Magnesium anodes for soil and freshwater cathodic protection, manufactured in accordance with ASTM B843. These anodes provide reliable driving potential and consistent electrochemical performance for buried and freshwater-exposed steel structures.
GESIT Magnesium Anodes deliver high driving voltage and are specifically engineered for freshwater and soil environments—conditions where aluminium and zinc anodes cannot provide adequate potential. With a typical closed-circuit potential of –1.70 to –1.75 V (High Potential / HP) and –1.50 to –1.55 V (Standard Potential / SP) versus Cu/CuSO₄ electrodes, magnesium is the preferred sacrificial anode material for low-conductivity applications.
Manufactured in accordance with ASTM B843 and produced using controlled alloy chemistry under strict QA/QC procedures, GESIT Magnesium Anodes ensure stable and reliable electrochemical performance for buried pipelines, storage tanks, foundations, and freshwater-exposed structures. Trusted by pipeline operators, EPC companies, industrial plants, water utility providers, and infrastructure owners, GESIT offers magnesium anodes that are fully customizable in weight, size, backfill type, and core configuration.
If your project requires sacrificial anodes for soil or freshwater cathodic protection systems, GESIT provides complete magnesium anode solutions—covering selection, engineering design, supply, and technical support.
Very high driving potential compared to Zinc or Aluminium Anodes:
Electrochemical capacity: typically ≈ 1,100–1,250 Ah/kg (depending on alloy and manufacturing).
Ideal for: structures in freshwater, buried pipelines, underground tanks and high-resistivity soils.
Not recommended for: seawater and brackish environments (excessive driving potential leads to rapid consumption / risk of over-protection).
Supply options: bare anode, pre-packaged with backfill, ribbon format, or custom bracelet/block/slender shapes.
GESIT supplies both alloy types across all product categories:
1. High-Potential Magnesium Anode (HP)
2. Standard-Potential Magnesium Anode (SP)
| Property | High Potential (M1C) | Standard Potential (AZ63B) |
|---|---|---|
| Open Circuit Potential | –1.70 to –1.75 V (Cu/CuSO₄) | –1.50 to –1.55 V (Cu/CuSO₄) |
| Closed Circuit Potential | –1.58 to –1.62 V (Cu/CuSO₄) | –1.45 to –1.50 V (Cu/CuSO₄) |
| Electrochemical Capacity | 1,100 Ah/kg | 1,200–1,230 Ah/kg |
| Current Efficiency | 50% minimum | 55% minimum |
| Ideal Applications | High-resistivity soils (>2,000 Ω·cm) | Medium-resistivity soils (<20 Ω·cm) |
High Potential Alloy (ASTM B843–M1C)
| Element | Content |
|---|---|
| Aluminum (Al) | 0.01% max |
| Manganese (Mn) | 0.50–1.30% |
| Copper (Cu) | 0.02% max |
| Silicon (Si) | 0.05% max |
| Iron (Fe) | 0.03% max |
| Nickel (Ni) | 0.001% max |
| Zinc (Zn) | — |
| Single Impurity (each) | 0.05% max |
| Total Impurities | 0.30% max |
| Magnesium (Mg) | Remainder |
Standard Potential Alloy (ASTM B843–AZ63B)
| Element | Content |
|---|---|
| Aluminum (Al) | 5.30–6.70% |
| Manganese (Mn) | 0.15–0.70% |
| Zinc (Zn) | 2.50–3.50% |
| Copper (Cu) | 0.02% max |
| Silicon (Si) | 0.10% max |
| Iron (Fe) | 0.003% max |
| Nickel (Ni) | 0.002% max |
| Single Impurity (each) | 0.05% max |
| Total Impurities | 0.30% max |
| Magnesium (Mg) | Remainder |
Bare magnesium anode encased in engineered backfill (gypsum–bentonite–sodium sulfate) to reduce soil resistance and stabilize consumption.
Available in: High Potential (HP) or Standard (SP) magnesium alloy.
Typical Net Weight:
3 lb (1,4 kg), 5 lb (2,3 kg), 9 lb (4,1 kg), 17 lb (7,7 kg), 20 lb (9,1 kg), 32 lb (14,5 kg), 40 lb (18,1 kg), 48 lb (21,8 kg), dan 60 lb (27,2 kg).
Cable Option:
GESIT provides a wide range of cable tail configurations for pre-packaged magnesium anodes, available in various insulation and armored or non-armored types such as XLPE/PVC, XLPE/AWA/PVC, XLPE/SWA/PVC, and HMWPE. Cable tails can be supplied in multiple AWG or metric sizes, customized according to project requirements and installation conditions.
Magnesium Long Slender Anodes (MLSA) are manufactured in accordance with ASTM B843 and designed for extended-length installation in freshwater. MLSA can be produced in two configurations:
Cast magnesium alloy in a trapezoidal long-slender shape, or
Magnesium condenser blocks assembled using engineered brackets to form a continuous long-slender anode.
Both manufacturing methods allow flexibility in geometry, length, and core/mounting configuration, and are available in either High Potential (HP) or Standard Potential (SP) magnesium alloys.
MLSA is used for structures in freshwater environments such as:
Magnesium Ribbon Anode is an extruded magnesium ribbon with a continuous galvanized steel core, manufactured strictly to ASTM B843 M1C alloy requirements. Its high driving potential (≈ –1.70 to –1.75 V vs SCE) and large surface-area-to-weight ratio provide efficient and uniform current distribution over long distances.
