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 Plastimo zinc bolt-on sacrificial anodes for marine corrosion protection, available in four sizes and weights. Plastimo 38268 measures 200x65x35 mm and weighs 1.2 kg, 38269 measures 290x55x30 mm and weighs 3 kg, 38270 measures 320x65x35 mm and weighs 2.4 kg, while 40282 measures 325x80x35 mm and weighs 5 kg.
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$ 64.34
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1-2 weeks delivery time Plastimo zinc bar sacrificial anodes for Vetus Series applications, available in 1 kg, 2.4 kg and 2.7 kg versions. Plastimo 401794 corresponds to OEM reference NC021 and has a height of 25 mm, while Plastimo 401949 corresponds to OEM reference NC022 and has a height of 28 mm. Plastimo 420950 weighs 2.7 kg and measures 290x55x30 mm. Plastimo 401794 and 401949 are specified as zinc anodes compliant with MIL-A-18001K.
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$ 22.44
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1-2 weeks delivery time Plastimo zinc sacrificial anodes for transom applications, available in five configurations weighing from 2.5 to 4.5 kg. The range includes Plastimo 420909, 420907, 420908, 420902 and 420911 with catalogue diameters from Ø135 to Ø140 mm and different heights and mounting configurations. OEM references include NC012, NC005 + BOUCHON COUP, NC004 and NC014. The zinc material is specified by Plastimo as compliant with MIL-A-18001K.
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$ 120.90
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1-2 weeks delivery time Plastimo trim tab sacrificial anodes for Riva and Saipem series applications, available in six configurations from 0.26 to 2.8 kg. The range includes Plastimo 38265, 420140, 420701, 420702, 420708 and 476510 with lengths from 100 to 220 mm, widths from 34 to 70 mm and heights from 15 to 30 mm. Catalogue drilling diameters range from 5 to 18 mm, with fixing centres from 50 to 160 mm depending on the model.
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$ 39.43
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1-2 weeks delivery time Plastimo aluminium disc anodes for marine corrosion protection, available in three configurations. Plastimo 53052 measures Ø110x25 mm, Plastimo 177386 measures Ø110x31 mm with Ø36 mm and Ø14.5 mm internal diameters and weighs 390 g, while Plastimo 53053 measures Ø150x29 mm. The Plastimo disc-anode range is supplied in pairs with screw.
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$ 47.35
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1-2 weeks delivery time Plastimo 53055 magnesium disc anodes supplied as a pair with screw. Each anode has an outside diameter of 100 mm and a height of 25 mm. The catalogue weight for the set is 0.56 kg. OEM reference: MG018C.
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$ 58.96
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1-2 weeks delivery time Plastimo zinc disc anodes supplied as a pair with screw, available in two sizes. Plastimo 420011 measures Ø120x22 mm, while Plastimo 420621 measures Ø140x26 mm with a 12 mm drilling diameter. Select the appropriate version according to the required outside diameter, height and mounting dimensions.
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$ 62.28
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1-2 weeks delivery time Crosseven zinc rosette disc sacrificial anodes for protecting marine rudders and steering components from galvanic corrosion. The range covers external diameters from Ø50 to Ø125 mm and heights from 10 to 22 mm, with single-unit and paired configurations available depending on size. Pair versions are offered either packaged or in bulk, while Ø50 and Ø70 mm are also available as individual bulk anodes. The zinc anodes are injection-moulded in accordance with MIL-A-18001K and the Crosseven catalogue specifies stainless-steel mounting bolts.
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$ 31.80
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1-2 weeks delivery time Plastimo aluminium weld-on bar anodes with integrated galvanised steel fixing straps, available in four weights from 0.6 to 2.2 kg. Plastimo 38374 corresponds to OEM reference AS009 VRAC, 38375 to AS008 VRAC, 38376 to AS007 VRAC and 38377 to AS017 VRAC. The elongated aluminium anode body is mounted on a steel strap extending from both ends for weld-on installation.
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$ 27.82
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1-2 weeks delivery time Plastimo magnesium weld-on bar anodes with integrated galvanised steel fixing straps, available in four weights from 0.3 to 1.8 kg. Plastimo 38387 corresponds to OEM reference MG002 VRAC, 38388 to MG001 VRAC, 38389 to MG008 VRAC and 38390 to MG007 VRAC. The elongated magnesium anode body is mounted on a steel strap extending from both ends for weld-on installation.
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$ 22.44
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1-2 weeks delivery time Plastimo zinc weld-on sacrificial anodes with integrated galvanised steel fixing straps, available in seven configurations from 0.6 to 3.3 kg. The range includes Plastimo 38214, 38215, 38216, 40236, 39338, 476512 and 420915, with different anode dimensions and steel strap sections. Corresponding OEM references are ZS033 VRAC, ZS031 VRAC, ZS028 VRAC, ZS034, ZS052, ZS030 and ZS059. The zinc is specified by Plastimo as compliant with MIL-A-18001K.
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$ 22.84
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1-2 weeks delivery time Plastimo trapezoidal zinc weld-on sacrificial anodes with integrated galvanised steel fixing straps, available in five versions from 0.3 to 2.5 kg. Plastimo 38220 has catalogue dimensions 150x110x35x15 mm with a 20x3 mm steel strap and an additional 185 mm catalogue dimension; 38221 is 170x120x45x21 mm with a 20x3 mm strap and 185 mm dimension; and 38222 is 210x160x90x30 mm with a 20x3 mm strap and 185 mm dimension. Plastimo 420913 measures 300x200x50x35 mm with a 25x4 mm strap, while 40237 measures 300x200x70x35 mm with a 25x4 mm strap.
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$ 15.38
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1-2 weeks delivery time Plastimo 420994 hanging anode assembly weighing 0.98 kg, supplied with a 6 m stainless steel cable protected by a PVC sheath and fitted with a grounding lug. Designed as a suspended anode solution for marine installations where a remote electrical connection is required.
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$ 86.25
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1-2 weeks delivery time Plastimo 420995 magnesium hanging anode weighing 1 kg, supplied with a 4 m stainless steel cable protected by a PVC sheath and fitted with a grounding lug. The complete hanging-anode assembly is intended for marine corrosion protection where a suspended anode with remote electrical connection is required.
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$ 106.68
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1-2 weeks delivery time Plastimo hanging anodes supplied with PVC-sheathed stainless steel cables and grounding lugs. Plastimo 38266 is a 1.4 kg ingot-shaped hanging anode supplied with a 2 m cable and corresponds to OEM reference NC060 VRAC. Plastimo 38267 is a 2.2 kg cone-shaped hanging anode supplied with a 4 m cable and corresponds to OEM reference NC038 VRAC.
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$ 110.02
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1-2 weeks delivery time Allpa spherical aluminium sacrificial anodes for marine propeller shafts, available for shaft diameters from Ø20 to Ø60 mm. The range includes twelve metric sizes: 20, 22, 25, 30, 32, 35, 38, 40, 45, 50, 55 and 60 mm. Each model uses the same split spherical shaft-anode configuration and is selected according to the required propeller shaft diameter.
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$ 26.33
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1-2 weeks delivery time Allpa flat ring-shaped aluminium sacrificial anodes for marine propeller shafts, available for shaft diameters from Ø20 to Ø50 mm. The range includes seven metric sizes: 20, 25, 30, 35, 40, 45 and 50 mm. Each model uses a split low-profile ring configuration for installation around the shaft and is selected according to the required propeller shaft diameter.
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$ 24.30
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1-2 weeks delivery time Allpa spherical magnesium sacrificial anodes for marine propeller shafts, available for shaft diameters from Ø20 to Ø50 mm. The range includes ten metric sizes: 20, 22, 25, 30, 32, 35, 38, 40, 45 and 50 mm. Each model uses the same split spherical shaft-anode configuration and is selected according to the required propeller shaft diameter.
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$ 42.52
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1-2 weeks delivery time Allpa ring-shaped magnesium sacrificial anodes for marine propeller shafts, available for shaft diameters of Ø25, Ø30, Ø35 and Ø40 mm. Each version uses a split ring configuration for installation around the shaft and is selected according to the required propeller shaft diameter.
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$ 35.44
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1-2 weeks delivery time Allpa spherical zinc sacrificial anodes for marine propeller shafts, available for shaft diameters from Ø20 to Ø60 mm. The range includes twelve metric sizes: 20, 22, 25, 30, 32, 35, 38, 40, 45, 50, 55 and 60 mm. Each version uses the same spherical shaft-anode configuration and is selected according to the required shaft diameter.
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$ 14.72
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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.