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 Tecnoseal aluminium Type 2 weld-on sacrificial anode with aluminium mounting strap, designed for aluminium boat hulls. The anode weighs 0.45 kg and has body dimensions of 120 × 78 × 25 mm, with a 230 × 25 mm aluminium weld strip. Its compact teardrop-style body and aluminium strap configuration are intended for direct weld-on installation on aluminium hull structures.
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$ 20.07
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1-2 weeks delivery time Tecnoseal aluminium Ingot Type weld-on sacrificial anodes with integrated mounting strap for hull and transom applications. The range includes four models weighing from 0.70 to 4.50 kg, with anode body dimensions from 190 × 50 × 26 mm to 310 × 140 × 35 mm and strap sizes of 300 × 25 × 5 mm or 400 × 30 × 6 mm. The standard version is supplied with a steel insert, while aluminium or stainless steel inserts are available on request.
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$ 53.04
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1-2 weeks delivery time Tecnoseal Z4-ALAL aluminium Ingot Type weld-on sacrificial anode with aluminium mounting strap, suitable for aluminium hull applications. The anode weighs 0.94 kg and has body dimensions of 149 × 88 × 28 mm, with a 250 × 25 × 5 mm aluminium strap.
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$ 79.86
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1-2 weeks delivery time Tecnoseal 00341AL aluminium weld-on sacrificial anode with two integrated mounting straps for hull and transom applications. The anode weighs 4.50 kg and has body dimensions of 298 × 148 × 30 mm, with an l1 dimension of 120 mm and 260 × 30 × 6 mm straps. The standard version is supplied with steel inserts, while aluminium or stainless steel inserts are available on request.
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$ 176.09
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1-2 weeks delivery time Tecnoseal 00390AL aluminium weld-on sacrificial anode with two integrated mounting straps for hull and transom applications. The anode weighs 11.00 kg and has body dimensions of 365 × 225 × 65 mm. It is fitted with 365 × 30 × 6 mm and 95 × 30 × 6 mm straps. The standard version is supplied with steel inserts, while aluminium or stainless steel inserts are available on request.
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$ 358.71
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1-2 weeks delivery time Tecnoseal 00349AL aluminium weld-on sacrificial anode with two integrated mounting straps for hull and transom applications. The anode weighs 4.50 kg and has body dimensions of 356 × 165 × 30 mm, with an l1 dimension of 125 mm and 260 × 30 × 6 mm straps. The standard version is supplied with steel inserts, while aluminium or stainless steel inserts are available on request.
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$ 194.18
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1-2 weeks delivery time Tecnoseal magnesium Oval Type weld-on sacrificial anodes with integrated mounting strap for hull and transom applications. The range includes five models weighing from 0.43 to 4.00 kg, with anode body dimensions from 110 × 63 × 26 mm to 400 × 152 × 33 mm and strap dimensions from 200 × 25 × 5 mm to 550 × 40 × 6 mm. The 00309UKMG version features a 320 × 150 × 31 mm body with a 475 × 35 × 5 mm strap. Select the required model according to anode body dimensions, weight and strap size.
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$ 58.35
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1-2 weeks delivery time Tecnoseal magnesium Teardrop Type weld-on sacrificial anodes with integrated mounting strap, available in three sizes from 0.30 to 1.00 kg. The range includes body dimensions of 120 × 78 × 25 mm, 135 × 87 × 35 mm and 160 × 100 × 40 mm, with strap sizes of 230 × 25 × 5 mm and 250 × 25 × 5 mm. The standard version is supplied with a steel insert, while aluminium or stainless steel inserts are available on request.
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$ 47.86
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1-2 weeks delivery time Tecnoseal Z4-MGAL magnesium Ingot Type weld-on sacrificial anode with aluminium mounting strap, suitable for aluminium hull applications. The anode weighs 0.63 kg and has body dimensions of 149 × 88 × 28 mm, with a 250 × 25 × 5 mm aluminium strap.
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$ 95.02
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1-2 weeks delivery time Tecnoseal 00341MG magnesium weld-on sacrificial anode with two integrated mounting straps for hull and transom applications. The anode weighs 3.25 kg and has body dimensions of 298 × 148 × 30 mm, with an l1 dimension of 120 mm and two 260 × 30 × 6 mm straps. The standard version is supplied with steel inserts, while aluminium or stainless steel inserts are available on request.
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$ 198.69
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1-2 weeks delivery time Tecnoseal zinc Oval Type weld-on sacrificial anodes with integrated steel strap for hull and transom applications. The range includes 14 models from 0.74 to 12.00 kg, with anode body dimensions from 100 × 60 × 18 mm to 400 × 152 × 33 mm and strap sizes from 200 × 25 × 5 mm to 550 × 40 × 6 mm. The standard version is supplied with a steel insert, while aluminium or stainless steel inserts are available on request.
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$ 78.67
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1-2 weeks delivery time Tecnoseal zinc Spanish Type weld-on sacrificial anodes with integrated insert for hull and transom applications. The range includes six models weighing from 0.50 to 5.00 kg, with anode body dimensions from 120 × 40 × 22.5 mm to 250 × 90 × 50 mm and strap sizes from 205 × 15 × 3 mm to 400 × 30 × 6 mm. The standard version is supplied with a steel insert, while aluminium or stainless steel inserts are available on request.
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$ 37.85
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1-2 weeks delivery time Tecnoseal zinc Teardrop Type weld-on sacrificial anodes with integrated strap, available in seven sizes from 1.00 to 12.00 kg. The range covers anode body dimensions from 120 × 78 × 25 mm to 280 × 175 × 60 mm, with strap sizes from 230 × 25 × 5 mm to 400 × 30 × 6 mm. The standard version is supplied with a steel insert, while aluminium or stainless steel inserts are available on request.
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$ 47.86
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1-2 weeks delivery time Tecnoseal zinc Ingot Type weld-on sacrificial anodes with integrated mounting strap for hull and transom applications. The range includes four models weighing from 1.60 to 10.00 kg, with anode body dimensions from 190 × 50 × 26 mm to 310 × 140 × 35 mm and strap sizes from 300 × 25 × 5 mm to 400 × 30 × 6 mm. The standard version is supplied with a steel insert, while aluminium or stainless steel inserts are available on request.
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$ 92.77
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1-2 weeks delivery time Tecnoseal Z4-ZNAL zinc Ingot Type weld-on sacrificial anode with aluminium mounting strap, designed for aluminium hull applications. The anode weighs 2.25 kg and has body dimensions of 149 × 88 × 28 mm, with a 250 × 25 × 5 mm aluminium strap. The aluminium insert configuration is suitable for welding to aluminium hull structures.
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$ 84.84
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1-2 weeks delivery time Tecnoseal 00341 zinc weld-on sacrificial anode with two integrated mounting straps for hull and transom applications. The anode weighs 10.00 kg and has body dimensions of 298 × 148 × 30 mm, with an l1 dimension of 120 mm and 260 × 30 × 6 mm straps. The standard version is supplied with steel inserts, while aluminium or stainless steel inserts are available on request.
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$ 637.28
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1-2 weeks delivery time Tecnoseal 00390 zinc weld-on sacrificial anode with two integrated mounting straps for hull and transom applications. The anode weighs 24.00 kg and has body dimensions of 365 × 225 × 65 mm. It is fitted with 365 × 30 × 6 mm and 95 × 30 × 6 mm straps. The standard version is supplied with steel inserts, while aluminium or stainless steel inserts are available on request.
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$ 1,052.63
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1-2 weeks delivery time Tecnoseal 00349 is a zinc weld-on sacrificial anode with 2 straps, designed for reliable corrosion protection in marine applications. The anode weighs 10.00 kg and features body dimensions of 356 × 125 × 165 mm with a height of 30 mm. It is supplied with 2 straps sized 260 × 30 × 6 mm. The standard version comes with a steel insert, while aluminium or stainless steel inserts are available on request.
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$ 560.57
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1-2 weeks delivery time The Tecnoseal 00630 Series consists of zinc suspended hang-on anodes supplied with a 6 m (19.65 ft) cable. The 00630 version weighs 2.55 kg (5.62 lbs) and measures H105 × Ø80 mm with Ø1 = 55 mm, while the larger 00630-4 version weighs 3.70 kg (8.16 lbs) and measures H133 × Ø90 mm with Ø1 = 56 mm. The listed weights refer to the anode only.
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$ 202.78
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1-2 weeks delivery time The Tecnoseal 00633 / 00634 range consists of zinc suspended hang-on anodes supplied with a 6 m (19.65 ft) cable. The 00633 version weighs 1.00 kg (2.20 lbs) and measures 190 × 38 × 19 mm, while the larger 00634 version weighs 4.00 kg (8.82 lbs) and measures 190 × 100 × 30 mm.
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$ 86.54
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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.