Magnesium Anode Rods for Cathodic Protection by Farwest Corrosion

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Magnesium rod anodes are used in a variety of ways to prevent corrosion on metallic structures of many kinds. These uses include:

Water reservoirs and tanks
Water heaters
Gas or water service entrance piping
Steel structures in high resistivity electrolyte

These anodes types are quite versatile and can be configured in many ways, depending on the application, and can offer installation convenience for the user.

Magnesium Anode Rod Alloys

There are two alloys available; the ProMag standard potential alloy and the UltraMag high potential alloy. The voltage potential of the ProMag is approximately -1.4 to 1.5 volts whereas the voltage potential of the UltraMag alloy is approximately -1.6 to -1.7 volts (with respect to a copper-copper sulfate reference).

Material	Mg %	Al %	Mn %	Zn %	Cu % max	Ni % max	Fe % max	Other imp. % max
Material	Mg %	Al %	Mn %	Zn %	Cu % max	Ni % max	Fe % max	each	total
ProMag Alloy	Bal.	2.5- 3.5	0.20 min	0.7- 1.3	0.01	0.001	0.002	0.05	0.30
UltraMag Alloy	Bal.	0.010 max	0.50- 1.3	-	0.02	0.001	0.03	0.05	0.30