Quality Substrate Material
Our magnesium anode is manufactured under the ASTM B843-M1C standard for high potential or ASTM B843-AZ63B standard for standard potential, according to the following composition:
| Element | High Potential (ASTM B843 – M1C) | Standard Potential (ASTM B843 – AZ63B) |
| Aluminum (Al) | 0.01% | 5.3 – 6.7% |
| Manganese (Mn) | 0.5 – 1.3% | 0.15 – 0.7% |
| Zinc (Zn) | — | 2.5 – 3.5% |
| Silicon (Si) | 0.05% | 0.1% |
| Copper (Cu) | 0.02% | 0.02% |
| Nickel (Ni) | 0.001% | 0.002% |
| Iron (Fe) | 0.03% | 0.003% |
| Other Each | 0.05% | — |
| Others Total | 0.3% | 0.3% |
| Magnesium (Mg) | Remainder | Remainder |
Different Electro-potential Options
There are two common cast magnesium anode available:
1. Standard Magnesium Alloy Anode
A standard potential anode has a nominal corrosion potential of -1.55 volts (relative to a Cu/CuSO4 reference electrode). It is ideal for soil conditions where resistivity is under 20 Ω·cm.
2. High Potential Magnesium Alloy Anode
High potential magnesium anodes have higher open circuit voltage and driving potential. It produces an open circuit potential of negative 1.7~1.75 volts, which is 20~30% greater than is typically found with conventional magnesium anodes. This yields more current output and achieves a greater efficiency; reaching a sufficient cathodic protection level whilst maintaining a lower consumption of the anodes. They are ideally suited for structures buried in soils with resistivities exceeding 2,000 Ω·cm, or for structures containing numerous corrosion clusters.
| Technical Measurement | High Potential | Standard Potential |
| Open Circuit Potential (-V) | 1.7 ~ 1.75 | 1.5 ~ 1.55 |
| Close Circuit Potential (-V) | 1.58 ~ 1.62 | 1.45 ~ 1.50 |
| Min. Current Capacity | 500 A.h/lbs (1100 A.h/kg) | 550 A.h/lbs (1230 A.h/kg) |
| Min. Current Efficiency | 50% | 55% |
Remarks: Open/close circuit potential is with respect to a Saturated Calomel Reference Electrode.
Strict Quality Control
By conforming to ISO 9001:2015 standards, our anodes are manufactured, inspected, and tested in accordance with the most stringent quality control procedures to ensure peak performance.
Customized Configurations
Standard sizes below are available at Jennings Anodes warehouse. Other sizes are available upon request.
| Item No. | Anode Dimensions ( ØD x L ) | Insert Dimensions | Prepackaged Size | Weight | ||||
| High Potential | Standard Potential | Wc | T | Diameter | Length | Bare | Prepackaged | |
| JA-MG-R50 | 4.5” x 11.3” (114 x 288 mm) | 4.5” x 10.8” (114 x 275 mm) | 1.0” (25 mm) | 0.08” (2 mm) | 6.3” (160 mm) | 18.9” (480 mm) | 11 lbs (5 kg) | 29.8 lbs (13.5 kg) |
| JA-MG-R77 | 4.5” x 17.3” (114 x 440 mm) | 4.5” x 16.1” (114 x 410 mm) | 1.0” (25 mm) | 0.08” (2 mm) | 6.9” (175 mm) | 25.2” (640 mm) | 17 lbs (7.7 kg) | 48.5 lbs (22 kg) |
| JA-MG-R100 | 4.5” x 22.2” (114 x 565 mm) | 4.5” x 21.5” (114 x 545 mm) | 1.0” (25 mm) | 0.08” (2 mm) | 6.9” (175 mm) | 28.0” (710 mm) | 22 lbs (10 kg) | 55.1 lbs (25 kg) |
| JA-MG-R145 | 5.75” x 19.9” (146 x 505 mm) | 5.75” x 18.7” (146 x 475 mm) | 1.0” (25 mm) | 0.08” (2 mm) | 7.9” (200 mm) | 25.6” (650 mm) | 32 lbs (14.5 kg) | 66.1 lbs (30 kg) |
| JA-MG-R273 | 4.5” x 60” (114 x 1524 mm) | 4.5” x 57.1” (114 x 1450 mm) | 1.0” (25 mm) | 0.08” (2 mm) | 6.9” (175 mm) | 65.0” (1650 mm) | 60 lbs (27.3 kg) | 127.9 lbs (58 kg) |
