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Magnesium Anode Rods for Cathodic Protection by Farwest Corrosion

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
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