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 MG Duff 40ZHD Zinc Block Anode is a rectangular sacrificial anode designed to protect boat hulls and rudders against galvanic corrosion. Manufactured from zinc, the anode measures 200 mm in length, 100 mm in width and 40 mm in height. It features two recessed mounting holes with a centre-to-centre bolt spacing of 110 mm for bolt-on installation. Product number 40ZHD, EAN 8720193084213. Supplied individually.
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$ 101.93
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1-2 weeks delivery time The MG Duff CM200Z Zinc European-Style Bolt-On Anode is designed to provide sacrificial corrosion protection for marine metal components in saltwater environments. Manufactured from zinc, it features an overall length of 140 mm, an anode body length of 96 mm, a width of 33 mm and a depth of 15 mm. The mounting arrangement includes two fixing holes with a diameter of 7 mm and an adjustable centre-to-centre spacing of 100–135 mm. The specified stud size is M6. Weighing 0.2 kg, this anode is designed for marine installations requiring a compact bolt-on zinc anode.
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$ 19.71
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1-2 weeks delivery time The MG Duff Stainless Steel 316 Stud Assemblies are designed for marine mounting applications and are available in two thread sizes: M10 (M10BSS) and M16 (M16BSS). Both models feature a stud length of 110 mm and are supplied complete with nuts and washers. Manufactured from corrosion-resistant 316 stainless steel, the M16BSS is additionally specified as A4 marine grade and suitable for wooden and polyester vessels. The assemblies are supplied individually, with EAN codes 5060333960391 for M10BSS and 5060333960438 for M16BSS.
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$ 35.25
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1-2 weeks delivery time The MgDuff Aluminium Round Hull and Rudder Anode is a dish-shaped sacrificial anode designed to protect boat hulls and rudder blades against corrosion in freshwater environments. Its streamlined profile is designed to minimise water resistance while providing sacrificial protection for underwater metal components. Available in four models: AD56 (Ø100 × 25 mm), AD58 (Ø150 × 35 mm), AD35 (Ø160 × 30 mm) and AD55 (Ø225 × 25 mm). Manufactured from aluminium, the anodes feature a central mounting opening and are supplied individually.
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$ 13.06
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1-2 weeks delivery time The MgDuff Magnesium Round Hull and Rudder Anode is a dish-shaped sacrificial anode designed to protect boat hulls and rudder blades against galvanic corrosion in freshwater environments. Its dish-shaped profile is designed to minimise water resistance during operation. Available in two models: MD56 (Ø100 × 25 mm, product number 1786) and MD58 (Ø150 × 35 mm, product number 1787). Manufactured from magnesium, both versions feature a central mounting opening and provide sacrificial corrosion protection for underwater metal components. Supplied individually.
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$ 35.14
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1-2 weeks delivery time The MgDuff Zinc Hull and Rudder Anode is a rectangular sacrificial anode designed to protect boat hulls and rudders against galvanic corrosion. Available in six models with body dimensions ranging from 200 × 65 × 32 mm to 457 × 102 × 64 mm. Mounting configurations include fixed hole spacings of 110, 200 and 225 mm, as well as adjustable spacing ranges of 100–210 mm and 200–229 mm, depending on the model. Manufactured from zinc, the anodes feature mounting holes or elongated slots for installation on the vessel. Each model is supplied individually.
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$ 269.48
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1-2 weeks delivery time The MgDuff Round Zinc Hull and Rudder Anode is a dish-shaped sacrificial anode designed to protect boat hulls and rudder blades against galvanic corrosion in saltwater environments. Its profile is designed to minimise water resistance, while the M10 mounting holes provide a defined installation arrangement. Available in four models: ZD56 (Ø100 × 25 mm), ZD58 (Ø150 × 35 mm), ZD35 (Ø160 × 30 mm) and ZD55 (Ø225 × 25 mm). Manufactured from zinc, these anodes provide sacrificial corrosion protection and are supplied individually.
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$ 25.76
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1-2 weeks delivery time The MgDuff Neoprene Anode Backing Plate is designed to prevent wear on the rear surface of hull and rudder anodes, helping to reduce the risk of the anode becoming loose. Available in seven models: B56, B58, B72B, B76EURO, B77, B77EURO and B78B, with lengths from 97 to 445 mm, widths from 65 to 127 mm and thicknesses of 5 or 6 mm. Each backing plate is designed for specific MgDuff anode models, including AD56/ZD56, AD58/ZD58, AD72B/ZD72B, AD76/ZD76, AD77 Euro/ZD77 Euro and AD78B/ZD78B. Select the appropriate backing plate according to the anode model and installation dimensions.
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$ 1.83
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1-2 weeks delivery time The MgDuff Magnesium Teardrop Anode is a sacrificial anode designed to protect boat hulls and rudders against galvanic corrosion. Available in two models: MD76 (114 × 76 × 32 mm) with a 160 mm mounting strip and 140 mm mounting hole spacing, and MD77 (157 × 83 × 41 mm) with a 230 mm mounting strip and 200 mm mounting hole spacing. Both models feature a teardrop-shaped magnesium body with an extended mounting strip. The MD76 is specified for saltwater applications, while the MD77 is described for freshwater and saltwater use. Each model is supplied individually.
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$ 25.75
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1-2 weeks delivery time The MgDuff Magnesium Weld-On Anode is a rectangular sacrificial anode designed to protect boat hulls and rudders against galvanic corrosion. Available in two models: MD79 (171 × 83 × 41 mm) with a 230 mm mounting strip and 200 mm mounting hole spacing, and MD78 (305 × 76 × 32 mm) with a 385 mm mounting strip. Both models feature a magnesium anode body with an extended mounting strip for installation on the vessel. Designed for marine corrosion protection and supplied individually.
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$ 78.99
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1-2 weeks delivery time The MG Duff AD57LKIT Aluminium Hanging Anode Kit is a complete sacrificial anode set designed for corrosion protection in saltwater and brackish water environments. The kit includes an aluminium alloy hanging anode and mounting components for installation. The anode measures 120 mm in length and 75 mm in width. Its hanging configuration allows flexible positioning for temporary or additional corrosion protection of electrically connected marine metal components. Product number AD57LKIT, EAN 5060333960964. Supplied as one complete kit.
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$ 115.61
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1-2 weeks delivery time The MG Duff MD57L Magnesium Hanging Anode is a sacrificial anode designed to provide corrosion protection for boats and marine metal components in freshwater environments. Manufactured from magnesium alloy, it features a hanging configuration for flexible positioning and a rounded, tapered body measuring 120 mm in length and 75 mm in width. The magnesium anode corrodes preferentially to help protect electrically connected metal components against galvanic corrosion. Product number MD57L, EAN 5060333961367. Supplied individually.
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$ 61.30
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1-2 weeks delivery time The MG Duff MD57LKIT Magnesium Hanging Anode Kit is a complete sacrificial anode set designed to provide corrosion protection for boats in freshwater environments. The kit includes a magnesium hanging anode and mounting components for installation. The anode measures 120 mm in length and 75 mm in width. Its hanging configuration allows flexible positioning for freshwater corrosion protection applications. Product number MD57LKIT, EAN 5060333961374. Supplied as one complete kit.
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$ 122.62
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1-2 weeks delivery time The MG Duff ZD57L Zinc Hanging Anode is designed to provide sacrificial corrosion protection for boats and marine metal components in saltwater environments. Manufactured from zinc, it features a teardrop-shaped body measuring 120 mm in length and 75 mm in width. The hanging configuration allows flexible positioning for corrosion protection applications. The zinc body corrodes preferentially to help protect electrically connected metal components against galvanic corrosion. Product number ZD57L, EAN 5060333961107. Supplied individually.
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$ 54.49
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1-2 weeks delivery time The MG Duff Stainless Steel 316 Stud Assemblies are designed for mounting sacrificial anodes on steel vessels. Available in M10C and M16C versions with M10 and M16 threaded studs respectively, both assemblies feature fully welded construction and an uncoated, paint-ready finish. Each assembly is supplied complete with nuts and washers. The M16C has a specified length of 40 mm. Manufactured from AISI 316 stainless steel for corrosion resistance in marine applications, these mounting assemblies are supplied individually.
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$ 15.43
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1-2 weeks delivery time The MME Rectangular Aluminium Hull and Rudder Anode is designed to provide sacrificial corrosion protection for steel-hulled boats. Available in three models: MME49AB (300 × 150 × 50 mm), MME100AB (300 × 200 × 70 mm) and MME110AB (300 × 200 × 75 mm). All variants are manufactured from aluminium and feature a specified anode strip length of 160 mm. The models share a body length of 300 mm but differ in width and height, allowing selection according to the required installation dimensions. Each anode is supplied individually.
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$ 124.01
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1-2 weeks delivery time The MME MME130ZB Zinc Hull and Rudder Anode is designed to provide sacrificial corrosion protection for marine hull and rudder components. Manufactured from zinc, it features a rectangular body measuring 300 × 150 × 50 mm with two recessed mounting holes. The specified anode strip length is 160 mm. Designed for marine applications, the anode helps protect metal components against corrosion. Product number MME130ZB, EAN 8720193041216. Supplied individually.
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$ 225.51
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1-2 weeks delivery time The MME Rectangular Zinc Hull and Rudder Anodes are designed to provide sacrificial corrosion protection for boat hulls and rudders in marine environments. The range includes eight models with zinc bodies measuring 305–457 mm in length, 68–102 mm in width and 38–64 mm in height. Available variants include MME24ZBS (315 × 70 × 40 mm) with a specified bolt spacing of 120–200 mm, MME30ZB (305 × 68 × 38 mm), MME33ZB (320 × 72 × 44 mm), MME40ZB (305 × 88 × 38 mm), MME70ZB (450 × 102 × 40 mm), MME120ZB and MME124ZB (457 × 102 × 64 mm), and MME134ZB (430 × 102 × 64 mm). The models differ in body dimensions and specified mounting parameters. Each anode is supplied individually.
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$ 208.11
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1-2 weeks delivery time The MME Neoprene Anode Backplates are designed to protect the rear surfaces of hull and rudder anodes against wear and help prevent loosening after installation. Manufactured from neoprene, the range includes 11 variants with round, rectangular and drop-shaped configurations for different MME anode models. Specified sizes include 100 × 100 mm, 160 × 160 mm, 230 × 230 mm, 300 × 150 mm, 450 × 102 mm and 305 × 88 mm. Each backplate is associated with specific anode models, making compatibility and dimensions important selection criteria. Supplied individually where specified.
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$ 10.58
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1-2 weeks delivery time The MME M10 Stainless Steel Stud Assembly is designed for mounting bolt-on sacrificial anodes in marine applications. Manufactured from stainless steel, the assembly features an M10 threaded stud with a circular mounting base measuring 30 mm in diameter and 5 mm in thickness. The overall assembly height is 36 mm. Suitable for securing bolt-on anodes where the specified M10 mounting arrangement is required.
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$ 24.22
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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.