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Martyr Magnesium Streamlined Shaft Anode Customer Questions and Answers

2 of 2 Questions

Question

I am replacing my shaft anode on a fresh water sailboat. What metal provides the best protection, Al or Mg?

Asked on 03/26/2018 by Garry from Sylvania, OH

Top Answer

For fresh water, we recommend magnesium. If you are in brackish you may want aluminum.

Answered on 05/31/2018 by JD Tech Associate
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Answer

Definitely Magnesium. They will offer more protection in fresh water than aluminum.

Answered on 03/26/2018 by lucid484

Answer

Looking at the galvanic table, magnesium is the least noble metal and there for should provide the most protection. I had a zinc anode for 4 years prior to last year when I installed a magnesium anode. The magnesium anode had corroded in one year as much as the zinc did in 4 years.

Answered on 03/27/2018 by crotunn1

Answer

In fresh water, Magnesium is recommended because it is less noble than Aluminum. I saltwater, use Al.

Answered on 03/27/2018 by jms707

Answer

Not an expert but Mg has been working for me.

Answered on 03/29/2018 by mahoney195
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Question

Does it matter if the anode is on the shaft in the bilge, or must it be in the water? tom ray

Asked on 01/18/2015 by Thomas H Ray

Top Answer

For the anode to work it needs to be exposed to an electrolyte. So yes it must be in the water.

Answered on 01/18/2015 by JOHN ERIDON
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Answer

Needs to be in water.

Answered on 01/18/2015 by JAMES RUSSELL

Answer

Thanks John. I thought so, but needed some professional comments.

Answered on 01/19/2015 by Thomas H Ray

Answer

Anodes must be in the water. Shaft anodes are installed near the strut. The anode protects submerged metal parts on your boat from corrosion. From Wikipedia: "They are made from a metal alloy with a more "active" voltage (more negative reduction potential / more positive electrochemical potential) than the metal of the structure. 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." For more information, I suggest you Google "How to install anodes on a boat."

Answered on 01/18/2015 by HALDON SWINEHART
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