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Zincs & Anodes

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 
 Martyr Streamlined Barrel Shaft Anodes - Imperial  Martyr Streamlined Barrel Shaft Anodes - Imperial Free Shipping  Binnacle.com #: 23266  Our Price: $14.45 
 Martyr Streamlined Shaft Anodes Zinc - Metric  Martyr Streamlined Shaft Anodes Zinc - Metric Free Shipping  Binnacle.com #: 21139  Our Price: $47.95 
 Martyr Limited Clearance Shaft Anodes Zinc - Imperial  Martyr Limited Clearance Shaft Anodes Zinc - Imperial Free Shipping  Binnacle.com #: 23275  Our Price: $14.45 
 Anode Plastimo 38258 Collar Zinc 25 mm  Anode Plastimo 38258 Collar Zinc 25 mm Free Shipping  Binnacle.com #: 32665  Our Price: $16.95 
 Martyr Yamaha Handlebar Anodes  Martyr Yamaha Handlebar Anodes Free Shipping  Binnacle.com #: 27239  Our Price: $18.70 
 Martyr CM875821Z Volvo Penta Duo Prop 290 Series Saildrive Zinc Anode  Martyr CM875821Z Volvo Penta Duo Prop 290 Series Saildrive Zinc Anode Free Shipping  Binnacle.com #: 32590  Our Price: $33.95 
 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: $33.95 
 Volvo Penta Folding Prop S-Drives CM3858399KITZ  Volvo Penta Folding Prop S-Drives CM3858399KITZ Free Shipping  Binnacle.com #: 31070  Our Price: $29.70 
 Martyr Divers Dream Plate Anode CMDIVER  Martyr Divers Dream Plate Anode CMDIVER Free Shipping  Binnacle.com #: 32350  Our Price: $65.45 
 Anode Flexofold Propellor - Zinc  Anode Flexofold Propellor - Zinc Free Shipping  Binnacle.com #: 33186  Our Price: $35.20 
 Anode Reliance Z-MD-N-1 Hull 8-5/8" x 3-3/16" x 1/2"  Anode Reliance Z-MD-N-1 Hull 8-5/8" x 3-3/16" x 1/2" Free Shipping  Binnacle.com #: 17336  Our Price: $31.95 
 Martyr MerCruiser Alpha I Generation II Aluminum Anode Kit ALPHAKITA  Martyr MerCruiser Alpha I Generation II Aluminum Anode Kit ALPHAKITA Free Shipping  Binnacle.com #: 31970  Our Price: $76.45 
 Martyr MerCruiser Alpha I Generation II Magnesium Anode Kit ALPHAKITM  Martyr MerCruiser Alpha I Generation II Magnesium Anode Kit ALPHAKITM Free Shipping  Binnacle.com #: 36973  Our Price: $118.95 
 Martyr MerCruiser Bravo 1 Anode Kit Zinc CMBRAVO1KITZ  Martyr MerCruiser Bravo 1 Anode Kit Zinc CMBRAVO1KITZ Free Shipping  Binnacle.com #: 31974  Our Price: $59.45 
 Martyr MerCruiser Bravo II and III Anode Kits CMBRAVO23KIT  Martyr MerCruiser Bravo II and III Anode Kits CMBRAVO23KIT Free Shipping  Binnacle.com #: 31976  Our Price: $59.45 
 Martyr MerCruiser Bravo III Anode Kits CMBRAVO3KIT  Martyr MerCruiser Bravo III Anode Kits CMBRAVO3KIT Free Shipping  Binnacle.com #: 14512  Our Price: $119.95 
 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: $29.70 
 Martyr CM31640Z Anode Mercury Trim Tab  Martyr CM31640Z Anode Mercury Trim Tab Free Shipping  Binnacle.com #: 30080  Our Price: $16.95 
 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: $47.95 
 Yanmar Sail Drive Zinc Anode CM19642002652Z  Yanmar Sail Drive Zinc Anode CM19642002652Z Free Shipping  Binnacle.com #: 45086  Our Price: $43.95 
 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: $95.95 
 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: $41.45 
 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: $24.45 
 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: $25.45 
 Martyr Volvo Transom Zinc Anode CM832598Z  Martyr Volvo Transom Zinc Anode CM832598Z Free Shipping  Binnacle.com #: 23274  Our Price: $25.45 
 Anode Beneteau Propeller Nut Anode 22/25mm - Complete  Anode Beneteau Propeller Nut Anode 22/25mm - Complete Free Shipping  Binnacle.com #: 32017  Our Price: $80.45 
 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: $21.20 
 Anode Beneteau Propeller Nut Anode 30mm - Complete  Anode Beneteau Propeller Nut Anode 30mm - Complete Free Shipping  Binnacle.com #: 32053  Our Price: $91.95 
 Anode Beneteau Propeller Nut Anode 30mm - Zinc Only  Anode Beneteau Propeller Nut Anode 30mm - Zinc Only Free Shipping  Binnacle.com #: 32056  Our Price: $27.95 
 Martyr Max Prop Anode MP63RZ  Martyr Max Prop Anode MP63RZ Free Shipping  Binnacle.com #: 23991  Our Price: $14.45 
 Martyr Max Prop Anode MP70RZ  Martyr Max Prop Anode MP70RZ Free Shipping  Binnacle.com #: 23325  Our Price: $19.45 
 Martyr Max Prop Anode MP83RZ  Martyr Max Prop Anode MP83RZ Free Shipping  Binnacle.com #: 23626  Our Price: $32.95 
 Martyr Rudder and Trim Tab Anodes  Martyr Rudder and Trim Tab Anodes Free Shipping  Binnacle.com #: 23280  Our Price: $8.45 
 Martyr Teardrop Small Zinc Anode 3 1/2 in.  Martyr Teardrop Small Zinc Anode 3 1/2 in. Free Shipping  Binnacle.com #: 23284  Our Price: $10.20 
 Martyr Teardrop Zinc Anode 5 1/4 in.  Martyr Teardrop Zinc Anode 5 1/4 in. Free Shipping  Binnacle.com #: 23285  Our Price: $13.45 
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