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 The MME Round Aluminium Hull and Rudder Anode is a sacrificial anode designed to protect steel boat hulls and rudders against corrosion in brackish and saltwater environments. Available in six variants with external diameters of 100, 138, 160 and 230 mm and heights of 25 or 35 mm. The range includes MME04AB (Ø100 × 25 mm), MME12AB (Ø160 × 25 mm), MME08AB (Ø138 × 35 mm), MME16AB (Ø160 × 35 mm), MME28AB (Ø230 × 25 mm) and MME37AB (Ø230 × 35 mm). All models feature a round aluminium body and are specifically listed for steel hull applications. Each anode is supplied individually.
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$ 22.54
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1-2 weeks delivery time The MME Round Zinc Hull and Rudder Anodes are designed to provide sacrificial corrosion protection for boat hulls, rudders and underwater metal components. Manufactured from zinc, the range includes eight models with diameters of 50, 70, 100, 138, 160 and 230 mm and body heights of 25 or 35 mm, depending on the selected variant. Available models include MME03ZB (Ø50 × 35 mm), MME05ZB (Ø70 × 35 mm), MME1ZB (Ø100 × 25 mm), MME27ZB (Ø160 × 25 mm), MME2ZB (Ø138 × 35 mm), MME41ZB (Ø160 × 35 mm), MME71ZB (Ø230 × 25 mm) and MME89ZB (Ø230 × 35 mm). Each anode is supplied individually.
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$ 28.89
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1-2 weeks delivery time The MME Aluminium Teardrop Weld-On Anode is designed for sacrificial corrosion protection of steel boat hulls and rudders. It combines an aluminium anode body with a steel mounting strip for welded installation on steel hulls. Available in six models with body dimensions ranging from 120 × 40 × 25 mm to 220 × 75 × 38 mm, including wider versions measuring 200 × 95 × 30 mm, 200 × 70 × 30 mm and 200 × 80 × 40 mm. Depending on the model, the steel mounting strip measures 200, 230, 260 or 300 mm in length, with widths of 10, 20 or 25 mm and a uniform thickness of 3 mm. Each anode is supplied individually.
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$ 17.26
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1-2 weeks delivery time The MME Aluminium Teardrop Weld-On Anode is designed for sacrificial corrosion protection of aluminium boat hulls and rudders. It features an aluminium anode body with an aluminium mounting strip for welded installation on aluminium structures. Available in four models with body dimensions of 200 × 40 × 25 mm (MME02AA), 180 × 60 × 32 mm (MME04AA), 220 × 75 × 38 mm (MME08AA) and 200 × 95 × 30 mm (MME12AA). Mounting strip lengths range from 200 to 300 mm, depending on the model. Each anode is supplied individually.
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$ 36.40
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1-2 weeks delivery time The MME MME17AA Aluminium Weld-On Anode is designed to provide sacrificial corrosion protection for aluminium boat hulls and rudders. It features a rectangular aluminium anode body measuring 290 × 90 × 40 mm with an aluminium mounting strip measuring 440 × 30 × 5 mm. The extended strip provides the mounting arrangement for welded installation on aluminium hulls. Product number 1729. Supplied individually.
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$ 76.76
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1-2 weeks delivery time The MME Aluminium Rectangular Weld-On Anode is designed for sacrificial corrosion protection of steel boat hulls and rudders. It combines a rectangular aluminium anode body with an extended steel mounting strip for welded installation on steel hulls. Available in two models: MME17A (290 × 100 × 40 mm) with a 440 × 30 × 5 mm mounting strip and MME26A (270 × 150 × 33 mm) with a 405 × 40 × 5 mm mounting strip. Both models feature a 5 mm thick steel strip and are supplied individually.
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$ 46.34
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1-2 weeks delivery time The MME Aluminium Weld-On Hull and Rudder Anodes are designed to provide sacrificial corrosion protection for steel-hulled vessels in saltwater and brackish water environments. The range includes 10 models with elongated aluminium alloy bodies featuring rounded ends, measuring 400–920 mm in length, 104–150 mm in width and 33–95 mm in height. Each anode incorporates a mild steel mounting insert with an overall length of 500–1075 mm, a width of 30 or 40 mm and a thickness of 5 mm. Nominal net weights range from 4 to 21 kg, depending on the model. Available in different body dimensions and mounting configurations for welded installation on steel hulls and rudders.
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$ 81.84
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1-2 weeks delivery time The MME MME26AA Aluminium Hull and Rudder Anode is designed to provide sacrificial corrosion protection for aluminium-hulled vessels. It features a rectangular aluminium body measuring 270 × 150 × 33 mm and an extended mounting strip with a specified length of 405 mm. The anode is intended for hull and rudder applications on aluminium vessels. Product number MME26AA, EAN 8720193041643. Supplied individually.
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$ 93.61
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1-2 weeks delivery time The MME Zinc Teardrop Weld-On Hull and Rudder Anodes are designed to provide sacrificial corrosion protection for boat hulls and rudders in saltwater environments. Manufactured from zinc specified to meet U.S. Mil A Spec.1800 1J requirements, the anodes feature teardrop-shaped bodies with extended mounting strips for welded installation. Available in seven models with body lengths of 120–275 mm, widths of 40–175 mm and heights of 25–51 mm. Mounting strip lengths range from 200 to 405 mm, depending on the selected model. The range includes MME0Z, MME1Z, MME2Z, MME3Z, MME20ZB, MME10Z and MME10ZB. Each anode is supplied individually.
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$ 21.23
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1-2 weeks delivery time The MME Rectangular Zinc Weld-On Anode is designed to provide sacrificial corrosion protection for boat hulls and rudders in saltwater environments. The zinc anodes are specified to meet U.S. Mil A Spec.1800 1J requirements and feature an extended mounting strip for welded installation. Three models are available: MME5Z (290 × 90 × 40 mm) with a 440 × 30 × 5 mm mounting strip, MME6Z (200 × 150 × 35 mm) with a 330 mm strip and MME16Z (425 × 165 × 38 mm) with a 550 mm strip. Each model is supplied individually.
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$ 88.55
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1-2 weeks delivery time The MME Rectangular Zinc Weld-On Anodes are designed to provide sacrificial corrosion protection for marine metal structures. Manufactured from zinc, the anodes feature rectangular bodies with extended mounting strips for welded installation. The range includes nine models with body lengths from 200 to 920 mm, widths from 85 to 155 mm and heights from 30 to 51 mm. Mounting strip lengths range from 310 to 1075 mm, depending on the selected model. Available variants include MME4Z, MME4ZS, MME5ZS, MME8Z, MME10ZS, MME11Z, MME20Z, MME25Z and MME35Z. Each anode is supplied individually.
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$ 575.32
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1-2 weeks delivery time E. Polipodio AN029 zinc shaft collar anode for Ø90 mm shaft installations, cross-referenced in the Trem catalogue as L8105090. The split anode has an internal diameter A of Ø90 mm, an overall outside diameter B of Ø128 mm and an overall height H of 100 mm. Manufactured from zinc (ZN).
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$ 177.17
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1-2 weeks delivery time E. Polipodio zinc spare shaft anodes for Radice shaft installations, supplied as anode only and available for shaft sizes from Ø22–25 mm up to Ø60 mm. The range includes RA-1E, RA-2E, RA-2GE, RA-3E, RA-4E, RA-5E, RA-5GE and RA-6E configurations. Depending on the model, dimension A ranges from 32 to 82 mm, B from 26 to 64 mm, E from 23 to 56 mm and overall height H from 39 to 96 mm. E. Polipodio references RA030, RA031, RA032, RA033, RA034, RA035, RA060 and RA036 correspond to Trem references L8110625, L8110630, L8110635, L8110640, L8110645, L8110650, L8110655 and L8110660 respectively. Select the required version according to shaft diameter, model and A, B, E and H dimensions.
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$ 10.99
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1-2 weeks delivery time E. Polipodio Radice conical shaft nut zinc anodes for shaft diameters from Ø25 to Ø60 mm. The range includes eight versions with overall diameter A from 32 to 82 mm, internal dimension B from 16 to 46 mm, lower internal dimension C from 25 to 71 mm and overall height H from 39 to 95 mm. All variants are manufactured in zinc and are selected primarily according to the propeller shaft diameter. Trem references L8110225–L8110260 correspond to E. Polipodio articles RA002, RA005, RA008, RA011, RA014, RA017, RA020 and RA023.
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$ 7.52
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1-2 weeks delivery time E. Polipodio stainless steel washers for Radice shaft anodes, available in eight sizes for models from Ø25 to Ø60 mm. Depending on the version, outside diameter A ranges from Ø38 to Ø90 mm, internal diameter B from Ø17 to Ø46 mm and K dimension from 5.8 to 16 mm. Polipodio references RA003, RA006, RA009, RA012, RA015, RA018, RA021 and RA024 correspond to Trem references L8115016, L8115020, L8115024, L8115025, L8115033, L8115037, L8115040 and L8115045 respectively. Select the required washer according to Radice model size and A, B and K dimensions.
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$ 7.91
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1-2 weeks delivery time E. Polipodio AX004 aluminium sacrificial anode for hull and stern frame applications. The anode measures 320 x 65 x 35 mm and weighs 1.2 kg, providing a large-format aluminium anode configuration for marine hull and stern installations.
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$ 84.28
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1-2 weeks delivery time E. Polipodio MG004 magnesium sacrificial anode for hull and stern frame applications. The anode measures 320 x 65 x 35 mm and weighs 0.7 kg, providing a lightweight magnesium configuration for marine hull and stern installations.
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$ 70.06
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1-2 weeks delivery time E. Polipodio rectangular zinc sacrificial anodes for marine flap installations, available in four sizes. The range includes anode body dimensions of 73x48x10 mm, 110x67x20 mm, 130x50x17 mm and 190x54x24 mm, with mounting-hole centre distances (C) of 50, 57, 77 and 76 mm respectively. Anode weights range from 0.330 to 1.450 kg. Select the required version according to length A, width B, height D, mounting-hole spacing C and weight.
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$ 32.06
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1-2 weeks delivery time E. Polipodio NC019 zinc anode for rudders and flaps, model FP-1 and cross-referenced in the Trem catalogue as L8120206. The rectangular anode measures 110 x 70 x 20 mm and features two Ø7 mm mounting holes with 57 mm centre-to-centre spacing. Manufactured from zinc (ZN) for rudder and flap installations.
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$ 36.02
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1-2 weeks delivery time E. Polipodio zinc anode for rudders and flaps, model FX-2V, with an overall size of 150 x 60 x 25 mm and a weight of 1.00 kg. The anode features two mounting points positioned 80 mm centre-to-centre, with the catalogue drawing specifying Ø11x15 and Ø11 mounting-hole dimensions. Manufactured from zinc (ZN) for rudder and flap installations.
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$ 31.83
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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.