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Standard Potential (H1) Magnesium anode
- May 08, 2017 -

High Potential (HP) Cast Magnesium anode is the best choice for CP systems in high resistivity soil, while Normal Potential (H1) Magnesium anode is the best choice for CP systems in low resistivity soil.

Typically, Normal Potential (H1) Magnesium anodes produce a minimum open circuit potential of 1.52 volts with respect to CuCuSO4. Therefore, the driving potential of the H-1 cathodic protection anodes exceeds that of aluminum or zinc, but is still lower than a high potential magnesium anode.

At Farwest Corrosion, we attach a copper lead wire (size, length and insulation type as specified) to the H-1 anode and seal the connection interface. If required, the H-1 anode will be packaged in a cloth bag with prepared backfill mixture of 75% gypsum, 20% bentonite and 5% sodium sulfate. The backfill mixture works to maintain moisture around the anode and lowers the anode to earth resistance. The packaged anodes are shipped on pallets in plastic bags that must be removed prior to installation.

 

Chemical composition of H1 Mg anode, 

Alloy

Al

Zn

Mn

Si

(max)

Cu
  (max)

Ni
  (max)

Fe

(max)

Total   of Impurities

(max)

Mg

AZ63B

5.30-6.70

2.50-3.50

0.15-0.70

0.10

0.02

0.002

0.003

0.30

Bal.