Magnesium rod anodes are used in a variety of ways to prevent corrosion on metallic structures of many kinds. These uses include:
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 %
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.
|Core wire diameter
per lineal foot
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:
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", there are variations to these anodes as follows:
The opposite end of the anode that is driven into the ground, can be provided in one of two ways:
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.