Plate Stocks SKU: 531489-1/2"-3"

From $16.00

Commercial Hull Anodes SKU: 531487-5.75in-Bolt-On

From $20.61

Commercial Propeller Nut Anodes, Zinc SKU: 531486-2.5"

$170.15

You've viewed 28 of 231 products

Marine Anodes and Zincs

Marine Anodes and Zincs are necessary for preventing galvanic metal corrosion in boat drive systems. We supply anodes for outdrives, sterndrives, propeller shaft and propellers by popular brands like Canada Metals, Martyr Anodes and Aqua-Pacific.

Hull Anodes

Hull Anodes are used when you have underwater fittings bonded together electrically. The hull anode depletes instead of underwater metal fittings. These anodes must be carefully monitored to protect the propeller, through-hulls or the entire hull of metal boats.

Shaft and Prop Anodes

Shaft zincs or anodes are typically fashioned in two pieces and bolted together around the propeller shaft. Propeller zincs may be a ring zinc or a zinc prop nut. Metal rudders, struts and fins are easily protected with zinc anode disks bolted through them.

What is Galvanic Corrosion and Why You Need Anodes?

Sacrificial Zincs or Anodes are used anytime you have different metals that are physically or electrically connected and immersed in water. These submerged metals will cause some amount of electrical current to flow between them. The electrons that make up that current flow are supplied by the loss of one of the metals. Metal is lost in the form of metal ions - directly into the water! Temperature and salinity (how salty the water is) also factor into how rapidly the metal is corroded. This is called galvanic or dissimilar metal corrosion and if left unchecked, it can quickly destroy underwater metals.

Common metals subject to galvanic corrosion are bronze or aluminum propellers on a stainless steel shaft; but rudders, rudder fittings, metal struts, outboards, stern drives as well as heat exchangers and through-hull fittings are also at risk. The way to counteract galvanic corrosion is to add a third metal into the circuit, one that gives up its electrons easier than the metals you want to preserve. This piece of metal is called a sacrificial anode, and most often it is zinc. In fact, most boaters refer to sacrificial anodes simply as zincs.