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
|
Magnesium Anode Rod Sizes
Anode rods are available in a number of standard diameters (see below) and rods can be produced up to 25 feet in length. A galvanized steel core is embedded lengthwise in the center of the anode rod allowing a reliable electrical connection to the anode rod.
Identification
Number
|
Nominal diameter
in inches
|
Core wire diameter
in inches
|
Approximate weight
per lineal foot
|
COR-500
|
.500
|
0.135
|
0.180
|
COR-840
|
0.840
|
0.135
|
0.456
|
COR-1050
|
1.050
|
0.135
|
0.684
|
COR-1315
|
1.315
|
0.135
|
1.068
|
COR-1561
|
1.561
|
0.188
|
1.500
|
COR-2024
|
2.024
|
0.188
|
2.500
|
COR-2562
|
2.562
|
0.188
|
4.000
|
COR-325
|
3.250
|
0.188
|
5.50
|
Anode Configurations
A positive electrical connection must be established and maintained between the anode core and the structure to be protected. To facilitate this, anode rods can be custom manufactured and supplied in a number of configurations depending on the application. These include:
-
Rods cut to a specified length with one or both ends saw cut (plain)
-
Rods cut to a specified length with the core wire exposed to a specified length on one or both ends
-
Rods provided with a hex-head threaded steel mounting cap on one end
-
Rods provided with a cable lead for attachment to structure
-
Rods cut to short sections and linked together with a flexible connector
Anode Caps:
As described above, magnesium anode rods can be supplied with a hex-head threaded steel mounting cap in the following size configurations:
Anode Diameter
|
Anode Length
|
Threaded Plug Size
|
|
0.840"
|
As Required
|
3/4" NPT
|
|
1.050"
|
As Required
|
1" NPT
|
|
1.315"
|
As Required
|
1-1/4" NPT
|
|
2.024"
|
As Required
|
2" NPT
|
Drive-in Anodes:
Magnesium anode rods can be manufactured for soil applications where the anode is driven into the soil. Commonly called "Drive-In Anodes", a cable is attached to the threaded steel cap described above. The opposite end of the anode is machined to either a 45 degree cut or pencil tip to simplify driving the anode into the soil. A stainless steel clamp is provided on the anode lead wire so the anode can be electrically connected to a structure, such as a pipe service riser.
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Manufacture materials for the repair and protection of reinforced concrete, masonry and rendered surfaces. Products include conductive coating anodes, primary anodes, reference electrodes and mesh anode overlays . Manufacture cathodic protection anodes and sputtering targets. Manufactures anodes, used world-wide as components in impressed current cathodic protection systems for corrosion control of metal structures.
Manufacture materials for the repair and protection of reinforced concrete, masonry and rendered surfaces. Products include conductive coating anodes, primary anodes, reference electrodes and mesh anode overlays . Manufacture cathodic protection anodes and sputtering targets. Manufactures anodes, used world-wide as components in impressed current cathodic protection systems for corrosion control of metal structures.
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