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 Hollex Type V 08C Aluminium Anode is a round sacrificial anode designed to protect boat hulls, rudders and other metal components against corrosion in brackish water environments. Manufactured from aluminium, it measures 80 mm in diameter and 45 mm in height. The anode features a central mounting recess and provides sacrificial corrosion protection by corroding preferentially to the protected metal components. Suitable for freshwater and saltwater mixtures and supplied individually.
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$ 29.50
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1-2 weeks delivery time The Hollex ZD76 Zinc Anode ZX019 is a rectangular sacrificial anode designed to protect boat hulls, rudders and other metal components against corrosion in saltwater environments. Manufactured from zinc, the anode measures 200 × 65 × 35 mm (L × W × H) and features a bolt spacing of 110 mm. It provides sacrificial corrosion protection by corroding preferentially to the protected metal components. Supplied individually.
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$ 40.03
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1-2 weeks delivery time The Hollex Type V Zinc Anode is a rectangular sacrificial anode designed for corrosion protection of boat hulls and rudders in saltwater environments. Available in three models: V 15C (150 × 60 × 25 mm), V 25C (250 × 65 × 38 mm) and V 35C (250 × 70 × 38 mm). The anodes feature two mounting holes with centre-to-centre spacings of 80, 140 or 200 mm, depending on the model. Manufactured from zinc, these anodes provide sacrificial corrosion protection for metal components and are supplied individually.
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$ 25.28
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1-2 weeks delivery time The Hollex Round Zinc Anodes are sacrificial anodes designed to protect boat hulls, rudders and other metal components against corrosion in saltwater environments. Available in two models: Type V 08C (Ø80 × 45 mm) and Type V FBC1 (Ø86 × 56 mm). Manufactured from zinc, these round anodes provide sacrificial corrosion protection by corroding preferentially to the protected metal components. The FBC1 model additionally specifies an As Diameter of 56 mm. Both models are supplied individually.
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$ 39.60
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1-2 weeks delivery time The Hollex Aluminium Weld-On Anode is a rectangular sacrificial anode designed for welded installation on boat hulls and rudders to protect metal components against corrosion in brackish water. Available in five models with body dimensions ranging from 110 × 60 × 28 mm to 200 × 95 × 25 mm, including a 150 × 90 × 40 mm version. The anodes feature welding strips with lengths of 190 or 300 mm. Models FAL-06, FAL-09, FAL-1 and FAL-14 have a strip width of 30 mm and a strip D dimension of 5 mm. Manufactured from aluminium for sacrificial corrosion protection.
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$ 18.96
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1-2 weeks delivery time The Hollex Magnesium Weld-On Anode is a rectangular sacrificial anode designed for welded installation on boat hulls and rudders to protect metal components against corrosion in freshwater environments. Available in two models: MGF-1 (110 × 60 × 28 mm) with a 190 mm welding strip and MGF-3 (180 × 65 × 30 mm) with a 300 mm welding strip. Both versions feature a strip width of 30 mm and a strip D dimension of 5 mm. Manufactured from magnesium and supplied individually, these anodes are suitable for freshwater applications, including lakes and rivers.
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$ 24.85
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1-2 weeks delivery time The Hollex Zinc Weld-On Anode is a rectangular sacrificial anode designed for welded installation on boat hulls and rudders to protect metal components against corrosion in saltwater environments. Available in five models (F1, F1-2, F1-3, FR-2 and F-2.7), with body dimensions ranging from 110 × 60 × 28 mm to 200 × 95 × 25 mm. Depending on the model, the anodes feature welding strips measuring 190, 290 or 300 mm in length, with a uniform strip width of 30 mm and a D dimension of 5 mm. Manufactured from zinc and supplied individually for marine corrosion protection.
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$ 31.60
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1-2 weeks delivery time Osculati bolt-on zinc sacrificial anodes fitted with a rubber plate, available in five sizes for marine bolt-on installations. The range includes models from 147 to 300 mm in length, 65 to 160 mm in width and 22 to 32 mm in height, with weights from 1.2 to 8.0 kg. Hole spacing ranges from 70 to 160 mm, with mounting-hole sizes of 13x35 mm, 19x25 mm or 17x25 mm depending on the model. Select the required Osculati anode according to overall dimensions, hole spacing, mounting-hole size and weight.
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$ 61.77
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1-2 weeks delivery time Super Marine aluminium narrow shaft collar anodes designed for sacrificial corrosion protection of marine propeller shafts where installation space is limited. Available for Ø22, Ø25 and Ø30 mm shafts, all with a 15 mm collar thickness. The range includes aluminium anodes weighing from 88 to 120 g, supplied in bulk.
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$ 18.23
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1-2 weeks delivery time Super Marine aluminium rounded shaft anodes for sacrificial corrosion protection of marine propeller shafts. The range includes metric shaft diameters from Ø22 to Ø60 mm plus a 1-3/4" imperial version, with aluminium weights from 150 g to 1.09 kg. Depending on the model, the anodes are supplied packaged or in bulk with mounting screws.
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$ 17.82
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1-2 weeks delivery time Super Marine zinc narrow shaft collar anodes designed for sacrificial corrosion protection where installation space around the propeller shaft is limited. The range covers shaft diameters from Ø19 to Ø60 mm with collar thicknesses from 15 to 27.5 mm. Selected Ø25 and Ø30 mm sizes are available both packaged and in bulk versions, while the remaining models are supplied packaged.
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$ 17.16
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1-2 weeks delivery time Super Marine zinc shaft rounded anodes for sacrificial corrosion protection of marine propeller shafts. The range covers shaft diameters from Ø19 to Ø90 mm, including metric and imperial-equivalent sizes, with zinc weights from 0.31 to 4.16 kg. Depending on the model, the anodes are supplied packaged or in bulk with mounting screws, with selected shaft sizes available in both configurations.
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$ 12.15
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1-2 weeks delivery time Super Marine aluminium bolt-on bar anodes for marine sacrificial corrosion protection, available in three sizes from 200 to 455 mm in length. The range includes 200x80x25, 305x76x41 and 455x100x40 mm versions with mounting centre distances of 80, 200 and 230 mm. Anode weights range from 1.1 to 4.71 kg.
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$ 181
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1-2 weeks delivery time Martyr aluminium bolt-on plate anodes for marine sacrificial corrosion protection, available in two sizes. ANOAH1701 measures 65x65x10 mm with a 51 mm mounting centre distance and weighs 94 g, while ANOAH1704 measures 155x65x15 mm with a 118 mm mounting centre distance and weighs 320 g.
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$ 43.78
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1-2 weeks delivery time Martyr aluminium sacrificial anodes for Vetus-type marine installations, available in Type 8 and Type 150 versions. ANOAH1650 is a conical Type 8 anode measuring Ø80x45 mm and weighing 400 g. ANO881905 is a Type 150 bolt-on bar anode measuring 150x60x25 mm with an 80 mm mounting centre distance and weighing 406 g.
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$ 30.59
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1-2 weeks delivery time Martyr ANOAH1200 aluminium heart-shaped sacrificial anode for marine corrosion protection. The anode measures 140x95x42 mm, has a 225 mm mounting centre distance and weighs 800 g. VDM code: ANOAH1200.
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$ 40.70
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1-2 weeks delivery time Martyr ANOMG1945 magnesium bolt-on bar anode for marine sacrificial corrosion protection. The anode measures 450x90x40 mm, has a 230 mm mounting centre distance and weighs 2.3 kg. Supplied in bulk under VDM code ANOMG1945.
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$ 219.57
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1-2 weeks delivery time Super Marine zinc bolt-on bar anodes for marine sacrificial corrosion protection, available in ten sizes with lengths from 75 to 455 mm and weights from 0.25 to 11 kg. The range includes different width, height and mounting centre-distance configurations for selection according to the required installation dimensions.
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$ 45.73
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1-2 weeks delivery time Super Marine zinc bolt-on plate anodes for marine sacrificial corrosion protection, available in six sizes from 65x65x10 to 300x150x28 mm. Mounting centre distances range from 50 to 160 mm and zinc weights from 200 g to 8 kg. The different dimensional configurations allow selection according to the required mounting pattern and available installation space.
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$ 18.84
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1-2 weeks delivery time Super Marine zinc sacrificial anodes for Vetus applications, available in Type 8, Type 150 and Type 250 configurations. Type 8 measures Ø80x45 mm and weighs 1 kg, with plate-packed and bulk versions available. Type 150 measures 150x60x25 mm and weighs 1 kg, while Type 250 measures 250x65x30 mm and weighs 2.3 kg.
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$ 34.42
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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.