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Martyr Marine Anodes



Zincs & Anodes


As a general rule owners should fit the anodes suitable for the environment they most regularly berth in and the following table provides a useful guide: 
  • Salt Water: Zinc (MartyrTM I) or Aluminum Anodes
  • Brackish Water: Aluminum Anodes (MartyrTM II)
  • Fresh Water: Magnesium Anode (MartyrTM III) 
Note: Never Mix Zinc and Aluminum Anodes on the same vessel.
Some vessels will from time to time move between salt and fresh water, others are berthed within marinas and behind tidal barriers where the water is enclosed and likely to be brackish or even virtually fresh. Owners must be aware of the effects that this may have on their boats and fit the correct cathodic protection system to avoid corrosion. Not all anodes are suitable for every environment, for example the surface of a zinc or aluminum anode will if left in fresh water for some time become covered with an off white crust of oxide which effectively seals the anode and stops it working even when returned to salt water.

Zinc Anodes suffer a similar problem even in brackish conditions whereas Aluminum will continue to operate effectively in river estuaries and other areas of brackish water indefinitely. The consequences of this passivity of the anode are that the next most anodic item within the anode bonding system will start to sacrifice itself which could of course be very serious. It is therefore very important to check Zinc and Aluminum anodes after any trips into fresh water and if necessary clean off or change the anodes. Should a vessel move into fresh water for more than two weeks MartyrTM recommends that an alternative anode system is used suitable for fresh water situations.
Magnesium Anodes on the other hand have a much higher driving voltage than zinc or aluminum making them highly suitable for use in fresh water, they will however become very active in salt water where they will probably only last a matter of months. Protected surfaces can build up a layer of off-white calcareous deposit which will be difficult to remove. Magnesium anodes are not designed for prolonged use in sea water and if you are taking your boat into a salt water location for more than seven days (Fourteen days in any one year) you should consider changing the anodes.

Reprinted courtesy of MG Duff International and Martyr Anodes - CMP
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Anode C6 Donut Shaft 1-3/8 in. #: 23301 

Our Price: $20.95 
Anode C8 Donut Shaft 1-3/4 in. #: 23287 

Our Price: $24.95 
Anode Flex-O-Fold Propellor Nut Anode - Zinc #: 33186 

Our Price: $32.95 
Anode Hull 8 1/2 x 3 1/8 in Reliance N-1 #: 17336 

Our Price: $22.95 
Anode Kit MerCruiser Alpha I Generation II Aluminum Kit ALPHAKITA #: 31970 

Our Price: $65.45 
Anode M25 Bolt Hull Oval 9 1/4 x 3 3/8 in. #: 33100 

Our Price: $24.95 
Anode Mercury Trim Tab 31640Z #: 30080 

Our Price: $19.95 
Anode Teardrop - Steel Tabs 5 Lb 8 x 3 in. #: 32248 

Our Price: $29.95 
Anode Volvo Saildrive Ring 875812 #: 10311 

Our Price: $32.95 
Yanmar Sail Drive Zinc Anode CM19642002652Z #: 45086 

Our Price: $39.95 
Yanmar Saildrive 2 Piece Split Ring Zinc Anode CM19644002660KITZ #: 45093 

Our Price: $65.45 
Martyr Anode Kit Bravo I 1988 to Present Zinc CMBRAVO1KITZ #: 31974 

Our Price: $41.45 
Martyr Anode Kit Bravo II and III Aluminum CMBRAVO23KITA #: 31976 

Our Price: $43.95 
Martyr Anode Kit Bravo II and III Magnesium CMBRAVO23KITM #: 42078 

Our Price: $77.45 
Martyr Anode Kit Bravo III Aluminum CMBRAVO3KITA #: 31989 

Our Price: $43.95 
Martyr Streamlined Hull Anode 5.75 x 2.5in. ZHC-2 #: 32582 

Our Price: $27.95 
Martyr Volvo Prop Ring Anode 851983 #: 23326 

Our Price: $19.95 
Martyr Volvo Prop Ring Anode V18 #: 32581 

Our Price: $21.95 
Martyr Volvo Transom Anode 832598 #: 23274 

Our Price: $29.95 
Anode Beneteau Propeller Nut Anode 22/25mm - Complete #: 32017 

Our Price: $47.95 
Anode Beneteau Propeller Nut Anode 22/25mm - Zinc Only #: 32052 

Our Price: $17.95 
Anode Beneteau Propeller Nut Anode 30mm - Complete #: 32053 

Our Price: $62.95 
Anode Beneteau Propeller Nut Anode 30mm - Zinc Only #: 32056 

Our Price: $26.95 
Anode Max Prop Anode 63R #: 23991 

Our Price: $9.95 
Anode Max Prop Anode 70R #: 23325 

Our Price: $15.95 
Anode Max Prop Anode 83R #: 23626 

Our Price: $29.95 
Martyr Anode Donut Shaft 3/4 #: 23275 

Our Price: $13.95 
Martyr Anode Donut Shaft 7/8 #: 23276 

Our Price: $12.50 
Martyr Anode Donut Shaft 1 in. #: 23277 

Our Price: $14.95 
Martyr Anode Donut Shaft 1-1/8 #: 23278 

Our Price: $16.95 
Martyr Anode Donut Shaft 1-1/4 #: 23279 

Our Price: $14.95 
Martyr Anode Donut Shaft 1-1/2 #: 23290 

Our Price: $20.95 
Anode C9 Donut Shaft 2 in. #: 38577 

Our Price: $28.95 
Martyr Zinc Barrel Anode 3/4 Inch Shaft #: 23266 

Our Price: $13.95 
Martyr Zinc Barrel Anode 7/8 Inch Shaft #: 23267 

Our Price: $12.95 
Martyr Zinc Barrel Anode 1 Inch Shaft #: 23268 

Our Price: $12.95 
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