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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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Martyr Streamlined Shaft Anodes - Imperial #: 23266 

From: $8.95 
Martyr Limited Clearance Shaft Anodes Zinc - Imperial #: 23275 

From: $12.70 
Anode Plastimo 38258 Collar Zinc 25 mm #: 32665 

Our Price: $13.45 
Martyr CM875821Z Volvo Penta Duo Prop 290 Series Saildrive Zinc Anode #: 32590 

Our Price: $33.95 
J PROP Hub Anode Type A or B - 63 and 83mm - Zinc #: 31737 

Our Price: $27.20 
Volvo Penta Folding Prop S-Drives CM3858399KITZ #: 31070 

Our Price: $25.45 
Martyr Divers Dream Plate Anode CMDIVER #: 32350 

From: $41.45 
Anode Flexofold Propellor - Zinc #: 33186 

Our Price: $31.45 
Anode Reliance Z-MD-N-1 Hull 8-5/8" x 3-3/16" x 1/2" #: 17336 

Our Price: $21.20 
Martyr MerCruiser Alpha I Generation II Aluminum Anode Kit ALPHAKITA #: 31970 

Our Price: $71.95 
Martyr MerCruiser Alpha I Generation II Magnesium Anode Kit ALPHAKITM #: 36973 

Our Price: $105.95 
Martyr MerCruiser Bravo 1 Anode Kit Zinc CMBRAVO1KITZ #: 31974 

Our Price: $59.45 
Martyr MerCruiser Bravo II and III Anode Kits CMBRAVO23KIT #: 31976 

From: $53.45 
Martyr MerCruiser Bravo III Anode Kits CMBRAVO3KIT #: 14512 

From: $54.95 
Zinc Anode M25 Bolt Hull Oval 9 1/4 x 3 3/8 in. #: 33100 

Our Price: $25.45 
Martyr CM31640Z Anode Mercury Trim Tab #: 30080 

Our Price: $16.95 
Anode Reliance ZTS Zinc Teardrop Steel Tabs 5 Lb 9 x 3 x 1-3/8"n. #: 32248 

Our Price: $37.20 
Yanmar Sail Drive Zinc Anode CM19642002652Z #: 45086 

Our Price: $38.20 
Yanmar Saildrive 2 Piece Split Ring Zinc Anode CM19644002660KITZ #: 45093 

Our Price: $76.45 
Martyr CMZHC2Z Hull Anode 5.75 x 2.65 in. #: 32582 

Our Price: $33.95 
Martyr Volvo 120 Series Zinc Collar Ring Anode CM851983 #: 23326 

Our Price: $21.20 
Martyr V-18 Volvo Penta 280 & 290 Ring Zinc Anode #: 32581 

Our Price: $18.70 
Martyr Volvo Transom Zinc Anode CM832598Z #: 23274 

Our Price: $25.45 
Anode Beneteau Propeller Nut Anode 22/25mm - Complete #: 32017 

Our Price: $67.95 
Anode Beneteau Propeller Nut Anode 22/25mm Zinc Only CMAN225 #: 32052 

Our Price: $16.95 
Anode Beneteau Propeller Nut Anode 30mm - Complete #: 32053 

Our Price: $67.95 
Anode Beneteau Propeller Nut Anode 30mm - Zinc Only #: 32056 

Our Price: $22.95 
Martyr Max Prop Anode MP63RZ #: 23991 

Our Price: $10.95 
Martyr Max Prop Anode MP70RZ #: 23325 

Our Price: $15.20 
Martyr Max Prop Anode MP83RZ #: 23626 

Our Price: $28.70 
Martyr Rudder and Trim Tab Anodes #: 23280 

From: $7.45 
Martyr Teardrop Small Zinc Anode 3 1/2 in. #: 23284 

Our Price: $7.45 
Martyr Teardrop Zinc Anode 5 1/4 in. #: 23285 

Our Price: $10.95 
Propeller Nut Anodes Complete including Insert and Hardware - Zinc #: 20110 

From: $29.70 
Replacement Zinc Propeller Nut Anodes Type A to Type D #: 32719 

From: $9.20 
Anode CMMZC406 Hull Anode 9" x 4.4" x 1" #: 32585 

Our Price: $76.45 
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