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Please note: Standard deliveries are currently taking up to 2 working days, however pallet deliveries to Scotland only are currently taking 2-3 working days at a minimum. We are working with our logistics partners to return to normal service.

Magnesium Hull Anodes


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We offer a range of Magnesium MG Duff sacrificial hull anodes that are available in pear, disc, straight and hanging variants.

Important note

All schemes must be inspected annually and the sacrificial anodes should be renewed if they are more than 50% are wasted. You should check the working surface of the sacrificial anode to ensure that it is free of paint and chalky corrosion deposits. When fitting or replacing a sacrificial anode you should also replace the serrated fan disc washers under the nuts and change the anode backing sheet on wood and GRP hulls. Exposed fixing studs, nuts and washers should be well greased or painted after assembly.

Wooden hulled vessels operating in fresh water are subject to the same corrosion problems as GRP craft. However the fitting of magnesium anodes is NOT recommended as they will have a damaging effect on the timbers around the fixings known as electro-chemical decay. MG Duff advise that the appropriate action is to fit a magnesium shaft collar on the exposed propeller shaft and if necessary to fit anodes directly to mild steel rudders and keels.

Aluminium Alloy hull anodes are suitable for use in salt and brackish / estuarine waters.

Magnesium hull anodes are suitable for use in fresh waters.

Zinc hull anodes are suitable for use in salt waters.

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