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Anodes

Metal parts on boats are subject to two types of corrosion. Galvanic corrosion is a chemical reaction which
Any water which is not perfectly pure can act as a conductor. The more mineral content in the water, the more conductive it is. Conductivity also rises with water temperature, which is why metal parts on boats in Florida corrode faster than those in Alaska.

Anodes are made from a metal alloy with a more "active" voltage (more negative reduction potential / more positive electrochemical potential) than the metal they are attached to. The difference in potential between the two metals means that the galvanic anode corrodes, so that the anode material is consumed in preference to the structure. The loss (or sacrifice) of the anode material gives rise to the alternative name of sacrificial anode. (Read More)
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Tecnoseal X22 Shaft Anode - Zinc - 6-1/2" Shaft Diameter Tecnoseal X21 Shaft Anode - Zinc - 6" Shaft Diameter Tecnoseal X20 Shaft Anode - Zinc - 5-1/2" Shaft Diameter
Tecnoseal X22 Shaft Anode - Zinc - 6-1/2" Shaft Diameter
List Price: $159.99
Sale Price: $92.75
You Save: $67.24
Tecnoseal X21 Shaft Anode - Zinc - 6" Shaft Diameter
List Price: $139.99
Sale Price: $68.83
You Save: $71.16
Tecnoseal X20 Shaft Anode - Zinc - 5-1/2" Shaft Diameter
List Price: $134.99
Sale Price: $68.58
You Save: $66.41
Tecnoseal X19 Shaft Anode - Zinc - 5" Shaft Diameter Tecnoseal Anode Kit w/Hardware - Volvo IPS - Zinc/Aluminum Tecnoseal X18 Shaft Anode - Zinc - 4-1/2" Shaft Diameter
Tecnoseal X19 Shaft Anode - Zinc - 5" Shaft Diameter
List Price: $129.99
Sale Price: $67.13
You Save: $62.86
Tecnoseal Anode Kit w/Hardware - Volvo IPS - Zinc/Aluminum
List Price: $79.99
Sale Price: $61.95
You Save: $18.04
Tecnoseal X18 Shaft Anode - Zinc - 4-1/2" Shaft Diameter
List Price: $84.99
Sale Price: $57.10
You Save: $27.89
Tecnoseal X14 Shaft Anode - Zinc - 3-1/4" Shaft Diameter Tecnoseal X17 Shaft Anode - Zinc - 4" Shaft Diameter Tecnoseal X16 Shaft Anode - Zinc - 3-3/4" Shaft Diameter
Tecnoseal X14 Shaft Anode - Zinc - 3-1/4" Shaft Diameter
List Price: $84.99
Sale Price: $55.54
You Save: $29.45
Tecnoseal X17 Shaft Anode - Zinc - 4" Shaft Diameter
List Price: $84.99
Sale Price: $53.66
You Save: $31.33
Tecnoseal X16 Shaft Anode - Zinc - 3-3/4" Shaft Diameter
List Price: $85.99
Sale Price: $53.25
You Save: $32.74
Tecnoseal X15 Shaft Anode - Zinc - 3-1/2" Shaft Diameter Tecnoseal Z406 Hull Plate Anode - Zinc Tecnoseal Anode Kit w/Hardware - Mercury Bravo 3 2004 - Zinc
Tecnoseal X15 Shaft Anode - Zinc - 3-1/2" Shaft Diameter
List Price: $89.99
Sale Price: $51.70
You Save: $38.29
Tecnoseal Z406 Hull Plate Anode - Zinc
List Price: $59.99
Sale Price: $46.99
You Save: $13.00
Tecnoseal Anode Kit w/Hardware - Mercury Bravo 3 2004 - Zinc
List Price: $62.99
Sale Price: $43.39
You Save: $19.60
Tecnoseal Anode Kit w/Hardware - Mercury Bravo 3 2004 - Aluminum Tecnoseal R5MG Rudder Anode - Magnesium - 5" Diameter VETUS Zinc Anode Set f/Bow Thrusters - 75/80/95 kgf Bow Thrusters
Tecnoseal Anode Kit w/Hardware - Mercury Bravo 3 2004 - Aluminum
List Price: $52.99
Sale Price: $42.90
You Save: $10.09
Tecnoseal R5MG Rudder Anode - Magnesium - 5" Diameter
List Price: $79.99
Sale Price: $42.08
You Save: $37.91
VETUS Zinc Anode Set f/Bow Thrusters - 75/80/95 kgf Bow Thrusters
List Price: $56.00
Sale Price: $42.00
You Save: $14.00
Tecnoseal TEC-DIVERSMG Plate Anode - Magnesium Tecnoseal Anode Kit w/Hardware - Mercury Bravo 3 2004 - Magnesium Tecnoseal R7 Rudder Anode - Zinc - 6-1/2" Diameter
Tecnoseal TEC-DIVERSMG Plate Anode - Magnesium
List Price: $62.99
Sale Price: $41.75
You Save: $21.24
Tecnoseal Anode Kit w/Hardware - Mercury Bravo 3 2004 - Magnesium
List Price: $69.99
Sale Price: $41.64
You Save: $28.35
Tecnoseal R7 Rudder Anode - Zinc - 6-1/2" Diameter
List Price: $59.99
Sale Price: $41.51
You Save: $18.48
Tecnoseal TEC-DIVERS Plate Anode - Zinc Tecnoseal Grouper Suspended Anode w/Cable & Clamp - Zinc Tecnoseal Anode Kit w/Hardware - Mercury Alpha 1 Gen 2 - Magnesium
Tecnoseal TEC-DIVERS Plate Anode - Zinc
List Price: $49.99
Sale Price: $40.04
You Save: $9.95
Tecnoseal Grouper Suspended Anode w/Cable & Clamp - Zinc
List Price: $48.99
Sale Price: $39.58
You Save: $9.41
Tecnoseal Anode Kit w/Hardware - Mercury Alpha 1 Gen 2 - Magnesium
List Price: $64.99
Sale Price: $39.38
You Save: $25.61
Tecnoseal X12 Shaft Anode - Zinc - 2-3/4" Shaft Diameter VETUS Zinc Anode Set f/Bow Thrusters - 35/55 kgf Bow Thrusters Tecnoseal Anode Kit w/Hardware - Mercury Alpha 1 Gen 2 - Zinc
Tecnoseal X12 Shaft Anode - Zinc - 2-3/4" Shaft Diameter
List Price: $66.99
Sale Price: $38.94
You Save: $28.05
VETUS Zinc Anode Set f/Bow Thrusters - 35/55 kgf Bow Thrusters
List Price: $51.75
Sale Price: $38.81
You Save: $12.94
Tecnoseal Anode Kit w/Hardware - Mercury Alpha 1 Gen 2 - Zinc
List Price: $59.99
Sale Price: $38.70
You Save: $21.29
Tecnoseal Anode Kit w/Hardware - Mercury Alpha 1 Gen 2 - Aluminum Tecnoseal Anode Kit w/Hardware - Volvo SX - Magnesium Tecnoseal Anode Kit w/Hardware - Mercury Bravo 1 - Magnesium
Tecnoseal Anode Kit w/Hardware - Mercury Alpha 1 Gen 2 - Aluminum
List Price: $55.99
Sale Price: $37.06
You Save: $18.93
Tecnoseal Anode Kit w/Hardware - Volvo SX - Magnesium
List Price: $55.99
Sale Price: $36.24
You Save: $19.75
Tecnoseal Anode Kit w/Hardware - Mercury Bravo 1 - Magnesium
List Price: $59.99
Sale Price: $35.86
You Save: $24.13
VETUS Zinc Anode Set f/Bow Thrusters - 25 kgf Bow Thrusters Tecnoseal Anode Kit w/Hardware - Mercury Verado 6 - Zinc Tecnoseal X13 Shaft Anode - Zinc - 3" Shaft Diameter
VETUS Zinc Anode Set f/Bow Thrusters - 25 kgf Bow Thrusters
List Price: $47.50
Sale Price: $35.61
You Save: $11.89
Tecnoseal Anode Kit w/Hardware - Mercury Verado 6 - Zinc
List Price: $49.99
Sale Price: $35.54
You Save: $14.45
Tecnoseal X13 Shaft Anode - Zinc - 3" Shaft Diameter
List Price: $66.99
Sale Price: $35.40
You Save: $31.59
Tecnoseal R4MG Rudder Anode - Magnesium - 5" Diameter Tecnoseal Anode Kit w/Hardware - Mercury Bravo 1 - Aluminum Tecnoseal X13AL Shaft Anode - Aluminum - 3" Shaft Diameter
Tecnoseal R4MG Rudder Anode - Magnesium - 5" Diameter
List Price: $69.99
Sale Price: $34.30
You Save: $35.69
Tecnoseal Anode Kit w/Hardware - Mercury Bravo 1 - Aluminum
List Price: $52.99
Sale Price: $33.81
You Save: $19.18
Tecnoseal X13AL Shaft Anode - Aluminum - 3" Shaft Diameter
List Price: $69.99
Sale Price: $33.45
You Save: $36.54
Tecnoseal Anode Kit w/Hardware - Mercury Bravo 2-3 - Aluminum Tecnoseal Anode Kit w/Hardware - Mercury Bravo 2-3 - Magnesium Tecnoseal X12AL Shaft Anode - Aluminum - 2-3/4" Shaft Diameter
Tecnoseal Anode Kit w/Hardware - Mercury Bravo 2-3 - Aluminum
List Price: $44.99
Sale Price: $31.80
You Save: $13.19
Tecnoseal Anode Kit w/Hardware - Mercury Bravo 2-3 - Magnesium
List Price: $49.99
Sale Price: $31.18
You Save: $18.81
Tecnoseal X12AL Shaft Anode - Aluminum - 2-3/4" Shaft Diameter
List Price: $64.99
Sale Price: $30.79
You Save: $34.20
Tecnoseal X11 Shaft Anode - Zinc - 2-1/2" Shaft Diameter Tecnoseal Anode Kit w/Hardware - Mercury Bravo 1 - Zinc Tecnoseal X10 Shaft Anode - Zinc - 2-1/4" Shaft Diameter
Tecnoseal X11 Shaft Anode - Zinc - 2-1/2" Shaft Diameter
List Price: $52.99
Sale Price: $29.91
You Save: $23.08
Tecnoseal Anode Kit w/Hardware - Mercury Bravo 1 - Zinc
List Price: $49.99
Sale Price: $29.83
You Save: $20.16
Tecnoseal X10 Shaft Anode - Zinc - 2-1/4" Shaft Diameter
List Price: $49.99
Sale Price: $29.75
You Save: $20.24
Tecnoseal Anode Kit w/Hardware - Mercury Verado 6 - Magnesium Tecnoseal Anode Kit w/Hardware - Mercury Alpha 1 Gen 1 - Zinc Tecnoseal X11AL Shaft Anode - Aluminum - 2-1/2" Shaft Diameter
Tecnoseal Anode Kit w/Hardware - Mercury Verado 6 - Magnesium
List Price: $49.99
Sale Price: $29.26
You Save: $20.73
Tecnoseal Anode Kit w/Hardware - Mercury Alpha 1 Gen 1 - Zinc
List Price: $49.99
Sale Price: $29.19
You Save: $20.80
Tecnoseal X11AL Shaft Anode - Aluminum - 2-1/2" Shaft Diameter
List Price: $52.99
Sale Price: $28.44
You Save: $24.55
Tecnoseal Anode Kit w/Hardware - Mercury Verado 4 - Magnesium Tecnoseal Anode Kit - Volvo DPSA/SXA - Zinc Tecnoseal X10AL Shaft Anode - Aluminum - 2-1/4" Shaft Diameter
Tecnoseal Anode Kit w/Hardware - Mercury Verado 4 - Magnesium
List Price: $42.99
Sale Price: $27.99
You Save: $15.00
Tecnoseal Anode Kit - Volvo DPSA/SXA - Zinc
List Price: $52.99
Sale Price: $27.85
You Save: $25.14
Tecnoseal X10AL Shaft Anode - Aluminum - 2-1/4" Shaft Diameter
List Price: $49.99
Sale Price: $27.71
You Save: $22.28
Tecnoseal Anode Kit w/Hardware - Volvo SX - Zinc Tecnoseal Anode Kit w3/Hardware - Yamaha 150-200HP Left Hand Rotation - Zinc Tecnoseal Anode Kit w/Hardware - Mercury Alpha 1 Gen 1 - Magnesium
Tecnoseal Anode Kit w/Hardware - Volvo SX - Zinc
List Price: $49.99
Sale Price: $27.06
You Save: $22.93
Tecnoseal Anode Kit w3/Hardware - Yamaha 150-200HP Left Hand Rotation - Zinc
List Price: $34.99
Sale Price: $26.98
You Save: $8.01
Tecnoseal Anode Kit w/Hardware - Mercury Alpha 1 Gen 1 - Magnesium
List Price: $52.99
Sale Price: $26.31
You Save: $26.68
Tecnoseal Anode Kit w/Hardware - Mercury Alpha 1 Gen 1 - Aluminum Tecnoseal Anode Kit w/Hardware - Mercury Verado 4 - Aluminum Tecnoseal Anode Kit w/Hardware - Volvo SX - Aluminum
Tecnoseal Anode Kit w/Hardware - Mercury Alpha 1 Gen 1 - Aluminum
List Price: $49.99
Sale Price: $26.14
You Save: $23.85
Tecnoseal Anode Kit w/Hardware - Mercury Verado 4 - Aluminum
List Price: $39.99
Sale Price: $25.49
You Save: $14.50
Tecnoseal Anode Kit w/Hardware - Volvo SX - Aluminum
List Price: $49.99
Sale Price: $25.40
You Save: $24.59
Tecnoseal Anode Kit w/Hardware - Volvo 280 - Aluminum Tecnoseal R5 Rudder Anode - Zinc - 5" Diameter Tecnoseal Anode Kit w/Hardware - Volvo 290 - Magnesium
Tecnoseal Anode Kit w/Hardware - Volvo 280 - Aluminum
List Price: $46.99
Sale Price: $25.23
You Save: $21.76
Tecnoseal R5 Rudder Anode - Zinc - 5" Diameter
List Price: $42.99
Sale Price: $25.16
You Save: $17.83
Tecnoseal Anode Kit w/Hardware - Volvo 290 - Magnesium
List Price: $36.99
Sale Price: $25.15
You Save: $11.84
Tecnoseal Anode Kit w/Hardware - Volvo Duo-Prop 290 - Zinc Tecnoseal Anode Kit w/Hardware - Mercury Verado 6 - Aluminum Tecnoseal Anode Kit w/Hardware - Mercury Bravo 2-3 - Zinc
Tecnoseal Anode Kit w/Hardware - Volvo Duo-Prop 290 - Zinc
List Price: $39.99
Sale Price: $24.70
You Save: $15.29
Tecnoseal Anode Kit w/Hardware - Mercury Verado 6 - Aluminum
List Price: $72.99
Sale Price: $24.56
You Save: $48.43
Tecnoseal Anode Kit w/Hardware - Mercury Bravo 2-3 - Zinc
List Price: $39.99
Sale Price: $24.54
You Save: $15.45
ProMariner Heavy Duty Shaft Brush Tecnoseal Anode Kit w/Hardware - Volvo 290 - Zinc Tecnoseal Anode Kit - Volvo DPSA/SXA - Aluminum
ProMariner Heavy Duty Shaft Brush
List Price: $38.09
Sale Price: $24.35
You Save: $13.74
Tecnoseal Anode Kit w/Hardware - Volvo 290 - Zinc
List Price: $35.99
Sale Price: $24.04
You Save: $11.95
Tecnoseal Anode Kit - Volvo DPSA/SXA - Aluminum
List Price: $49.99
Sale Price: $23.95
You Save: $26.04
Tecnoseal Anode Kit w/Hardware - Volvo Duo-Prop 290 - Magnesium Tecnoseal Anode Kit w/Hardware - Volvo 280 - Magnesium Tecnoseal Anode Kit w/Hardware - Volvo Duo-Prop 280 - Aluminum
Tecnoseal Anode Kit w/Hardware - Volvo Duo-Prop 290 - Magnesium
List Price: $39.99
Sale Price: $23.18
You Save: $16.81
Tecnoseal Anode Kit w/Hardware - Volvo 280 - Magnesium
List Price: $44.99
Sale Price: $22.89
You Save: $22.10
Tecnoseal Anode Kit w/Hardware - Volvo Duo-Prop 280 - Aluminum
List Price: $44.99
Sale Price: $22.85
You Save: $22.14
Tecnoseal R5AL Rudder Anode - Aluminum - 5" Diameter Tecnoseal Anode Kit - Yamaha 200-250 HP - Magnesium Tecnoseal Anode Kit w/Hardware - Volvo Duo-Prop 280 - Magnesium
Tecnoseal R5AL Rudder Anode - Aluminum - 5" Diameter
List Price: $39.99
Sale Price: $22.74
You Save: $17.25
Tecnoseal Anode Kit - Yamaha 200-250 HP - Magnesium
List Price: $27.99
Sale Price: $22.64
You Save: $5.35
Tecnoseal Anode Kit w/Hardware - Volvo Duo-Prop 280 - Magnesium
List Price: $42.99
Sale Price: $22.26
You Save: $20.73
Tecnoseal Anode Kit w/Hardware - Volvo Duo-Prop 280 - Zinc Tecnoseal Anode Kit w/Hardware - Yamaha 200-300HP Hi-Performance - Zinc Tecnoseal Anode Kit w/Hardware - Mercury Verado 4 - Zinc
Tecnoseal Anode Kit w/Hardware - Volvo Duo-Prop 280 - Zinc
List Price: $42.99
Sale Price: $22.25
You Save: $20.74
Tecnoseal Anode Kit w/Hardware - Yamaha 200-300HP Hi-Performance - Zinc
List Price: $31.99
Sale Price: $22.16
You Save: $9.83
Tecnoseal Anode Kit w/Hardware - Mercury Verado 4 - Zinc
List Price: $36.99
Sale Price: $21.91
You Save: $15.08
Tecnoseal Anode Kit w/Hardware - Volvo 280 - Zinc Tecnoseal X9MG Shaft Anode - Magnesium - 2" Shaft Diameter Tecnoseal Anode Kit w/Hardware - Yamaha 200-250HP - Aluminum
Tecnoseal Anode Kit w/Hardware - Volvo 280 - Zinc
List Price: $42.99
Sale Price: $21.65
You Save: $21.34
Tecnoseal X9MG Shaft Anode - Magnesium - 2" Shaft Diameter
List Price: $39.99
Sale Price: $20.89
You Save: $19.10
Tecnoseal Anode Kit w/Hardware - Yamaha 200-250HP - Aluminum
List Price: $32.99
Sale Price: $20.70
You Save: $12.29
Tecnoseal Anode Kit w/Hardware - Volvo 290 - Aluminum Tecnoseal Anode Kit w/Hardware - Yamaha 150-200HP - Zinc Tecnoseal Anode Kit - Yamaha 200-250HP - Zinc
Tecnoseal Anode Kit w/Hardware - Volvo 290 - Aluminum
List Price: $32.99
Sale Price: $20.60
You Save: $12.39
Tecnoseal Anode Kit w/Hardware - Yamaha 150-200HP - Zinc
List Price: $29.99
Sale Price: $20.23
You Save: $9.76
Tecnoseal Anode Kit - Yamaha 200-250HP - Zinc
List Price: $29.99
Sale Price: $20.21
You Save: $9.78
Tecnoseal Anode Kit w/Hardware - Yamaha 150-200HP - Magnesium Tecnoseal TEC-N1 Downeaster Transom Anode - Zinc Tecnoseal X8MG Shaft Anode - Magnesium - 1-3/4" Shaft Diameter
Tecnoseal Anode Kit w/Hardware - Yamaha 150-200HP - Magnesium
List Price: $24.99
Sale Price: $19.39
You Save: $5.60
Tecnoseal TEC-N1 Downeaster Transom Anode - Zinc
List Price: $24.99
Sale Price: $19.18
You Save: $5.81
Tecnoseal X8MG Shaft Anode - Magnesium - 1-3/4" Shaft Diameter
List Price: $35.99
Sale Price: $18.96
You Save: $17.03
Tecnoseal Anode Kit w/Hardware - Yamaha 200-300HP Hi-Performance - Aluminum Tecnoseal X7MG Shaft Anode - Magnesium - 1-1/2" Shaft Diameter Tecnoseal Anode Kit w/Hardware - Volvo Duo-Prop 290 - Aluminum
Tecnoseal Anode Kit w/Hardware - Yamaha 200-300HP Hi-Performance - Aluminum
List Price: $32.99
Sale Price: $18.73
You Save: $14.26
Tecnoseal X7MG Shaft Anode - Magnesium - 1-1/2" Shaft Diameter
List Price: $34.99
Sale Price: $18.38
You Save: $16.61
Tecnoseal Anode Kit w/Hardware - Volvo Duo-Prop 290 - Aluminum
List Price: $32.99
Sale Price: $18.06
You Save: $14.93
Tecnoseal R3MG Rudder Anode - Magnesium - 3-3/4" Diameter Tecnoseal Anode Kit w/Hardware - Yamaha 150-200HP Left Hand Rotation - Aluminum Tecnoseal Anode Kit w/Hardware - Yamaha 150-200HP - Aluminum
Tecnoseal R3MG Rudder Anode - Magnesium - 3-3/4" Diameter
List Price: $39.99
Sale Price: $17.63
You Save: $22.36
Tecnoseal Anode Kit w/Hardware - Yamaha 150-200HP Left Hand Rotation - Aluminum
List Price: $29.99
Sale Price: $17.43
You Save: $12.56
Tecnoseal Anode Kit w/Hardware - Yamaha 150-200HP - Aluminum
List Price: $29.99
Sale Price: $17.43
You Save: $12.56
Tecnoseal X6MG Shaft Anode - Magnesium - 1-3/8" Shaft Diameter Tecnoseal Anode Kit - Volvo DPH/DPR - Aluminum Tecnoseal R4AL Rudder Anode - Aluminum - 5" Diameter
Tecnoseal X6MG Shaft Anode - Magnesium - 1-3/8" Shaft Diameter
List Price: $32.99
Sale Price: $16.76
You Save: $16.23
Tecnoseal Anode Kit - Volvo DPH/DPR - Aluminum
List Price: $39.99
Sale Price: $16.74
You Save: $23.25
Tecnoseal R4AL Rudder Anode - Aluminum - 5" Diameter
List Price: $28.99
Sale Price: $15.80
You Save: $13.19
Tecnoseal R4 Rudder Anode - Zinc - 5" Diameter ProMariner Shaft Brush Tecnoseal X9 Shaft Anode - Zinc - 2" Shaft Diameter
Tecnoseal R4 Rudder Anode - Zinc - 5" Diameter
List Price: $29.99
Sale Price: $15.65
You Save: $14.34
ProMariner Shaft Brush
List Price: $24.29
Sale Price: $15.51
You Save: $8.78
Tecnoseal X9 Shaft Anode - Zinc - 2" Shaft Diameter
List Price: $24.99
Sale Price: $15.45
You Save: $9.54
Tecnoseal X8AL Shaft Anode - Aluminum - 1-3/4" Shaft Diameter Tecnoseal Gimbal Block Anode - Zinc Finned Tecnoseal Cavitation Plate Anode - Magnesium - Alpha
Tecnoseal X8AL Shaft Anode - Aluminum - 1-3/4" Shaft Diameter
List Price: $24.99
Sale Price: $15.36
You Save: $9.63
Tecnoseal Gimbal Block Anode - Zinc Finned
List Price: $24.99
Sale Price: $14.76
You Save: $10.23
Tecnoseal Cavitation Plate Anode - Magnesium - Alpha
List Price: $25.99
Sale Price: $14.36
You Save: $11.63
Tecnoseal Transom Bar Anode - Zinc - Yamaha Tecnoseal Cavitation Plate Anode - Magnesium - Bravo Tecnoseal TEC-30 Hull Plate Anode - Zinc
Tecnoseal Transom Bar Anode - Zinc - Yamaha
List Price: $21.99
Sale Price: $14.26
You Save: $7.73
Tecnoseal Cavitation Plate Anode - Magnesium - Bravo
List Price: $23.99
Sale Price: $14.11
You Save: $9.88
Tecnoseal TEC-30 Hull Plate Anode - Zinc
List Price: $19.99
Sale Price: $14.09
You Save: $5.90
Tecnoseal X8 Shaft Anode - Zinc - 1-3/4" Shaft Diameter Tecnoseal Trim Tab Anode - Zinc - Yamaha SX Tecnoseal Trim Tab Anode - Zinc - Yamaha DX
Tecnoseal X8 Shaft Anode - Zinc - 1-3/4" Shaft Diameter
List Price: $24.99
Sale Price: $14.01
You Save: $10.98
Tecnoseal Trim Tab Anode - Zinc - Yamaha SX
List Price: $22.99
Sale Price: $13.91
You Save: $9.08
Tecnoseal Trim Tab Anode - Zinc - Yamaha DX
List Price: $24.99
Sale Price: $13.91
You Save: $11.08
Tecnoseal TEC-40 Hull Plate Anode - Zinc Tecnoseal X4MG Shaft Anode - Magnesium - 1-1/8" Shaft Diameter Tecnoseal X3MG Shaft Anode - Magnesium - 1" Shaft Diameter
Tecnoseal TEC-40 Hull Plate Anode - Zinc
List Price: $19.99
Sale Price: $13.81
You Save: $6.18
Tecnoseal X4MG Shaft Anode - Magnesium - 1-1/8" Shaft Diameter
List Price: $25.99
Sale Price: $13.68
You Save: $12.31
Tecnoseal X3MG Shaft Anode - Magnesium - 1" Shaft Diameter
List Price: $24.99
Sale Price: $13.29
You Save: $11.70
Tecnoseal Gimbal Block Anode - Zinc Tecnoseal X9AL Shaft Anode - Aluminum - 2" Shaft Diameter Tecnoseal Trim Tab Anode - Zinc - Yamaha 200-250
Tecnoseal Gimbal Block Anode - Zinc
List Price: $21.99
Sale Price: $13.26
You Save: $8.73
Tecnoseal X9AL Shaft Anode - Aluminum - 2" Shaft Diameter
List Price: $24.99
Sale Price: $13.26
You Save: $11.73
Tecnoseal Trim Tab Anode - Zinc - Yamaha 200-250
List Price: $18.99
Sale Price: $13.18
You Save: $5.81
Tecnoseal Gimbal Block Anode - Magnesium Tecnoseal Trim Tab Anode - Aluminum - Yamaha 200-250 Tecnoseal Outdrive Anode Plate - Zinc - Volvo SX
Tecnoseal Gimbal Block Anode - Magnesium
List Price: $22.99
Sale Price: $12.68
You Save: $10.31
Tecnoseal Trim Tab Anode - Aluminum - Yamaha 200-250
List Price: $22.99
Sale Price: $12.59
You Save: $10.40
Tecnoseal Outdrive Anode Plate - Zinc - Volvo SX
List Price: $19.99
Sale Price: $12.51
You Save: $7.48
Tecnoseal Transom Bar Anode - Aluminum - Yamaha Tecnoseal R2MG Rudder Anode - Magnesium - 2-13/16" Diameter Tecnoseal Cavitation Plate Anode - Zinc - Bravo
Tecnoseal Transom Bar Anode - Aluminum - Yamaha
List Price: $17.99
Sale Price: $12.10
You Save: $5.89
Tecnoseal R2MG Rudder Anode - Magnesium - 2-13/16" Diameter
List Price: $24.99
Sale Price: $11.74
You Save: $13.25
Tecnoseal Cavitation Plate Anode - Zinc - Bravo
List Price: $19.99
Sale Price: $11.59
You Save: $8.40
Tecnoseal TEC-30AL Hull Plate Anode - Aluminum Tecnoseal Cavitation Plate Anode - Aluminum - Bravo Tecnoseal Trim Plate Anode - Magnesium
Tecnoseal TEC-30AL Hull Plate Anode - Aluminum
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1

Anode Materials

There are three main metals used as galvanic anodes, magnesium, aluminium and zinc. They are all available as blocks, rods, plates or extruded ribbon. Each material has advantages and disadvantages.

Magnesium has the most negative electropotential of the three (see galvanic series) and is more suitable for areas where the electrolyte (soil or water) resistivity is higher. This is usually on-shore pipelines and other buried structures, although it is also used on boats in fresh water and in water heaters. In some cases, the negative potential of magnesium can be a disadvantage: if the potential of the protected metal becomes too negative, hydrogen ions may be evolved on the cathode surface leading to hydrogen embrittlement or to disbonding of the coating. Where this is a possibility, zinc anodes may be used.

Zinc and aluminum are generally used in salt water, where the resistivity is generally lower. Typical uses are for the hulls of ships and boats, offshore pipelines and production platforms, in salt-water-cooled marine engines, on small boat propellers and rudders, and for the internal surface of storage tanks.

Zinc is considered a reliable material, but is not suitable for use at higher temperatures, as it tends to passivate (becomes less negative); if this happens, current may cease to flow and the anode stops working.

Zinc has a relatively low driving voltage, which means in higher-resistivity soils or water it may not be able to provide sufficient current. However, in some circumstances — where there is a risk of hydrogen embrittlement, for example — this lower voltage is advantageous, as over-protection is avoided.

Aluminum anodes have several advantages, such as a lighter weight, and much higher capacity than zinc. However, their electrochemical behavior is not considered as reliable as zinc, and greater care must be taken in how they are used. Aluminum anodes will passivate where chloride concentration is below 1,446 parts per million.

One disadvantage of aluminium is that if it strikes a rusty surface, a large thermite spark may be generated, therefore its use is restricted in tanks where there may be explosive atmospheres and there is a risk of the anode falling.

Since the operation of a galvanic anode relies on the difference in electropotential between the anode and the cathode, practically any metal can be used to protect some other, providing there is a sufficient difference in potential. For example, iron anodes can be used to protect copper.

Design considerations

The design of a galvanic anode CP system should consider many factors, including the type of structure, the resistivity of the electrolyte (soil or water) it will operate in, the type of coating and the service life.

The primary calculation is how much anode material will be required to protect the structure for the required time. Too little material may provide protection for a while, but need to be replaced regularly. Too much material would provide protection at an unnecessary cost. The mass in kg is given by equation

Mass =(Current Required x Design Life x 8760) ÷ (Utilisation Factor x Anode Capacity)
  • The design life is in years (1 year = 8760 hours).
  • The utilisation factor (UF) of the anode is a constant value, depending on the shape of the anode and how it is attached, which signifies how much of the anode can be consumed before it ceases to be effective. A value of 0.8 indicates that 80% of the anode can be consumed, before it should be replaced. A long slender stand off anode (installed on legs to keep the anode away from the structure) has a UF value of 0.9, whereas the UF of a short, flush mounted anode is 0.8.
  • Anode capacity is an indication of how much material is consumed as current flows over time. The value for zinc in seawater is 780 Ah/kg but aluminium is 2000 Ah/kg, which means that, in theory, aluminium can produce much more current than zinc before being depleted and this is one of the factors to consider when choosing a particular material.

The amount of current required corresponds directly to the surface area of the metal exposed to the soil or water, so the application of a coating drastically reduces the mass of anode material required. The better the coating, the less anode material is needed.

Once the mass of material is known, the particular type of anode is chosen. Differently shaped anodes will have a different resistance to earth, which governs how much current can be produced, so the resistance of the anode is calculated to ensure that sufficient current will be available. If the resistance of the anode is too high, either a differently shaped or sized anode is chosen, or a greater quantity of anodes must be used.

The arrangement of the anodes is then planned so as to provide an even distribution of current over the whole structure. For example, if a particular design shows that a pipeline 10 kilometers (6.2 mi) long needs 10 anodes, then approximately one anode per kilometer would be more effective than putting all 10 anodes at one end or in the center.

Advantages and disadvantages of galvanic cathode protection

Advantages

  • No external power sources required.
  • Relatively easy to install.
  • Lower voltages and current mean that risk of causing stray current interference on other structures is low.
  • Require less frequent monitoring than impressed current CP systems.
  • Relatively low risk of over-protection.
  • Once installed, testing the system components is relatively simple for trained personnel.

Disadvantages

  • Current capacity limited by anode mass and self consumption at low current density.
  • Lower driving voltage means the anodes may not work in high-resistivity environments.
  • Often require that structure be electrically isolated from other structures and ground.
  • Anodes are heavy and will increase water resistance on moving structures or pipe interiors.
  • Where D.C. power is available, electrical energy can be obtained more cheaply than by galvanic anodes.
  • Where large arrays are used wiring is needed due to high current flow and need to keep resistance losses low.
  • Anodes must be carefully placed to avoid in interfering with water flow into the propeller.

Cost effectiveness

As the anode materials used are generally more costly than iron, using this method to protect ferrous metal structures may not appear to be particularly cost effective. However, consideration should also be given to the costs incurred by removing a ship from the water, for example, to repair a corroded hull or to replace a steel pipeline or tank because their structural integrity has been compromised by corrosion.

However there is a limit to the cost effectiveness of a galvanic system. On larger structures, or long pipelines, so many anodes may be needed that it would be more cost-effective to install impressed current cathodic protection.

*Content use permission from Wikipedia.com