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Zinc Verse Aluminum Anodes

 Here is a comparison of Zinc verse Aluminum anodes, 

We get the questions a lot , "Which is better"  

Well it all depends on a lot of factors , price per pounds / Amperage/ water type. Look over the chart, and then you can compare but you need to also remember to divide the estimated life of the anode /   by price  

 

 

 

Performance - Aluminum & Zinc Anodes

SPECIFICATIONSZINC ANODES U.S. Military Specification MIL-A-18001ALUMINUM ANODES U.S. Military Specification MIL-A-24779
CAPACITY, Amp hr/lb 355 1225

EFFICIENCY

95%

94%

CONSUMPTION, Amp lb/yr 24.5 Lbs 7.6 Lbs
POTENTIAL reference Cu/CuSO4 -1050mV -1100mV

Composition - Aluminum & Zinc Anodes

COMPOSITIONZINC ANODES U.S. Military Specification MIL-A-18001ALUMINUM ANODES U.S. Military Specification MIL-A-24779
Cadmium 0.025 - 0.07% -
Copper 0.005% Max. 0.004% Max.
Iron 0.005% Max. 0.090% Max.
Indium - 0.014% - 0.020%
Lead 0.006% Max. -
Mercury - 0.001% Max.
Silicon - 0.08% - 0.20%
Aluminum 0.1% - 0.5% Remainder
Zinc Remainder 4.0% - 6.5%

Comparison between Aluminum & Zinc Anodes

ZINC ANODES U.S. Military Specification MIL-A-18001ALUMINUM ANODES U.S. Military Specification MIL-A-24779
355 Amp hr/lb 1225 Amp hr/lb
This means a Zinc anode will give 1 amp for every 355 hours for every pound of Zinc This means an Aluminum anode will give 1 amp for every 1225 hours for every pound of Aluminum
Take a typical Z3 anode (weight=11 lbs), it would have a total ampere hours of 3905 Take a typical A3 anode (weight = 5 lbs), it would have a total ampere hours of 6125
Assuming the anode performs at 0.5 amp Assuming the anode performs at 0.5 amp
This anode will last for 7810 hours This anode will last for 12250 hours
Which is 325 days or 10.5 months Which is 510 days or 16.5 months