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FIT THE CORRECT ANODE MATERIAL FOR THE WATERS YOUR VESSEL IS OPERATING IN

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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    Product Name   Model   Price 
 Anode Plastimo 38258 Collar Zinc 25 mm  Anode Plastimo 38258 Collar Zinc 25 mm Free Shipping  Binnacle.com #: 32665  Our Price: $11.95 
 Martyr Bravo III Anode Kit 2004 to Present Zinc CMBRAVO3KITZ  Martyr Bravo III Anode Kit 2004 to Present Zinc CMBRAVO3KITZ Free Shipping  Binnacle.com #: 31824  Our Price: $51.95 
 Volvo Penta Duo Prop 290 Series Saildrive Zinc Anode 875821Z  Volvo Penta Duo Prop 290 Series Saildrive Zinc Anode 875821Z Free Shipping  Binnacle.com #: 32590  Our Price: $31.95 
 J PROP Hub Anode Type A or B - 63 and 83mm - Zinc  J PROP Hub Anode Type A or B - 63 and 83mm - Zinc Free Shipping  Binnacle.com #: 31737  Our Price: $25.45 
 Volvo Penta Folding Prop S-Drives CM3858399KITZ  Volvo Penta Folding Prop S-Drives CM3858399KITZ Free Shipping  Binnacle.com #: 31070  Our Price: $18.20 
 Anode C6 Donut Shaft 1-3/8 in.  Anode C6 Donut Shaft 1-3/8 in. Free Shipping  Binnacle.com #: 23301  Our Price: $17.45 
 Anode C8 Donut Shaft 1-3/4 in.  Anode C8 Donut Shaft 1-3/4 in. Free Shipping  Binnacle.com #: 23287  Our Price: $23.95 
 Anode Flexofold Propellor - Zinc  Anode Flexofold Propellor - Zinc Free Shipping  Binnacle.com #: 33186  Our Price: $26.20 
 Anode Hull 8 1/2 x 3 1/8 in Reliance Z4T  Anode Hull 8 1/2 x 3 1/8 in Reliance Z4T Free Shipping  Binnacle.com #: 17336  Our Price: $18.20 
 Martyr Anode Kit MerCruiser Alpha I Generation II Aluminum Kit ALPHAKITA  Martyr Anode Kit MerCruiser Alpha I Generation II Aluminum Kit ALPHAKITA Free Shipping  Binnacle.com #: 31970  Our Price: $59.95 
 Martyr Anode Kit MerCruiser Alpha I Generation II Magnesium Kit ALPHAKITM  Martyr Anode Kit MerCruiser Alpha I Generation II Magnesium Kit ALPHAKITM Free Shipping  Binnacle.com #: 36973  Our Price: $89.95 
 Martyr Bravo 1 Anode Kit Zinc CMBRAVO1KITZ  Martyr Bravo 1 Anode Kit Zinc CMBRAVO1KITZ Free Shipping  Binnacle.com #: 31974  Our Price: $52.45 
 Martyr Bravo II and III Anode Kits CMBRAVO23KIT  Martyr Bravo II and III Anode Kits CMBRAVO23KIT Free Shipping  Binnacle.com #: 31976  Our Price: $47.20 
 Martyr Anode Kit Bravo III Aluminum CMBRAVO3KITA  Martyr Anode Kit Bravo III Aluminum CMBRAVO3KITA Free Shipping  Binnacle.com #: 31989  Our Price: $48.70 
 Zinc Anode M25 Bolt Hull Oval 9 1/4 x 3 3/8 in.  Zinc Anode M25 Bolt Hull Oval 9 1/4 x 3 3/8 in. Free Shipping  Binnacle.com #: 33100  Our Price: $23.95 
 Anode Mercury Trim Tab 31640Z  Anode Mercury Trim Tab 31640Z Free Shipping  Binnacle.com #: 30080  Our Price: $15.95 
 Anode Reliance ZTS Zinc Teardrop Steel Tabs 5 Lb 9 x 3 x 1-3/8"n.  Anode Reliance ZTS Zinc Teardrop Steel Tabs 5 Lb 9 x 3 x 1-3/8"n. Free Shipping  Binnacle.com #: 32248  Our Price: $29.45 
 Yanmar Sail Drive Zinc Anode CM19642002652Z  Yanmar Sail Drive Zinc Anode CM19642002652Z Free Shipping  Binnacle.com #: 45086  Our Price: $35.95 
 Yanmar Saildrive 2 Piece Split Ring Zinc Anode CM19644002660KITZ  Yanmar Saildrive 2 Piece Split Ring Zinc Anode CM19644002660KITZ Free Shipping  Binnacle.com #: 45093  Our Price: $67.45 
 Martyr CMZHC2Z Hull Anode 5.75 x 2.65 in.  Martyr CMZHC2Z Hull Anode 5.75 x 2.65 in. Free Shipping  Binnacle.com #: 32582  Our Price: $29.45 
 Martyr Volvo 120 Series Zinc Collar Ring Anode CM851983  Martyr Volvo 120 Series Zinc Collar Ring Anode CM851983 Free Shipping  Binnacle.com #: 23326  Our Price: $19.95 
 Martyr V-18 Volvo Penta 280 & 290 Ring Zinc Anode  Martyr V-18 Volvo Penta 280 & 290 Ring Zinc Anode Free Shipping  Binnacle.com #: 32581  Our Price: $17.45 
 Martyr Volvo Transom Anode 832598  Martyr Volvo Transom Anode 832598 Free Shipping  Binnacle.com #: 23274  Our Price: $23.95 
 Anode Beneteau Propeller Nut Anode 22/25mm - Complete  Anode Beneteau Propeller Nut Anode 22/25mm - Complete Free Shipping  Binnacle.com #: 32017  Our Price: $59.95 
 Anode Beneteau Propeller Nut Anode 22/25mm Zinc Only CMAN225  Anode Beneteau Propeller Nut Anode 22/25mm Zinc Only CMAN225 Free Shipping  Binnacle.com #: 32052  Our Price: $15.95 
 Anode Beneteau Propeller Nut Anode 30mm - Complete  Anode Beneteau Propeller Nut Anode 30mm - Complete Free Shipping  Binnacle.com #: 32053  Our Price: $59.95 
 Anode Beneteau Propeller Nut Anode 30mm - Zinc Only  Anode Beneteau Propeller Nut Anode 30mm - Zinc Only Free Shipping  Binnacle.com #: 32056  Our Price: $21.45 
 Martyr Max Prop Anode 63RZ  Martyr Max Prop Anode 63RZ Free Shipping  Binnacle.com #: 23991  Our Price: $10.20 
 Martyr Max Prop Anode 70RZ  Martyr Max Prop Anode 70RZ Free Shipping  Binnacle.com #: 23325  Our Price: $12.70 
 Martyr Max Prop Anode 83RZ  Martyr Max Prop Anode 83RZ Free Shipping  Binnacle.com #: 23626  Our Price: $26.20 
 Martyr Anode Donut Shaft 3/4  Martyr Anode Donut Shaft 3/4 Free Shipping  Binnacle.com #: 23275  Our Price: $11.20 
 Martyr Anode Donut Shaft 7/8  Martyr Anode Donut Shaft 7/8 Free Shipping  Binnacle.com #: 23276  Our Price: $11.95 
 Martyr Anode Donut Shaft 1 in.  Martyr Anode Donut Shaft 1 in. Free Shipping  Binnacle.com #: 23277  Our Price: $13.45 
 Martyr Anode Donut Shaft 1-1/8  Martyr Anode Donut Shaft 1-1/8 Free Shipping  Binnacle.com #: 23278  Our Price: $14.20 
 Martyr Anode Donut Shaft 1-1/4"  Martyr Anode Donut Shaft 1-1/4" Free Shipping  Binnacle.com #: 23279  Our Price: $15.20 
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