Marine anodes, including zinc, aluminum, and magnesium anodes, are sacrificial metal components used to protect the hull and underwater metal parts of boats and yachts from galvanic corrosion. By corroding preferentially, the anodes help protect more valuable submerged components such as hull fittings, propeller shafts, rudders, trim tabs, and other bonded metal parts.
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1-2 weeks delivery time Super Marine zinc stern disc anodes for Baglieto / Guy Couach applications, available in Ø125 and Ø140 mm versions. Both variants have a height of 38 mm. The Ø125 mm anode weighs 2.7 kg, while the Ø140 mm version weighs 3.1 kg.
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$ 113.37
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1-2 weeks delivery time Martyr ANO1600 zinc heart-shaped sacrificial anode for marine corrosion protection. The anode measures 110x67 mm, has a 27 mm mounting centre distance and weighs 463 g. VDM code: ANO1600.
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$ 20.42
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1-2 weeks delivery time Super Marine ANO1200 zinc heart-shaped sacrificial anode for marine corrosion protection. The anode measures 140x95 mm, has a 225 mm mounting centre distance and weighs 2.2 kg. VDM code: ANO1200.
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$ 59.19
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1-2 weeks delivery time Super Marine zinc bolt-on stern anodes for Twin Disc Arneson applications, available in two sizes. VDM ANO140 measures 156x32x31 mm with an 89 mm mounting centre distance and weighs 602 g. VDM ANO1401 measures 191x46x47 mm with a 127 mm mounting centre distance and weighs 1703 g.
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$ 31.99
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1-2 weeks delivery time Super Marine aluminium hanging sacrificial anodes for marine corrosion protection, available in two configurations. ANOAH1500 measures 195.6x74.2x48.1 mm, weighs 1.22 kg and is supplied with a 3 m stainless steel cable. ANOAA12B is a 500 mm long, 35 mm diameter hanging anode weighing 1.7 kg.
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$ 271.05
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1-2 weeks delivery time Martyr zinc machinable anode plates measuring 300x150 mm, available in three thicknesses: 16.5, 20 and 25 mm. The corresponding zinc weights are 4.5, 6.4 and 7.6 kg. The solid plate format is suitable for machining or adapting to the required marine installation.
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$ 184.24
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1-2 weeks delivery time Martyr aluminium rosette disc anodes for sacrificial corrosion protection of marine underwater metal components. Available in four sizes from Ø75 to Ø125 mm with weights from 167 to 804 g. The Ø75, Ø90 and Ø110 mm versions are supplied packaged, while the Ø125 mm version is supplied as an individual bulk unit.
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$ 13.65
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1-2 weeks delivery time Martyr ANOAH605 aluminium rudder plate anode for sacrificial corrosion protection of marine rudder components. The plate measures 82 x 56 mm with a 48 mm mounting centre distance and weighs 64 g. The two-hole mounting configuration is designed for direct installation on compatible rudder assemblies.
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$ 7.28
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1-2 weeks delivery time Super Marine zinc rosette disc anodes for sacrificial corrosion protection of marine underwater metal components. The zinc range includes outside diameters from Ø50 to Ø190 mm with weights from 167 g to 4.00 kg. Depending on the model, the anodes are supplied packaged, as individual bulk units or in bulk with mounting screws. VDM catalogue codes include ANO601, ANO600, ANO602, ANO620, ANO630, ANO632, ANO50100U, ANO50100 and ANO60100.
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$ 9.74
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1-2 weeks delivery time Super Marine ANO605 zinc rudder plate anode for sacrificial corrosion protection of marine rudder components. The anode measures 82 x 56 mm with a 48 mm mounting centre distance, 16 mm height and 0.17 kg weight. It features two mounting holes for attachment to the rudder assembly.
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$ 8.48
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1-2 weeks delivery time Martyr aluminium weld-on sacrificial anodes for marine corrosion protection, available in two sizes. ANOAH905 measures 118x80x26 mm and weighs 0.52 kg, while ANOAH910 measures 144x92x44 mm and weighs 0.90 kg. Both variants are supplied in bulk.
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$ 58.12
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1-2 weeks delivery time Super Marine zinc weld-on sacrificial anodes for marine corrosion protection, available in six sizes from 80x75x20 to 295x90x40 mm. Zinc weights range from 0.8 to 5.95 kg, providing a choice of compact and larger weld-on configurations for different marine installations.
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$ 31.39
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1-2 weeks delivery time Super Marine mounting kits for marine anode installation, available for ANO881930, ANO881905, ANO88632 and AA30 anodes. The kits isolate the anode from the hull and use aluminium fastening hardware. Select the correct kit according to the corresponding anode reference.
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$ 62.44
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1-2 weeks delivery time Plastimo zinc shaft anodes for marine propeller shafts, available for metric and imperial shaft diameters from Ø28 to Ø70 mm and from 1 1/8" to 2 1/2". The range includes outside diameters from Ø56 to Ø122 mm and heights from 56 to 108 mm. Available models include Plastimo 38229, 38240, 405434, 405436, 405438, 420815 and 420870, with OEM references AN006 SP, AN019 SP, AN018, AN020, AN023, AN007 and AN025 respectively.
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$ 16.83
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1-2 weeks delivery time Plastimo zinc collar sacrificial anodes for marine shaft applications, available with 20 mm and 40 mm internal diameters. Plastimo 38256 has an internal diameter of Ø20 mm and a height of 15 mm and corresponds to OEM reference AV002 SP. Plastimo 38261 has an internal diameter of Ø40 mm and a height of 18 mm and corresponds to OEM reference AV010 SP. Mounting screws are included.
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$ 8.54
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1-2 weeks delivery time Crosseven zinc shaft clamp sacrificial anodes for marine propeller shafts, available for shaft diameters from Ø19 to Ø65 mm as well as 1-3/4" shafts. Depending on the version, external diameter ranges from Ø62 to Ø100 mm, height from 60 to 100 mm and weight from 0.538 to 1.71 kg. Most models use two mounting holes, while the Ø60 and Ø65 mm versions use four. Selected shaft sizes are available in both packaged and bulk configurations. The anodes are injection-moulded from zinc alloy in accordance with MIL-A-18001K and are supplied with A2 stainless-steel mounting hardware.
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$ 13.51
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1-2 weeks delivery time Crosseven conical zinc shaft end sacrificial anodes for marine propulsion shafts, available for shaft diameters from Ø22–25 mm up to Ø100 mm. The range includes packaged and bulk versions, with heights from 39 to 98 mm and weights from 0.14 to 2.22 kg. The anodes are manufactured from zinc alloy by injection moulding in accordance with MIL-A-18001K and are intended for sacrificial corrosion protection of marine shaft installations. Plastimo recommends replacement at least once per year.
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$ 7.71
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1-2 weeks delivery time Crosseven hexagonal zinc shaft end sacrificial anodes for marine propulsion shafts, available for shaft diameters from Ø22–25 mm to Ø60 mm. The range includes bulk and packaged versions, with external diameters from Ø33 to Ø82 mm, heights from 39 to 98 mm and weights from 0.12 to 1.66 kg. The anodes are injection-moulded from zinc alloy in accordance with MIL-A-18001K for sacrificial corrosion protection of marine shaft installations.
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$ 9.29
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1-2 weeks delivery time Plastimo aluminium bolt-on sacrificial anodes for marine corrosion protection, available in three sizes. Plastimo 38383 measures 200x65x35 mm and weighs 0.55 kg, Plastimo 38384 measures 320x65x35 mm and weighs 1 kg, while Plastimo 177390 measures 455x100x60 mm and weighs 5 kg. The 38384 is specified for Fairline applications, while the 177390 is listed for Fairline and Sunseeker boats.
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$ 33.21
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1-2 weeks delivery time Plastimo magnesium bolt-on sacrificial anodes for marine corrosion protection, available in three sizes. Plastimo 38392 measures 200x65x35 mm and weighs 0.4 kg, Plastimo 38393 measures 320x65x35 mm and weighs 0.7 kg, while Plastimo 38394 measures 325x80x35 mm and weighs 1.6 kg.
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$ 42.35
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How do Aluminum, Zinc, and Magnesium Anodes differ in protecting a boat?
Aluminum, zinc, and magnesium anodes all provide cathodic protection by acting as sacrificial metals, but their effectiveness depends on the water type and their electrochemical potential. Zinc anodes are traditionally used in saltwater and provide reliable protection in high-salinity environments. Aluminum anodes are more electrochemically active than zinc and offer a higher protective capacity for their weight, making them suitable for saltwater and brackish water and, with the correct alloy, many freshwater applications. Magnesium is the most active of the three materials and is primarily intended for freshwater, where its higher driving voltage provides effective protection in low-conductivity conditions. Magnesium anodes should generally not be used in saltwater or brackish water, as they may provide excessive protection and be consumed too rapidly.
Why is anode placement on the hull plate important for effective corrosion protection?
Correct anode placement is essential because sacrificial anodes must be electrically connected to the metal they protect and positioned where protective current can reach exposed underwater surfaces effectively. On metal hulls, anodes should be distributed around areas that are most susceptible to galvanic corrosion, including the hull plating, rudder, propeller shaft, stern gear, and other submerged metal components. Poorly positioned, undersized, or electrically isolated anodes may leave parts of the structure insufficiently protected. Proper distribution helps maintain a more uniform protective potential across the underwater metalwork and reduces the risk of localized corrosion.