MG Duff Bolt On Magnesium Anodes

Category

Price

MD55

MD55 Magnesium Disc Anode 229mm Diameter 2.25kg

Original price was: £92.18.Current price is: £74.99. (ex. VAT)
MD56 Magnesium Disc Anode 0.3kg 100mm Diameter

MD56 Magnesium Disc Anode 100mm Diameter 0.3kg

Original price was: £25.66.Current price is: £12.49. (ex. VAT)
ZD59/MD59 Disc Anode (Pair) With Bolt 71mm Diameter

MD59 Magnesium Disc Anode (Pair) With Bolt 70mm Diameter

Original price was: £43.89.Current price is: £20.83. (ex. VAT)
MD72B 3.5kg Magnesium Bolt On Hull Anode

MD72B 3.5kg Magnesium Bolt On Hull Anode

Original price was: £184.41.Current price is: £104.16. (ex. VAT)
MD76 0.4kg Magnesium Bolt On Hull Anode

MD76 0.3kg Magnesium Bolt On Hull Anode

Original price was: £18.00.Current price is: £16.66. (ex. VAT)
MD77 0.7kg Magnesium Bolt On Hull Anode

MD77 0.7kg Magnesium Bolt On Hull Anode

Original price was: £32.86.Current price is: £29.16. (ex. VAT)
MD78B 1.3kg Magnesium Bolt On Hull Anode

MD78B 1.3kg Magnesium Bolt On Hull Anode

Original price was: £57.10.Current price is: £49.99. (ex. VAT)
MD79 1.0kg Magnesium Bolt On Hull Anode

MD79 1.0kg Magnesium Bolt On Hull Anode

Original price was: £49.00.Current price is: £45.83. (ex. VAT)

The common anode for fresh water is Magnesium.

The reason why Magnesium anodes work better than Zinc or Aluminum in fresh water has to do with the higher driving voltage available when using Magnesium anodes.

Fresh water is much less conductive to flow of ionic current. It has notably higher resistivity than salt water.

Thus, the higher driving voltage of Magnesium is able to deliver more current than Zinc.

In other words, it is easier to overcome the resistance of the current path in fresh water with Magnesium anodes than with the same size, shape, and number of Zinc anodes.

Furthermore, with Zinc anodes there is a risk of potential reversal at elevated temperatures in certain waters.

With Aluminum anodes, there is a risk of “passivation” in fresh waters. If the driving voltage is adversely reduced, insufficient current will be delivered for complete cathodic protection.