In average soil conditions, H-1 alloy, commonly known as standard potential magnesium, is an excellent choice in cathodic protection systems. Typically, CorrTech H-1 anodes produce a minimum open circuit potential of 1.52 volts with respect to Cu-CuSO4. 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.
Chemical composition%
| Alloy | Al | Zn | Mn | Si (max) | Cu (max) | Ni (max) | Fe (max) | Total of Impurities (max) |
| AZ63B | 5.30-6.70 | 2.50-3.50 | 0.15-0.60 | 0.08 | 0.01 | 0.001 | 0.003 | 0.30 |
| AZ31D | 2.5-3.5 | 0.6-1.4 | 0.2-1.0 | 0.08 | 0.01 | 0.001 | 0.002 | 0.30 |
| AZ63C | 5.30-6.70 | 2.50-3.50 | 0.15-0.70 | 0.30 | 0.05 | 0.003 | 0.003 | 0.30 |
Electrochemical properties
| Open voltage(-V) | Closed voltage(-V) | Actual capacity(A.h/kg) | Efficiency (%) |
| 1.50-1.55 | 1.45-1.50 | 1,230 min | 55 min |
MSN